0001262823-26-000016 | 10-K | XBRL Viewer

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Employee Benefits (Schedule Of Fair Value Of Pension Plan Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 285	$ 417
United States \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	57	82
United States \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	228	335
United States \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	387	378
Foreign Plan \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	4
Foreign Plan \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	374	367
Foreign Plan \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	7
Pension Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	285	417	$ 427
Pension Plan \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	387	378	$ 391
Cash and Cash Equivalents \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and Cash Equivalents \| United States \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and Cash Equivalents \| United States \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and Cash Equivalents \| United States \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and Cash Equivalents \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	4
Cash and Cash Equivalents \| Foreign Plan \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	4
Cash and Cash Equivalents \| Foreign Plan \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash and Cash Equivalents \| Foreign Plan \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Large-Cap Mutual Funds \| Equity Securities \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	97	143
Large-Cap Mutual Funds \| Equity Securities \| United States \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21	31
Large-Cap Mutual Funds \| Equity Securities \| United States \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	76	112
Large-Cap Mutual Funds \| Equity Securities \| United States \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Large-Cap Mutual Funds \| Equity Securities \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	1
Large-Cap Mutual Funds \| Equity Securities \| Foreign Plan \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Large-Cap Mutual Funds \| Equity Securities \| Foreign Plan \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	1
Large-Cap Mutual Funds \| Equity Securities \| Foreign Plan \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Small-Cap Mutual Funds \| Equity Securities \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	9
Small-Cap Mutual Funds \| Equity Securities \| United States \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Small-Cap Mutual Funds \| Equity Securities \| United States \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	9
Small-Cap Mutual Funds \| Equity Securities \| United States \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Small-Cap Mutual Funds \| Equity Securities \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Small-Cap Mutual Funds \| Equity Securities \| Foreign Plan \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Small-Cap Mutual Funds \| Equity Securities \| Foreign Plan \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Small-Cap Mutual Funds \| Equity Securities \| Foreign Plan \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International Mutual Funds \| Equity Securities \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43	61
International Mutual Funds \| Equity Securities \| United States \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29	41
International Mutual Funds \| Equity Securities \| United States \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	20
International Mutual Funds \| Equity Securities \| United States \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International Mutual Funds \| Equity Securities \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	76	74
International Mutual Funds \| Equity Securities \| Foreign Plan \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
International Mutual Funds \| Equity Securities \| Foreign Plan \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	76	74
International Mutual Funds \| Equity Securities \| Foreign Plan \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Bond Mutual Funds \| Fixed Income \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	131	191
Bond Mutual Funds \| Fixed Income \| United States \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	10
Bond Mutual Funds \| Fixed Income \| United States \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	124	181
Bond Mutual Funds \| Fixed Income \| United States \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Bond Mutual Funds \| Fixed Income \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	296	292
Bond Mutual Funds \| Fixed Income \| Foreign Plan \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Bond Mutual Funds \| Fixed Income \| Foreign Plan \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	296	292
Bond Mutual Funds \| Fixed Income \| Foreign Plan \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Short Term Investment Funds \| Fixed Income \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	13
Short Term Investment Funds \| Fixed Income \| United States \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Short Term Investment Funds \| Fixed Income \| United States \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	13
Short Term Investment Funds \| Fixed Income \| United States \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Short Term Investment Funds \| Fixed Income \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Short Term Investment Funds \| Fixed Income \| Foreign Plan \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Short Term Investment Funds \| Fixed Income \| Foreign Plan \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Short Term Investment Funds \| Fixed Income \| Foreign Plan \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Group Insurance Policy \| Fixed Income \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Group Insurance Policy \| Fixed Income \| United States \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Group Insurance Policy \| Fixed Income \| United States \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Group Insurance Policy \| Fixed Income \| United States \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Group Insurance Policy \| Fixed Income \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	7
Group Insurance Policy \| Fixed Income \| Foreign Plan \| Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Group Insurance Policy \| Fixed Income \| Foreign Plan \| Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Group Insurance Policy \| Fixed Income \| Foreign Plan \| Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 7	$ 7

Earnings and Dividends per Share (Dividends Per Share) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings and Dividends Per Share [Abstract]
Dividends Per Common Share (in dollars per share)	$ 2.1100	$ 2.0500	$ 1.7140

Employee Benefits (Narrative Defined Benefit Plan) (Details) - USD ($) $ in Millions	11 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2025
Defined Benefit Plan Disclosure [Line Items]
Expected net loss, Next Fiscal Year		$ (1)
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year		$ (7)
United States
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Long-Term		55.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Short-Term		45.00%
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 10
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 5
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Discretionary Range		20.00%
Minimum \| United States
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded Status, Percentage		80.00%
Minimum \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Discretionary Range	0.00%
Maximum \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Allocation Percentage of Assets, Discretionary Range	100.00%
Equity Securities \| United States
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		55.00%
Equity Securities \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		20.00%
Fixed Income \| United States
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		45.00%
Fixed Income \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		80.00%

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2025

Share-Based Payment Arrangement [Abstract]

Schedule Of Option Activity And Changes

Option activity and changes during the year ended December 31, 2025 were as follows:


	Options	Weighted Average Exercise Price		Weighted Average Remaining Term (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2024	1,088,507	$	96.31
Granted	260,834	110.15
Exercised	(85,492)	45.06
Cancelled	(48,592)	120.57
Outstanding at December 31, 2025	1,215,257	$	101.91	6.0	$	2
Exercisable at December 31, 2025	829,130	$	93.10	4.7	$	2

Schedule Of Range Of Exercise Prices For Outstanding Options

For options outstanding at December 31, 2025, the options had the following range of exercise prices:


Range of Prices	Options Outstanding	Weighted Average Remaining Contractual Life (Years)
$44.42 - $65.81	242,037	3.1
$79.83 - $86.54	219,531	4.3
$107.75 - $108.12	208,932	5.0
$110.15 - $110.15	233,222	9.1
$122.65 - $144.49	311,535	7.6

Schedule Of Weighted Average Value And Assumptions For Fair Value Of Options

The Company used the Black-Scholes option pricing model to value its options. The table below presents the weighted average value and assumptions used in determining each option's fair value. Volatility was calculated using historical trends of the Company's common stock price.


	Stock Option Grants
	Year Ended December 31,
	2025			2024			2023
Weighted average fair value	$	36.52		$	52.17		$	44.91
Risk-free interest rate	4.3		%	4.3		%	4.0		%
Expected life in years	5			5			5
Expected volatility	37.3		%	38.4		%	39.1		%
Expected dividend yield	1.9		%	1.2		%	1.1		%

Schedule Of Non-Vested Restricted Stock Award Activity And Changes

Non-vested restricted stock units as of December 31, 2025 and changes during the year ended December 31, 2025 were as follows:


	Number of Units	Weighted Average Grant Date Fair Value
Nov-vested at December 31, 2024	591,204	$	121.70
Granted	290,064	104.31
Vested	(210,522)	104.57
Forfeited	(63,299)	120.30
Nov-vested at December 31, 2025	607,447	$	119.35

Share-based Payment Arrangement, Performance Shares, Activity

Non-vested performance stock units as of December 31, 2025 and changes during the year ended December 31, 2025 were as follows:


	Number of Units	Weighted Average Grant Date Fair Value
Nov-vested at December 31, 2024	186,482	$	166.47
Granted	86,723	118.12
Vested	(61,314)	147.98
Forfeited	(19,782)	149.67
Nov-vested at December 31, 2025	192,109	$	152.27

Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions

The table below presents the assumptions used in determining grant date fair value. Volatility was calculated using historical trends of the Company's common stock price.


	Performance Stock Units
	Year Ended December 31,
	2025			2024			2023
Risk-free interest rate	4.2		%	4.5		%	4.4		%
Expected life in years	2.86			2.88			2.87
Expected volatility of Westlake Corporation common stock	31.6		%	33.8		%	40.8		%
Expected volatility of peer companies	24.7% - 53.2%			25.9% - 46.4%			26.6% - 53.2%
Average correlation coefficient of peer companies	0.58			0.60			0.61
Grant date fair value	$	118.12		$	183.39		$	167.76

Stock-Based Compensation (Schedule Of Non-Vested Restricted Stock Units and Performance Stock Units) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Restricted Stock Units (RSUs)
Number of Shares
Number of Shares, Non-vested, beginning balance	591,204
Number of Shares, Granted	290,064
Number of Shares, Vested	(210,522)
Number of Shares, Forfeited	(63,299)
Number of Shares, Non-vested, ending balance	607,447	591,204
Weighted Average Grant Date Fair Value
Weighted Average Fair Value, Non-vested, beginning balance (in dollars per share)	$ 121.70
Weighted Average Fair Value, Granted (in dollars per share)	104.31
Weighted Average Fair Value, Vested (in dollars per share)	104.57
Weighted Average Fair Value, Forfeited (in dollars per share)	120.30
Weighted Average Fair Value, Non-vested, ending balance (in dollars per share)	$ 119.35	$ 121.70
Performance Stock Units
Number of Shares
Number of Shares, Non-vested, beginning balance	186,482
Number of Shares, Granted	86,723
Number of Shares, Vested	(61,314)
Number of Shares, Forfeited	(19,782)
Number of Shares, Non-vested, ending balance	192,109	186,482
Weighted Average Grant Date Fair Value
Weighted Average Fair Value, Non-vested, beginning balance (in dollars per share)	$ 166.47
Weighted Average Fair Value, Granted (in dollars per share)	118.12	$ 183.39	$ 167.76
Weighted Average Fair Value, Vested (in dollars per share)	147.98
Weighted Average Fair Value, Forfeited (in dollars per share)	149.67
Weighted Average Fair Value, Non-vested, ending balance (in dollars per share)	$ 152.27	$ 166.47

Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Common Stock, Held in Treasury	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balances at Dec. 31, 2022	$ 10,465	$ 1	$ (467)	$ 601	$ 9,885	$ (89)	$ 534
Beginning balance, shares issued at Dec. 31, 2022		134,651,380
Beginning balance, Treasury Stock, Shares at Dec. 31, 2022			7,278,651
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	522				479		43
Other comprehensive loss	(9)					(9)	0
Common stock repurchased, shares			211,294
Common stock repurchased	(23)		$ (23)
Shares issued—stock- based compensation, shares			(1,050,656)
Shares issued—stock-based compensation	44		$ 55	(11)
Stock-based compensation	40			40
Dividends declared	(221)				(221)
Distributions to noncontrolling interests	(54)						(54)
Ending balances at Dec. 31, 2023	10,764	$ 1	$ (435)	630	10,143	(98)	523
Ending balance, shares issued at Dec. 31, 2023		134,651,380
Ending balance, Treasury Stock, Shares at Dec. 31, 2023			6,439,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	647				602		45
Other comprehensive loss	(49)					(46)	(3)
Common stock repurchased, shares			480,081
Common stock repurchased	(60)		$ (60)
Shares issued—stock- based compensation, shares			(495,004)
Shares issued—stock-based compensation	13		$ 28	(15)
Stock-based compensation	41			41
Dividends declared	(264)				(264)
Distributions to noncontrolling interests	(49)						(49)
Ending balances at Dec. 31, 2024	$ 11,043	$ 1	$ (467)	656	10,481	(144)	516
Ending balance, shares issued at Dec. 31, 2024	134,651,380	134,651,380
Ending balance, Treasury Stock, Shares at Dec. 31, 2024	6,424,366		6,424,366
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (1,471)				(1,508)		37
Other comprehensive loss	$ 65					64	1
Common stock repurchased, shares	725,652		725,652
Common stock repurchased	$ (63)		$ (63)
Shares issued—stock- based compensation, shares			(409,786)
Shares issued—stock-based compensation	3		$ 17	(14)
Stock-based compensation	41			41
Dividends declared	(272)				(272)
Distributions to noncontrolling interests	(51)						(51)
Ending balances at Dec. 31, 2025	$ 9,295	$ 1	$ (513)	$ 683	$ 8,701	$ (80)	$ 503
Ending balance, shares issued at Dec. 31, 2025	134,651,380	134,651,380
Ending balance, Treasury Stock, Shares at Dec. 31, 2025	6,740,232		6,740,232

Equity Method Investments (Narrative) (Details) lb in Millions, $ in Millions		12 Months Ended
	Jun. 17, 2015 lb	Dec. 31, 2025 USD ($) lb	Dec. 31, 2024 USD ($) lb	Dec. 31, 2023 USD ($) lb	Dec. 31, 2022 USD ($)	Mar. 15, 2022 USD ($)	Nov. 12, 2019 USD ($)	Oct. 28, 2019
Schedule of Equity Method Investments [Line Items]
Investments in joint ventures		$ 225
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity		199
Contract with Customer, Liability		147	$ 62	$ 52	$ 42
Equity method investments		1,062	1,081
Net sales		11,170	12,142	12,548
Accounts receivable, net		1,504	1,483
Accounts payable		$ 783	851
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Schedule of Equity Method Investments [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		20 years
Revenue, Remaining Performance Obligation, Amount		$ 187
LACC, LLC
Schedule of Equity Method Investments [Line Items]
Reimbursement agreement term		6 years 6 months
Contract with Customer, Liability		$ 32	27
Net sales		37	8	$ 12
Accounts receivable, net		2	1
Accounts payable		$ 17	15
LACC, LLC \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Schedule of Equity Method Investments [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		25 years
Revenue, Remaining Performance Obligation, Amount		$ 47
Lotte Chemical Corporation
Schedule of Equity Method Investments [Line Items]
Contract with Customer, Liability		40	$ 35
Lotte Chemical Corporation \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Schedule of Equity Method Investments [Line Items]
Revenue, Remaining Performance Obligation, Amount		$ 65
LACC, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)		50.00%				3.20%	34.80%	12.00%
Additional interest purchased						$ 89	$ 817
Investments in and Advances to Affiliates, Proportionate Share Of Production, Mass \| lb		1,056	614	935
Other equity method investments
Schedule of Equity Method Investments [Line Items]
Equity method investments		$ 71	$ 63
Affiliates
Schedule of Equity Method Investments [Line Items]
Plant capacity (in lbs) \| lb	2,200

Long-Term Debt (New Credit Agreement) (Details) - USD ($) $ in Millions	Jun. 09, 2022	Dec. 31, 2025	Dec. 31, 2024
Credit Agreement [Line Items]
Long-term debt, carrying value		$ 5,584	$ 4,562
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Minimum
Credit Agreement [Line Items]
Line Of Credit Facility Permitted Increase	$ 25
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Maximum
Credit Agreement [Line Items]
Line Of Credit Facility Permitted Increase	500
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Revolving Credit Facility
Credit Agreement [Line Items]
Maximum borrowing capacity	$ 1,500
Long-term debt, carrying value		0
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| Minimum \| Secured Overnight Financing Rate (SOFR)
Credit Agreement [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| Minimum \| Alternate Base Rate
Credit Agreement [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.00%
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| Maximum \| Secured Overnight Financing Rate (SOFR)
Credit Agreement [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.625%
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Revolving Credit Facility \| Maximum \| Alternate Base Rate
Credit Agreement [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.625%
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Letter of Credit
Credit Agreement [Line Items]
Maximum borrowing capacity	$ 150
New Credit Agreement \| Senior Secured Revolving Credit Facility \| Swingline Loan
Credit Agreement [Line Items]
Maximum borrowing capacity	$ 50
New Credit Agreement \| Standby Letters of Credit \| Revolving Credit Facility
Credit Agreement [Line Items]
Long-term debt, carrying value		$ 45

Inventories

12 Months Ended

Dec. 31, 2025

Inventory, Net [Abstract]

Inventories

Inventories consisted of the following at December 31:


	2025		2024
Finished products	$	1,030	$	1,047
Feedstock, additives, chemicals and other raw materials	366		395
Materials and supplies	257		255
Inventories	$	1,653	$	1,697

Property, Plant And Equipment (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Depreciation expense on property, plant and equipment		$ 797	$ 759	$ 763
Impairment of goodwill and long-lived assets		$ 727	$ 0	$ 475
Performance and Essential Materials Segment
Property, Plant and Equipment [Line Items]
Impairment of goodwill and long-lived assets	$ 347

Employee Benefits

12 Months Ended

Dec. 31, 2025

Retirement Benefits [Abstract]

Employee Benefits

Defined Contribution Plans

U.S. Plans

The Company has a defined contribution savings plan covering eligible U.S. regular full-time and part-time employees, whereby eligible employees may elect to contribute up to 100% of their annual eligible compensation, subject to an annual plan limit in line with the annual elective contribution limit as determined by the Internal Revenue Service. The Company matches its employee's contribution up to a certain percentage of such employee's compensation, per the terms of the plan. The Company may, at its discretion and per the terms of the plan, make an additional non-matching contribution in an amount as the Board of Directors may determine. For the years ended December 31, 2025, 2024 and 2023, the Company recorded approximately $39, $39 and $36, respectively, to expense for these contributions.

Further, within the plan, the Company also makes an annual retirement contribution to substantially all employees of certain subsidiaries. The Company's contributions to the plan are determined as a percentage of employees' pay. For the years ended December 31, 2025, 2024 and 2023, the Company charged approximately $61, $63 and $48, respectively, to expense for these contributions.

Non-U.S. Plans

The Company has defined contribution plans in several countries covering eligible employees of the Company. The Company's contributions to the plans are based on applicable laws in each country and eligibility of employees of certain subsidiaries for the annual retirement contribution. Contributions to the Company's non-U.S. defined contribution plans are made by both the employee and the Company.

Defined Benefit Plans

U.S. Plans

The Company has noncontributory defined benefit pension plans that cover certain eligible salaried and wage employees of certain subsidiaries. However, eligibility and benefits for the Company's plans have been frozen. Benefits for salaried employees under these plans are based primarily on years of service and employees' pay before the freeze date and benefits for hourly wage employees are based upon years of service and a fixed amount determined at the time when benefits were frozen. The Company recognizes the years of service prior to the Company's acquisition of the subsidiary's facilities for purposes of determining eligibility and benefit levels for certain employees of the subsidiary. The annual measurement date for these plans is December 31.

Non-U.S. Plans

The Company has defined benefit pension plans covering current and former employees associated with the Company's operations. Several non-U.S. pension plans are unfunded and have no plan assets. These pension plans are closed to new participants. Benefits for employees for these plans are based primarily on employees' pay near retirement. The annual measurement date for the non-U.S. plans is December 31.

Details of the changes in benefit obligations, plan assets and funded status of the Company's pension plans are as follows:


	2025				2024
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Change in benefit obligation
Benefit obligation, beginning of year	$	464	$	554	$	494	$	629

Service cost	3		4		4		4
Administrative expenses paid	(3)		—		(4)		—
Interest cost	23		20		23		19
Actuarial loss (gain)	6		(52)		(14)		(34)
Benefits paid	(38)		(26)		(39)		(23)
Plan amendments	—		—		—		—
Curtailments	—		(5)		—		—
Settlements (1)	(148)		(2)		—		(5)
Foreign exchange effects	—		68		—		(36)

Benefit obligation, end of year	$	307	$	561	$	464	$	554

Change in plan assets
Fair value of plan assets, beginning of year	$	417	$	378	$	427	$	391

Actual return	54		(27)		31		22
Employer contribution	3		18		2		16
Benefits paid	(38)		(26)		(39)		(23)
Administrative expenses paid	(3)		—		(4)		—
Settlements (1)	(148)		(2)		—		(5)
Foreign exchange effects	—		46		—		(23)
Fair value of plan assets, end of year	$	285	$	387	$	417	$	378
Funded status, end of year	$	(22)	$	(174)	$	(47)	$	(176)

______________________________

(1)During 2025, the Company settled a portion of its U.S Plan's pension obligations, in the amount of $148 collectively, through an annuity purchase and one-time lump sum payments. The annuity purchase, funded with the pension plan assets, settled obligations relating to certain eligible retirees through the purchase of a third-party group annuity contract from an insurance company in November 2025 for $146. The collective one-time lump sum payments for eligible participants throughout the 2025 calendar year totaled $2. This settlement resulted in a non-cash pension settlement gain of $32, reflected in other income, net, primarily related to the accelerated recognition of actuarial gain included in accumulated other comprehensive income (loss).

The actuarial loss (gain) in the benefit obligation for the periods presented is primarily driven by discount rate assumption changes.


	2025				2024
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Amounts recognized in the consolidated balance sheet at December 31
Noncurrent assets	$	—	$	73	$	—	$	65
Current liabilities	(2)		(13)		(2)		(11)
Noncurrent liabilities	(20)		(234)		(45)		(230)
Net amount recognized	$	(22)	$	(174)	$	(47)	$	(176)


	2025				2024
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Amounts recognized in accumulated other comprehensive income (loss)
Net loss (gain)	$	(64)	$	9	$	(79)	$	23
Prior service credit	(1)		(3)		(1)		(3)

Total before tax (1)	$	(65)	$	6	$	(80)	$	20

______________________________

(1)After-tax totals for pension benefits were a gain of $40 and of $44 for 2025 and 2024, respectively, and are reflected in stockholders' equity as accumulated other comprehensive income (loss).

In the U.S., the Pension Protection Act of 2006 (the "Pension Protection Act") established a relationship between a qualified pension plan's funded status and the actual benefits that can be provided. Restrictions on plan benefits and additional funding and notice requirements are imposed when a plan's funded status is less than certain threshold levels. For the 2025 plan year, the funded status for the Company's U.S. pension plans are above 80% and, as such, are exempt from the Pension Protection Act's benefit restrictions.

Pension plans with an accumulated benefit obligation in excess of plan assets at December 31 are as follows:


	2025				2024
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Information for pension plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	$	(307)	$	(248)	$	(464)	$	(241)
Accumulated benefit obligation	(307)		(246)		(464)		(239)
Fair value of plan assets	(285)		—		417		—

The following table provides the components of net periodic benefit costs, other changes in plan assets and benefit obligation recognized in other comprehensive income.


	Year Ended December 31,
	2025				2024				2023
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Components of net periodic benefit cost
Service cost	$	3	$	4	$	4	$	4	$	4	$	4
Interest cost	23		20		23		19		24		19
Expected return on plan assets	(27)		(16)		(28)		(15)		(26)		(12)
Net amortization	(5)		—		(3)		1		(1)		(2)
Settlement gain	(32)		—		—		—		—		—
Net periodic benefit cost (gain)	$	(38)	$	8	$	(4)	$	9	$	1	$	9

Other changes in plan assets and benefit obligation recognized in other comprehensive income (OCI)
Net loss (gain) emerging	$	(22)	$	(15)	$	(16)	$	(41)	$	(36)	$	74

Amortization of prior service credit	—		—		—		1		1		—
Amortization of net gain (loss)	5		—		3		(2)		—		2
Settlement benefits	32		—		—		—		—		—
Foreign exchange effects	—		3		—		(1)		—		1
Total recognized in OCI	$	15	$	(12)	$	(13)	$	(43)	$	(35)	$	77
Total net periodic benefit cost and OCI	$	(23)	$	(4)	$	(17)	$	(34)	$	(34)	$	86

The estimated prior service credit and net gain for the defined benefit plans to be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost during 2026 are expected to be $1 and $7, respectively.

The weighted-average assumptions used to determine pension plan obligations and net periodic benefit costs for the plans are as follows:


	2025				2024				2023
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Weighted average assumptions used to determine benefit obligations at December 31
Discount rate	5.2	%	4.2	%	5.5	%	3.5	%	5.0	%	3.2	%
Rate of compensation increase	—	%	3.0	%	—	%	3.0	%	—	%	3.1	%
Weighted average assumptions used to determine net periodic benefit costs for years ended December 31
Discount rate for benefit obligations	5.5	%	3.5	%	5.0	%	3.2	%	4.9	%	3.7	%
Discount rate for service cost	5.4	%	3.7	%	5.0	%	3.6	%	5.0	%	3.8	%
Discount rate for interest cost	5.2	%	3.5	%	5.0	%	3.2	%	4.8	%	3.7	%
Expected return on plan assets	7.0	%	4.0	%	7.0	%	4.0	%	6.5	%	3.3	%
Rate of compensation increase	—	%	3.0	%	—	%	3.1	%	—	%	2.9	%

The discount rates for the Company's U.S. and non-U.S. plans are determined using a benchmark pension discount curve and applying spot rates from the curve to each year of expected benefit payments to determine the appropriate discount rate for the Company. The assumed long-term return on plan assets is estimated by considering factors such as the plan's overall investment strategy, current economic conditions and historical averages.

The Company's U.S. pension plan investments are held in the Westlake Defined Benefit Plan. The Company's overall investment strategy for these pension plan assets is to achieve a balance between moderate income generation and capital appreciation. The investment strategy includes a mix of approximately 55% of investments for long-term growth, and 45% for near-term benefit payments and liability hedging, with a diversification of asset types. These pension funds' investment policies target asset allocations of approximately 55% equity securities and 45% fixed income securities in order to pursue a balance between moderate income generation, capital appreciation and a reduction in funded status volatility.

The Company's non-U.S. pension plan investments are primarily held in three pension plans in the Netherlands (collectively, the "Netherlands Plan"). Per the terms of the Netherlands Plan asset management agreement between the Company and the asset manager, the Netherlands Plan's current portfolio is strategically weighted towards fixed income securities. The Netherlands Plan's investment policy targets asset allocations of approximately 20% equity securities and 80% fixed income securities. The Netherlands Plan's investment strategy allows for re-allocations of either of the equity or the fixed income securities from 0% up to 100%.

Equity securities primarily include investments in large-cap and small-cap companies located in the U.S. and international developed and emerging markets stocks. Fixed income securities are comprised of investment grade bonds, including U.S. Treasuries and U.S. and non-U.S. corporate bonds of companies from diversified industries. These bonds also include longer duration securities to reduce funding volatility and reduce the asset/liability mismatch in terms of interest rate sensitivity. The U.S. pension fund investment policy allows a discretionary range in various asset classes within the asset allocation model of up to 20%. The Company does not believe that there are significant concentrations of risk in the pension plan assets due to its strategy of asset diversification. At December 31, 2025, plan assets did not include direct ownership of the Company's common stock.

Under the accounting guidance for fair value measurements, inputs used to measure fair value are classified in one of three levels:

Level 1: Quoted market prices in active markets for identical assets or liabilities.

Level 2: Observable market-based inputs or unobservable inputs that are corroborated by market data.

Level 3: Unobservable inputs that are not corroborated by market data.

The investments in the collective trust and mutual funds are valued using a market approach based on the net asset value of units held. The fair values of the Company's plan assets at December 31, by asset category, are as follows:


	2025
	U.S. Plans								Non-U.S. Plans
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash and common stock:
Cash and cash equivalents	$	—	$	—	$	—	$	—	$	6	$	—	$	—	$	6

Collective investment trust and mutual funds—Equity securities:
Large-cap funds (1)	21		76		—		97		—		2		—		2
Small-cap funds (2)	—		7		—		7		—				—		—
International funds (3)	29		14		—		43		—		76		—		76
Collective investment trust and mutual funds—Fixed income:
Bond funds (4)	7		124		—		131		—		296		—		296
Short-term investment funds	—		7		—		7		—		—		—		—
Group insurance contract	—		—		—		—		—		—		7		7
	$	57	$	228	$	—	$	285	$	6	$	374	$	7	$	387


	2024
	U.S. Plans								Non-U.S. Plans
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash and common stock:
Cash and cash equivalents	$	—	$	—	$	—	$	—	$	4	$	—	$	—	$	4

Collective investment trust and mutual funds—Equity securities:
Large-cap funds (1)	31		112		—		143		—		1		—		1
Small-cap funds (2)	—		9		—		9		—		—		—		—
International funds (3)	41		20		—		61		—		74		—		74
Collective investment trust and mutual funds—Fixed income:
Bond funds (4)	10		181		—		191		—		292		—		292
Short-term investment funds	—		13		—		13		—		—		—		—
Group insurance contract	—		—		—		—		—		—		7		7
	$	82	$	335	$	—	$	417	$	4	$	367	$	7	$	378

______________________________

(1)Substantially all of the assets of these funds are invested in large-cap U.S. companies. The remainder of the assets of these funds is invested in cash reserves.

(2)Substantially all of the assets of these funds are invested in small-cap U.S. companies. The remainder of the assets of these funds is invested in cash reserves.

(3)Substantially all these assets of the U.S. Plans' funds are invested in international companies in developed markets (excluding the U.S.), and the remainder of the assets of these funds is invested in cash reserves. The assets of the non-U.S. Plans' funds are primarily invested in diversified global equities, real estate and private equities.

(4)These assets of the U.S. Plans' funds represent investment grade bonds of U.S. issuers, including U.S. Treasury notes. The assets of the non-U.S. Plans represent fixed income funds that are primarily invested in international government bonds and mortgage funds.

The Company's funding policy for its U.S. plans is consistent with the minimum funding requirements of federal law and regulations. Based on preliminary estimates, the Company expects to make contributions of approximately $10 and $5 for the U.S. and Non-U.S. pension plans, respectively, in 2026.

Multi-employer Plans

Non-U.S. Plans

The Company participates in two multi-employer plans, Pensionskasse der Mitarbeiter der Hoechst-Gruppe VVaG and Pensionskasse der Wacker-Chemie GmbH VVaG, which provide benefits to certain of the Company's employees in Germany. These multi-employer plans are closed to new participants. The plans provide fixed, monthly retirement payments on the basis of the credits earned by the participating employees. To the extent that the plans are underfunded, future contributions to the plans may increase and may be used to fund retirement benefits for employees related to other employers. The benefit obligations are covered up to a certain salary threshold by contributions made by the Company and employees to the plans. Contributions to the Company's multi-employer plans are expensed as incurred.

Other Post-retirement Benefits

In the U.S., the Company provides post-retirement healthcare and life insurance benefits for certain employees and their dependents who meet minimum age and service requirements. The Company has the right to modify or terminate some of these benefits. The Company has a post-retirement plan in Canada which is unfunded and provides medical and life insurance benefits for certain employees and their dependents. The Company also has an unfunded post-retirement benefit plan in the Netherlands.

Estimated Future Benefit Payments

The following benefit payments are expected to be paid:


	Pension Benefits
Estimated future benefit payments:
Year 1	$	58
Year 2	57
Year 3	56
Year 4	55
Year 5	56
Years 6 to 10	275

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (o)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (p)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480266/715-60-50-3

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480126/715-20-S99-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/715/tableOfContent

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Commitments and Contingencies (Narrative) (Details) $ in Thousands, € in Millions, R$ in Millions	1 Months Ended					12 Months Ended
	Nov. 30, 2025 USD ($)	Nov. 30, 2024 USD ($)	May 31, 2024 BRL (R$)	Jul. 31, 2023 EUR (€)	Mar. 31, 2019 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($)
Environmental Loss Contingencies [Line Items]
Loss contingency accrual						$ 69,000		$ 72,000
Minimum
Environmental Loss Contingencies [Line Items]
Reasonably possible loss contingencies related to environmental matters						100,000
Maximum
Environmental Loss Contingencies [Line Items]
Reasonably possible loss contingencies related to environmental matters						170,000
Caustic Soda Antitrust Proceedings
Environmental Loss Contingencies [Line Items]
Damages sought \| €				€ 80
Litigation settlement, amount awarded to other party						350
Caustic Soda Antitrust Proceedings \| Direct Purchasers \| Settled Litigation
Environmental Loss Contingencies [Line Items]
Damages sought					$ 861,000
Caustic Soda Antitrust Proceedings \| Indirect Purchasers \| Settled Litigation
Environmental Loss Contingencies [Line Items]
Damages sought					$ 500,000
Ethylene Antitrust Litigation Proceedings \| Pending Litigation
Environmental Loss Contingencies [Line Items]
Damages sought \| €							€ 8,738
Brazilian Contractual Indemnification Lawsuit
Environmental Loss Contingencies [Line Items]
Damages awarded \| R$			R$ 550
Legal fee and procedural fine percent			20.00%
Calvert City Proceedings
Environmental Loss Contingencies [Line Items]
Damages sought	$ 39,000
Sulphur Brine Dome
Environmental Loss Contingencies [Line Items]
Damages sought		$ 100,000
Loss contingency accrual						$ 26,000

Stock-Based Compensation (Schedule Of Range Of Exercise Prices For Outstanding Options) (Details)	12 Months Ended
	Dec. 31, 2025 $ / shares shares
$44.42 - $65.81
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 44.42
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 65.81
Options Outstanding \| shares	242,037
Weighted Average Remaining Contractual Life (Years)	3 years 1 month 6 days
$79.83 - $86.54
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 79.83
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 86.54
Options Outstanding \| shares	219,531
Weighted Average Remaining Contractual Life (Years)	4 years 3 months 18 days
$107.75 - $108.12
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 107.75
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 108.12
Options Outstanding \| shares	208,932
Weighted Average Remaining Contractual Life (Years)	5 years
$110.15 - $110.15
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 110.15
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 110.15
Options Outstanding \| shares	233,222
Weighted Average Remaining Contractual Life (Years)	9 years 1 month 6 days
$122.65 - $144.49
Share-Based Payment Arrangement, Option, Exercise Price Range [Line Items]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 122.65
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 144.49
Options Outstanding \| shares	311,535
Weighted Average Remaining Contractual Life (Years)	7 years 7 months 6 days

Goodwill and Other Intangible Assets (Schedule of Finite-Lived Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Intangible Asset, Acquired, Finite-Lived [Line Items]
Net	$ 743	$ 820
Customer relationships
Intangible Asset, Acquired, Finite-Lived [Line Items]
Customer relationships	1,582	1,570
Accumulated Amortization	$ (839)	(750)
Weighted Average Life	15 years
Licenses and intellectual property
Intangible Asset, Acquired, Finite-Lived [Line Items]
Licenses and intellectual property, Gross	$ 266	260
Accumulated Amortization	(149)	(138)
Net	$ 117	122
Weighted Average Life	15 years
Trade name
Intangible Asset, Acquired, Finite-Lived [Line Items]
Trade name, Gross	$ 388	381
Accumulated Amortization	(140)	(120)
Net	$ 248	261
Weighted Average Life	18 years
Other
Intangible Asset, Acquired, Finite-Lived [Line Items]
Other, Gross	$ 116	106
Accumulated Amortization	(42)	(27)
Net	$ 74	79
Weighted Average Life	17 years
Total other intangible assets
Intangible Asset, Acquired, Finite-Lived [Line Items]
Finite-Lived Intangible Assets, Gross	$ 770	747
Accumulated Amortization	(331)	(285)
Net	$ 439	$ 462

Inventories (Tables)

12 Months Ended

Dec. 31, 2025

Inventory, Net [Abstract]

Schedule Of Inventory

Inventories consisted of the following at December 31:


	2025		2024
Finished products	$	1,030	$	1,047
Feedstock, additives, chemicals and other raw materials	366		395
Materials and supplies	257		255
Inventories	$	1,653	$	1,697

Income Taxes (Summary of Valuation Allowance) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Valuation allowance	$ 298	$ 170	$ 118	$ 47
Additional allowances	128	55	94
Reversals & other changes	$ 0	$ (3)	$ (23)

Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Unrecognized Tax Benefits [Roll Forward]
Gross unrecognized tax benefits, beginning of year	$ 42	$ 35	$ 24
Additions for tax positions of current year	3	7	6
Additions for tax positions of prior years	1	1	15
Reductions for tax positions of prior years	(1)	0	(10)
Lapse of statute of limitations	(3)	(1)	0
Gross unrecognized tax benefits, end of year	$ 42	$ 42	$ 35

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Schedule Of Long-Term Debt

Long-term debt consisted of the following at December 31:


	2025		2024



3.60% senior notes due August 2026 (the "3.60% 2026 Senior Notes") (1)	$	496		$	750
Loan related to tax-exempt waste disposal revenue bonds due December 2027 (2)	11			11
1.625% €700 million senior notes due July 2029 (the "1.625% 2029 Senior Notes") (1)	822			727
3.375% senior notes due June 2030 (the "3.375% 2030 Senior Notes") (1)	300			300
3.50% senior notes due November 2032 (the "3.50% 2032 tax-exempt GO Zone Refunding Senior Notes") (1)	250			250
5.550% senior notes due November 2035 (the "5.550% 2035 Senior Notes") (1)	600			—
2.875% senior notes due August 2041 (the "2.875% 2041 Senior Notes") (1)	350			350
5.00% senior notes due August 2046 (the "5.00% 2046 Senior Notes") (1)	700			700
4.375% senior notes due November 2047 (the "4.375% 2047 Senior Notes") (1)	500			500
3.125% senior notes due August 2051 (the "3.125% 2051 Senior Notes") (1)	600			600
6.375% senior notes due November 2055 (the "6.375% 2055 Senior Notes") (1)	600			—
3.375% senior notes due August 2061 (the "3.375% 2061 Senior Notes") (1)	450			450
Term loans due March 2026	1			7
Long-term debt, principal amount	5,680			4,645
Less:
Unamortized discount and debt issuance costs	96			83
Long-term debt, carrying value	5,584			4,562
Less:
3.60% 2026 Senior Notes	496			—
Current portion of long-term debt	1			6
Long-term debt, carrying value, net of current portion	$	5,087		$	4,556

______________________________

(1) The par call dates for these Senior Notes are between three to six months prior to the respective maturity dates, except for the 3.50% 2032 tax-exempt GO Zone Refunding Senior Notes for which the par call date is November 2027.

(2) Interest on the waste disposal revenue bonds accrues at a rate determined by a remarketing agent. The interest rate on the waste disposal revenue bonds at December 31, 2025 was 2.48%.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

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+ Details

Segment and Geographic Information (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Segment Reporting Information


	Year Ended December 31,
	2025		2024		2023
Net external sales
Housing and Infrastructure Products
Housing Products	$	3,513	$	3,644	$	3,494
Infrastructure Products	635		673		718
Total Housing and Infrastructure Products	4,148		4,317		4,212
Performance and Essential Materials
Performance Materials	4,018		4,626		4,656
Essential Materials	3,004		3,199		3,680

Total Performance and Essential Materials	7,022		7,825		8,336

Total reportable segments and consolidated	$	11,170	$	12,142	$	12,548


Intersegment sales

Performance and Essential Materials	406		484		408
Total reportable segments	$	406	$	484	$	408

Significant segment expenses
Housing and Infrastructure Products
Raw material, energy, manufacturing and logistics costs	$	2,898	$	2,882	$	2,873
Depreciation and amortization	154		138		132
Total cost of sales	$	3,052	$	3,020	$	3,005
Selling, general and administrative expenses	416		410		400
Depreciation and amortization	77		75		75
Restructuring, transaction and integration-related costs	16		5		22


Performance and Essential Materials
Raw material, energy, manufacturing and logistics costs	$	6,827	$	6,808	$	6,926
Depreciation and amortization	881		838		823
Total cost of sales	$	7,708	$	7,646	$	7,749


	Year Ended December 31,
	2025		2024		2023
Selling, general and administrative expenses	416		394		401
Depreciation and amortization	53		54		58
Impairment of goodwill and long-lived assets	727		—		475
Restructuring, transaction and integration-related costs	624		86		2


Income (loss) from operations
Housing and Infrastructure Products	$	587	$	807	$	710
Performance and Essential Materials	(2,100)		129		59
Total reportable segments	$	(1,513)	$	936	$	769

Depreciation and amortization
Housing and Infrastructure Products	$	231	$	213	$	207
Performance and Essential Materials	934		892		881
Total reportable segments	1,165		1,105		1,088
Corporate and other	13		9		9
Consolidated	$	1,178	$	1,114	$	1,097

Other income, net
Housing and Infrastructure Products	$	5	$	30	$	32
Performance and Essential Materials	57		65		25
Total reportable segments	62		95		57
Corporate and other	90		127		79
Consolidated	$	152	$	222	$	136

Provision for (benefit from) income taxes
Housing and Infrastructure Products	$	162	$	336	$	194
Performance and Essential Materials	(310)		68		(63)
Total reportable segments	(148)		404		131
Corporate and other	22		(113)		47
Consolidated	$	(126)	$	291	$	178







Capital expenditures
Housing and Infrastructure Products	$	189	$	185	$	164
Performance and Essential Materials	795		821		857
Total reportable segments	984		1,006		1,021
Corporate and other	11		2		13
Consolidated	$	995	$	1,008	$	1,034

Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes

A reconciliation of total reportable segments income (loss) from operations to consolidated income (loss) before income taxes is as follows:


	Year Ended December 31,
	2025		2024		2023
Total reportable segments income (loss) from operations	$	(1,513)	$	936	$	769
Corporate and other loss from operations	(65)		(61)		(40)
Interest expense	(171)		(159)		(165)
Other income, net	152		222		136
Income (loss) before income taxes	$	(1,597)	$	938	$	700

Total Assets


	December 31, 2025		December 31, 2024
Total assets
Housing and Infrastructure Products	$	4,913	$	4,855
Performance and Essential Materials (1)	12,091		13,151
Total reportable segments	17,004		18,006
Corporate and other	2,957		2,744
Consolidated	$	19,961	$	20,750

Geographic Information For Sales To External Customers And Long-Lived Assets

Geographic Information


	Year Ended December 31,
	2025		2024		2023
Net sales to external customers (2)
United States	$	7,954	$	8,751	$	8,955
Foreign
Canada	777		792		808
Germany	583		594		602
Mexico	194		206		217
China	162		195		220
Brazil	153		142		215
Italy	144		145		135
France	125		120		138
Other	1,078		1,197		1,258
	$	11,170	$	12,142	$	12,548


	December 31, 2025		December 31, 2024
Property, plant and equipment, net
United States	$	7,305	$	7,465
Foreign
Germany	873		766
Other	427		402
	$	8,605	$	8,633

______________________________

(1)Includes equity method investments of $1,062 and $1,081 as of December 31, 2025 and 2024, respectively.

(2)Net sales are attributed to countries based on location of customer.

Stock-Based Compensation (Schedule Of Weighted Average Value And Assumptions For Fair Value Of Options) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Weighted average fair value (in dollars per share)	$ 36.52	$ 52.17	$ 44.91
Risk-free interest rate	4.30%	4.30%	4.00%
Expected life in years	5 years	5 years	5 years
Expected volatility	37.30%	38.40%	39.10%
Expected dividend yield	1.90%	1.20%	1.10%

Segment and Geographic Information (Geographic Information for Sales to External Customers and Long-lived Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 11,170	$ 12,142	$ 12,548
Long-lived assets	8,605	8,633
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	7,954	8,751	8,955
Long-lived assets	7,305	7,465
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	777	792	808
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	583	594	602
Long-lived assets	873	766
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	194	206	217
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	162	195	220
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	144	145	135
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	153	142	215
France
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	125	120	138
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,078	1,197	$ 1,258
Long-lived assets	$ 427	$ 402

Financial Instruments

12 Months Ended

Dec. 31, 2025

Investments, Debt and Equity Securities [Abstract]

Financial Instruments

Cash Equivalents

The Company had $0 and $1,009 of held-to-maturity securities with original maturities of three months or less, primarily consisting of corporate debt securities, classified as cash equivalents at December 31, 2025 and December 31, 2024, respectively. The Company's investments in held-to-maturity securities were held at amortized cost, which approximates fair value.

Restricted Cash and Cash Equivalents

The Company had restricted cash and cash equivalents of $16 and $16 at December 31, 2025 and 2024, respectively. The Company's restricted cash and cash equivalents are primarily related to balances that are restricted for payment of distributions to certain of the Company's current and former employees and are reflected primarily in other assets, net in the Company's consolidated balance sheets.

Available-for-Sale Securities

The Company had no available-for-sale securities at December 31, 2024. Investments in securities at December 31, 2025 consisted of available-for-sale debt securities.


	2025		2024


Available-for-sale securities	$	204	$	—

The cost, fair value and fair value levels of the Company's available-for-sale debt securities were as follows:


	2025
	Cost		Fair Value		Fair Value Level
Debt securities
Corporate bonds	$	108	$	109	Level 2
U.S. government treasury securities	37		37		Level 2
U.S. federal agency securities	13		13		Level 2
Asset-backed securities	37		37		Level 2
Supranational securities	8		8		Level 2
Available-for-sale debt securities	$	203	$	204

Contractual maturities of debt securities
Within one year	$	63	$	63
One to five years	128		129
Six to ten years	2		2
After ten years	10		10
Available-for-sale debt securities	$	203	$	204

The fair values of the available-for-sale debt securities are determined based on observable market-based inputs, such as quotes from financial reporting services. Unrealized and realized gains and losses, and accrued interest on available-for-sale debt securities for the twelve months ended December 31, 2025 were immaterial. As of December 31, 2025, no allowance for credit losses was recorded for these investments.

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Cybersecurity Risk Management and Strategy Disclosure	Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	The Company maintains a comprehensive approach to cybersecurity and data protection, based on a risk-based, defense-in-depth strategy. We regularly assess industry best practices and standards and endeavor to implement them in our efforts to manage cybersecurity risk. We follow industry standard cybersecurity frameworks, including the National Institute of Standards and Technology Cybersecurity Framework, to design, assess and update our cybersecurity strategy, controls and processes. Our focus is on protecting our highest-value information assets, which include manufacturing systems, financial systems, and confidential, personal, and private information. To safeguard our networks and systems, we have a dedicated cybersecurity organization overseen by our Senior Director, Cybersecurity and Network Operations, which operates within our information technology department overseen by the Chief Information Officer. Our cybersecurity organization employs multiple security controls, such as firewalls, spam protection, web filtering, endpoint detection and response software, controlled access, vulnerability management, redundancies, patching, and regular onsite and offsite backups. Our cybersecurity organization also uses a variety of processes to address cybersecurity threats related to the use of third-party technology and services, including pre-acquisition diligence, imposition of contractual obligations, and risk-based performance monitoring. Both our Chief Information Officer and our Senior Director, Cybersecurity and Network Operations have extensive experience in assessing and managing cybersecurity risks, including through decades of collective experience in information technology and cybersecurity roles of increasing responsibility both at the Company and in prior positions. We prioritize cybersecurity awareness among our employees and contractors through various training exercises, including formal programs and simulated phishing events. We maintain incident response plans, playbooks, and engage third-party cybersecurity firms for simulated cyberattacks and penetration testing to identify potential risks. We also have a third-party cybersecurity firm on retainer for incident assistance and response. Periodic internal self-assessments are conducted by our cybersecurity organization using the National Institute of Standards and Technology Cybersecurity Framework. From time to time, we experience cybersecurity threats and attempted breaches and other incidents. We classify and track these events based on significance and implement remediation actions that we consider appropriate to address the risks relating to such incidents. Although we have not experienced material impacts to our business strategy, results of operations or financial condition from any such incidents in the past three years, we cannot guarantee that a material incident will not occur in the future. Refer to "Failure to adequately protect critical data and technology systems could materially affect our operations" under "Item 1A. Risk Factors—Legal, Government and Regulatory Risks" of this Form 10-K.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	The Company maintains a comprehensive approach to cybersecurity and data protection, based on a risk-based, defense-in-depth strategy. We regularly assess industry best practices and standards and endeavor to implement them in our efforts to manage cybersecurity risk. We follow industry standard cybersecurity frameworks, including the National Institute of Standards and Technology Cybersecurity Framework, to design, assess and update our cybersecurity strategy, controls and processes. Our focus is on protecting our highest-value information assets, which include manufacturing systems, financial systems, and confidential, personal, and private information.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Our Board has charged the Corporate Risk and Sustainability Committee with assisting the Board with its oversight of cybersecurity risks, which is a component of our overall enterprise risk management program. The Corporate Risk and Sustainability Committee includes directors with cybersecurity experience and expertise through supervision of information technology departments as executive officers. The Corporate Risk and Sustainability Committee receives regular updates from senior management and our Chief Information Officer on cybersecurity risks, incidents and trends, and ongoing and planned projects. Regular status reports are also provided by the cybersecurity organization to our Chief Information Officer and other members of our senior management and incident updates are reported to senior management as the Chief Information Officer and cybersecurity organization considers appropriate depending on the severity of the incident.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our Board has charged the Corporate Risk and Sustainability Committee with assisting the Board with its oversight of cybersecurity risks, which is a component of our overall enterprise risk management program.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our Board has charged the Corporate Risk and Sustainability Committee with assisting the Board with its oversight of cybersecurity risks, which is a component of our overall enterprise risk management program. The Corporate Risk and Sustainability Committee includes directors with cybersecurity experience and expertise through supervision of information technology departments as executive officers. The Corporate Risk and Sustainability Committee receives regular updates from senior management and our Chief Information Officer on cybersecurity risks, incidents and trends, and ongoing and planned projects.
Cybersecurity Risk Role of Management [Text Block]	The Corporate Risk and Sustainability Committee receives regular updates from senior management and our Chief Information Officer on cybersecurity risks, incidents and trends, and ongoing and planned projects. Regular status reports are also provided by the cybersecurity organization to our Chief Information Officer and other members of our senior management and incident updates are reported to senior management as the Chief Information Officer and cybersecurity organization considers appropriate depending on the severity of the incident. As part of our incident response planning, we also maintain cross-functional response teams involving personnel outside of our cybersecurity organization, both globally and regionally, in order to be prepared to respond to an incident.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	To safeguard our networks and systems, we have a dedicated cybersecurity organization overseen by our Senior Director, Cybersecurity and Network Operations, which operates within our information technology department overseen by the Chief Information Officer.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Both our Chief Information Officer and our Senior Director, Cybersecurity and Network Operations have extensive experience in assessing and managing cybersecurity risks, including through decades of collective experience in information technology and cybersecurity roles of increasing responsibility both at the Company and in prior positions.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The Corporate Risk and Sustainability Committee receives regular updates from senior management and our Chief Information Officer on cybersecurity risks, incidents and trends, and ongoing and planned projects. Regular status reports are also provided by the cybersecurity organization to our Chief Information Officer and other members of our senior management and incident updates are reported to senior management as the Chief Information Officer and cybersecurity organization considers appropriate depending on the severity of the incident.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Leases (Tables)

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Lease related asset and liability

Lease-related asset and liability balances consisted of the following at December 31:


	2025			2024
Operating Leases
Right-of-use assets	$	798		$	801

Accrued and other liabilities	$	138		$	128
Operating lease liabilities	688			713
Total operating lease liabilities	$	826		$	841

Weighted Average Remaining Term (in years)	8			9
Weighted Average Lease Discount Rate	4.4		%	4.2		%

Lease, Cost

The components of operating lease expense were as follows:


	Year Ended December 31,
	2025		2024		2023
Operating lease cost (1)	$	178	$	162	$	142
Short-term lease cost	128		131		121
Total operating lease cost	$	306	$	293	$	263

_____________________________

(1)Includes fixed lease payments for operating leases recorded in the consolidated balance sheet.

Lessee, Operating Lease, Liability, Maturity

Maturities of lease liabilities were as follows at December 31, 2025:


	Operating Leases
2026	$	166
2027	155
2028	138
2029	116
2030	92
Thereafter	346
Total lease payments	1,013
Less: imputed interest	(187)
Present value of lease liabilities	$	826

Income Taxes (Components Of Income (Loss) Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Domestic	$ (1,455)	$ 855	$ 923
Foreign	(142)	83	(223)
Income (loss) before income taxes	$ (1,597)	$ 938	$ 700

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details

Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense on restricted stock	$ 42	$ 41	$ 40
Intrinsic value of options exercised	3	9	34
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	$ 1	2	4
Cliff Vest \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, vesting period	1 year
Cliff Vest \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, vesting period	5 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option awards, term (in years)	10 years
Unrecognized compensation expense	$ 9
Unrecognized compensation expense, weighted-average period of recognition (in years)	1 year 8 months 12 days
Stock Options \| Ratably On Annual Basis
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, vesting period	3 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 32
Unrecognized compensation expense, weighted-average period of recognition (in years)	1 year 9 months 18 days
Total fair value of shares of restricted stock that vested	$ 23	30	28
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 12
Unrecognized compensation expense, weighted-average period of recognition (in years)	1 year 8 months 12 days
Total fair value of shares of restricted stock that vested	$ 7	$ 10	$ 13
Performance Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	0.00%
Performance Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	200.00%

Income Taxes (Income Taxes Paid) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Paid, by Individual Jurisdiction [Line Items]
US federal	$ 19
US state and local	8
Foreign	77
Income taxes paid	104	$ 422	$ 421
Canada
Income Tax Paid, by Individual Jurisdiction [Line Items]
Foreign	53
Taiwan
Income Tax Paid, by Individual Jurisdiction [Line Items]
Foreign	6
Korea
Income Tax Paid, by Individual Jurisdiction [Line Items]
Foreign	6
Other foreign jurisdictions
Income Tax Paid, by Individual Jurisdiction [Line Items]
Foreign	$ 12

Commitments and Contingencies (Minimum Purchase Obligations) (Details) $ in Millions	Dec. 31, 2025 USD ($)
Unconditional purchase obligations
Unrecorded Unconditional Purchase Obligation	$ 4,468
2026	1,134
2027	1,067
2028	675
2029	314
2030	274
Thereafter	$ 1,004

Insider Trading Policies and Procedures	12 Months Ended
Insider Trading Policies and Procedures	Dec. 31, 2025
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Stockholders' Equity (Details) - USD ($) $ in Millions	12 Months Ended
Stockholders' Equity (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Aug. 31, 2022	Aug. 31, 2018	Nov. 20, 2015	Nov. 30, 2014
Class of Stock [Line Items]
Dividends, Common Stock, Cash	$ 272	$ 264	$ 221
Common Stock, Voting Rights, Number of Votes Per Share	one
Stock repurchase program, authorized amount				$ 500	$ 150	$ 150	$ 250
Common stock repurchased, shares	725,652
Common stock repurchased	$ 63	$ 60	$ 23
Stock Repurchase Program, Shares Repurchased, Gross	9,928,283
Treasury Stock Purchase Price, Repurchase Program	$ 697
Treasury Stock
Class of Stock [Line Items]
Common stock repurchased, shares	725,652	480,081	211,294
Common stock repurchased	$ 63	$ 60	$ 23

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
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Reference 6: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Description of Business and Significant Accounting Policies (Asset Retirement Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation, Beginning Balance	$ 81	$ 40	$ 31
Asset Retirement Obligation, Liabilities Incurred	152	25	3
Asset Retirement Obligation, Liabilities Settled	(59)	(7)	(2)
Asset Retirement Obligation, Accretion Expense	1	3	1
Asset Retirement Obligation, Revision of Estimate	13	21	7
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss)	6	(1)	0
Asset Retirement Obligation, Ending Balance	194	81	40
Asset Retirement Obligation, Current	119	39	3
Asset Retirement Obligations, Noncurrent	$ 75	$ 42	$ 37

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Comprehensive income (loss), tax portion attributable to noncontrolling interest	$ 2	$ 2	$ 3

Segment and Geographic Information

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Segment and Geographic Information

Segment Information

The Company has two principal operating segments, which are the Company's reportable segments, Housing and Infrastructure Products and Performance and Essential Materials. These segments are strategic business units that each offer a variety of different materials and products. The Company manages each segment separately as each business requires different technology and marketing strategies. The operating results of each segment are reviewed by the Company's Chief Executive Officer, the chief operating decision maker ("CODM"). The CODM evaluates segment performance based on income from operations. The CODM reviews each segment's actual and forecasted income from operations to allocate resources and assess performance.

The Housing and Infrastructure Products segment manufactures and markets products including residential siding, trim and mouldings, stone, roofing, windows, outdoor living products, PVC pipe and fittings and compounds made from PVC and other polymers. As of December 31, 2025, the Company owned or leased 64 manufacturing facilities in North America, Europe and Asia. The Company's North American PVC facilities within the Performance and Essential Materials segment supply most of the PVC required for the building products and pipe and fittings plants. The raw materials for stone, roofing and accessories, windows, shutters and specialty tool products are externally purchased. PVC required for the compounds plants is either internally sourced from Company's North American or Asian facilities or externally purchased at market prices based on the location of the plants.

The Company's Performance and Essential Materials segment manufactures and markets polyethylene, ethylene co-products, PVC, VCM, ethylene dichloride ("EDC"), chlor-alkali (chlorine and caustic soda), chlorinated derivative products and epoxy resins. The Company's ethylene production is used in the Company's polyethylene and VCM operations. In addition, the Company sells ethylene and ethylene co-products, primarily propylene, crude butadiene, pyrolysis gasoline and hydrogen, to external customers. The Company's primary North American manufacturing facilities are located in its Calvert City, Kentucky; Lake Charles, Plaquemine and Geismar, Louisiana; Longview and Deer Park, Texas; Lakeland, Florida and Argo, Illinois sites. The Company's primary European facility is located in Germany. The Company produces ethylene and polyethylene at its facilities in Lake Charles, Louisiana; Calvert City, Kentucky and Longview, Texas. The Company produces chlorine, caustic soda, VCM, EDC, PVC, hydrogen and chlorinated derivative materials at its facilities in Lake Charles, Plaquemine and Geismar, Louisiana; Calvert City, Kentucky; Natrium, West Virginia; Longview, Washington; Beauharnois, Quebec and in Germany. Epoxy resins primarily comprise of Epoxy Specialty Resins and Base Epoxy Resins and Intermediaries. Epoxy Specialty Resins are produced at manufacturing facilities in Duisburg and Esslingen in Germany; Argo and Lakeland in the United States; one plant in Spain and one plant in South Korea. Base Epoxy Resins and Intermediaries are produced at Company's plant in Deer Park, United States. In addition, the Company also has other manufacturing facilities and product development facilities in North America, Europe and Asia. Certain production facilities under the Performance and Essential Materials segment ceased operations in 2025. See Note 18 for more detailed information.

No single customer accounted for 10% or more of net sales for the years ended December 31, 2025, 2024 or 2023.

The accounting policies of the individual segments are the same as those described in Note 1.


	Year Ended December 31,
	2025		2024		2023
Net external sales
Housing and Infrastructure Products
Housing Products	$	3,513	$	3,644	$	3,494
Infrastructure Products	635		673		718
Total Housing and Infrastructure Products	4,148		4,317		4,212
Performance and Essential Materials
Performance Materials	4,018		4,626		4,656
Essential Materials	3,004		3,199		3,680

Total Performance and Essential Materials	7,022		7,825		8,336

Total reportable segments and consolidated	$	11,170	$	12,142	$	12,548


Intersegment sales

Performance and Essential Materials	406		484		408
Total reportable segments	$	406	$	484	$	408

Significant segment expenses
Housing and Infrastructure Products
Raw material, energy, manufacturing and logistics costs	$	2,898	$	2,882	$	2,873
Depreciation and amortization	154		138		132
Total cost of sales	$	3,052	$	3,020	$	3,005
Selling, general and administrative expenses	416		410		400
Depreciation and amortization	77		75		75
Restructuring, transaction and integration-related costs	16		5		22


Performance and Essential Materials
Raw material, energy, manufacturing and logistics costs	$	6,827	$	6,808	$	6,926
Depreciation and amortization	881		838		823
Total cost of sales	$	7,708	$	7,646	$	7,749


	Year Ended December 31,
	2025		2024		2023
Selling, general and administrative expenses	416		394		401
Depreciation and amortization	53		54		58
Impairment of goodwill and long-lived assets	727		—		475
Restructuring, transaction and integration-related costs	624		86		2


Income (loss) from operations
Housing and Infrastructure Products	$	587	$	807	$	710
Performance and Essential Materials	(2,100)		129		59
Total reportable segments	$	(1,513)	$	936	$	769

Depreciation and amortization
Housing and Infrastructure Products	$	231	$	213	$	207
Performance and Essential Materials	934		892		881
Total reportable segments	1,165		1,105		1,088
Corporate and other	13		9		9
Consolidated	$	1,178	$	1,114	$	1,097

Other income, net
Housing and Infrastructure Products	$	5	$	30	$	32
Performance and Essential Materials	57		65		25
Total reportable segments	62		95		57
Corporate and other	90		127		79
Consolidated	$	152	$	222	$	136

Provision for (benefit from) income taxes
Housing and Infrastructure Products	$	162	$	336	$	194
Performance and Essential Materials	(310)		68		(63)
Total reportable segments	(148)		404		131
Corporate and other	22		(113)		47
Consolidated	$	(126)	$	291	$	178







Capital expenditures
Housing and Infrastructure Products	$	189	$	185	$	164
Performance and Essential Materials	795		821		857
Total reportable segments	984		1,006		1,021
Corporate and other	11		2		13
Consolidated	$	995	$	1,008	$	1,034

A reconciliation of total reportable segments income (loss) from operations to consolidated income (loss) before income taxes is as follows:


	Year Ended December 31,
	2025		2024		2023
Total reportable segments income (loss) from operations	$	(1,513)	$	936	$	769
Corporate and other loss from operations	(65)		(61)		(40)
Interest expense	(171)		(159)		(165)
Other income, net	152		222		136
Income (loss) before income taxes	$	(1,597)	$	938	$	700


	December 31, 2025		December 31, 2024
Total assets
Housing and Infrastructure Products	$	4,913	$	4,855
Performance and Essential Materials (1)	12,091		13,151
Total reportable segments	17,004		18,006
Corporate and other	2,957		2,744
Consolidated	$	19,961	$	20,750

Geographic Information


	Year Ended December 31,
	2025		2024		2023
Net sales to external customers (2)
United States	$	7,954	$	8,751	$	8,955
Foreign
Canada	777		792		808
Germany	583		594		602
Mexico	194		206		217
China	162		195		220
Brazil	153		142		215
Italy	144		145		135
France	125		120		138
Other	1,078		1,197		1,258
	$	11,170	$	12,142	$	12,548


	December 31, 2025		December 31, 2024
Property, plant and equipment, net
United States	$	7,305	$	7,465
Foreign
Germany	873		766
Other	427		402
	$	8,605	$	8,633

______________________________

(1)Includes equity method investments of $1,062 and $1,081 as of December 31, 2025 and 2024, respectively.

(2)Net sales are attributed to countries based on location of customer.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

+ Details

Description of Business and Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business

Westlake Corporation (the "Company") operates as an integrated global manufacturer and marketer of housing and infrastructure products and performance and essential materials. These products include some of the most widely used materials in the world, which are fundamental to many diverse consumer and industrial markets, including residential construction, flexible and rigid packaging, automotive products, healthcare products, water treatment, coatings as well as other durable and non-durable goods. The Company's customers range from large chemical processors and plastics fabricators to small construction contractors, municipalities and supply warehouses throughout North America, Europe and Asia. The industries in which the Company operates are subject to price fluctuations and volatile feedstock pricing typical of a commodity-based industry, the effects of which may not be immediately passed along to customers.

Westlake Chemical Partners LP

In 2014, the Company formed Westlake Chemical Partners LP ("Westlake Partners") to operate, acquire and develop ethylene production facilities and related assets. Westlake Partners' assets consist of a limited partner interest in Westlake Chemical OpCo LP ("OpCo"), as well as the general partner interest in OpCo. OpCo's assets include two ethylene production facilities at the Company's Lake Charles, Louisiana site, one ethylene production facility at the Company's Calvert City, Kentucky site and a 200-mile common carrier ethylene pipeline that runs from Mont Belvieu, Texas to the Company's Longview, Texas site. As of December 31, 2025, the Company held a 77.2% limited partner interest in OpCo and a controlling interest in Westlake Partners. The operations of Westlake Partners are consolidated in the Company's financial statements.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and subsidiaries in which the Company directly or indirectly owns more than a 50% voting interest and exercises control and, when applicable, entities for which the Company has a controlling financial interest or is the primary beneficiary. Investments in majority-owned companies where the Company does not exercise control and investments in nonconsolidated affiliates (20%-50% owned companies, joint ventures and partnerships) are accounted for using the equity method of accounting. Undistributed earnings from joint ventures included in retained earnings were immaterial as of December 31, 2025. All intercompany transactions and balances are eliminated in consolidation.

Noncontrolling interests represent the direct equity interests held by investors in the Company's consolidated subsidiaries, Westlake Partners, Taiwan Chlorine Industries, Ltd. and Suzhou Huasu Plastics Co., Ltd.

Basis of Presentation

The accompanying consolidated financial statements have been prepared in conformity with the accounting principles generally accepted in the United States.

Cash and Cash Equivalents

Cash equivalents consist of highly liquid investments that are readily convertible into cash and have a maturity of three months or less at the date of acquisition.

Concentration of Credit Risk

Financial instruments which potentially subject the Company to concentration of risk consist principally of trade receivables from customers engaged in manufacturing polyethylene products, polyvinyl chloride ("PVC") products, epoxy products, chlor-alkali and derivative products as well as housing and infrastructure products such as consumers and distributors of compounds, PVC pipe and fittings, trim and mouldings, stone, windows, roofing and exterior products. The Company's large number of customers, the diversity of these customers' businesses and the markets they serve and customers geographic dispersion limits the concentrations of credit risk with respect to receivables. The Company performs periodic credit evaluations of the customers' financial condition and generally does not require collateral. The Company maintains allowances for potential losses.

Allowance for Credit Losses

The determination of the allowance for credit losses is based on estimation of the amount of accounts receivable that the Company believes are unlikely to be collected. Estimating this amount requires analysis of the financial strength of the Company's customers, the use of historical experience, the Company's accounts receivable aged trial balance, customer specific collectability analysis and an evaluation of economic conditions. The allowance for credit losses is reviewed quarterly. Past due balances over 90 days and high-risk accounts as determined by the analysis of financial strength of customers are reviewed individually for collectability.

Inventories

Inventories primarily include product, material and supplies. Inventories are stated at lower of cost or net realizable value. Cost is determined using the first-in, first-out ("FIFO") or average method.

Property, Plant and Equipment

Property, plant and equipment are carried at cost, net of accumulated depreciation. Cost includes expenditures for improvements and betterments that extend the useful lives of the assets and interest capitalized on significant capital projects. Capitalized interest was $10, $13 and $8 for the years ended December 31, 2025, 2024 and 2023, respectively. Repair and maintenance costs are charged to operations as incurred. Gains and losses on the disposition or retirement of fixed assets are reflected in the consolidated statement of operations when the assets are sold or retired.

Depreciation is provided by utilizing the straight-line method over the estimated useful lives of the assets as follows:


Classification									Years
Buildings and improvements									40
Plant and equipment									10-25
Other									3-15

Impairment of Long-Lived Assets and Impairment of Goodwill and Intangible Assets

Impairment of Long-Lived Assets

The Company reviews long-lived assets, including tangible assets and intangible assets with finite lives, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Long-lived assets assessed for impairment are grouped by asset group, the lowest level for which identifiable cash flows are largely independent of the cash flows of other groups of assets and liabilities. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future net undiscounted cash flows expected to be generated by the asset group from its use and eventual disposition of that asset group. Assets are considered to be impaired if the carrying amount of an asset exceeds the future undiscounted cash flows. The impairment recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or estimated fair value less costs to sell. Intangible assets with finite lives are amortized over their estimated useful lives and evaluated with the associated long-lived asset group for impairment whenever impairment indicators exist.

Impairment of Goodwill

Goodwill is tested for impairment at least annually, or when events or changes in circumstances indicate the fair value of a reporting unit with goodwill has been reduced below its carrying amount. The Company performed its annual goodwill impairment tests for each of the reporting units within the Performance and Essential Materials and Housing and Infrastructure Products segments in the fourth quarter of 2025. See Note 7 for more information on the Company's annual goodwill impairment tests.

Equity Method Investments

The Company accounts for investments using the equity method of accounting if the Company has the ability to exercise significant influence over, but not control of, an investee. Significant influence generally exists if the Company has an ownership interest representing between 20% and 50% of the voting rights. Under the equity method of accounting, investments are stated initially at cost and are adjusted for subsequent additional investments and the proportionate share of profit or losses and distributions. The Company records its share of the profits or losses of the equity investments, net of income taxes, in the Company's consolidated statements of operations. The equity method investments are evaluated for impairment when events or changes in circumstances indicate, in management's judgment, that the carrying value of such investments may have experienced an other-than-temporary decline in value. When evidence of loss in value has occurred, management compares the estimated fair value of the investment to the carrying value of the investment to determine whether an impairment has occurred. If the estimated fair value is less than the carrying value and management considers the decline in value to be other-than-temporary, the excess of the carrying value over the estimated fair value is recognized in the consolidated financial statements as an impairment.

Other Assets, Net

Other Assets, net

Other assets, net include turnaround costs, investments in unconsolidated subsidiaries, restricted cash, deferred charges and other long-term assets.

The Company accounts for turnaround costs under the deferral method. Turnarounds are the scheduled and required shutdowns of specific operating units in order to perform planned major maintenance activities. The costs related to the significant overhaul and refurbishment activities include maintenance materials, parts and direct labor costs. The costs of the turnaround are deferred when incurred at the time of the turnaround and amortized (within depreciation and amortization) on a straight-line basis until the next planned turnaround, which typically range from three to eight years. Deferred turnaround costs are presented as a component of other assets, net. The cash outflows related to these costs are included in operating activities in the Company's consolidated statement of cash flows.

Business Combinations

The Company records business combinations using the acquisition method of accounting. Under the acquisition method of accounting, identifiable assets acquired and liabilities assumed are recorded at their acquisition date fair values. The excess of the purchase price over the estimated fair value is recorded as goodwill. Changes in the estimated fair values of net assets recorded for acquisitions prior to the finalization of more detailed analysis, but not to exceed one year from the date of acquisition, will adjust the amount of the purchase price allocable to goodwill. Measurement period adjustments are reflected in the period in which they occur.

Income Taxes

The Company utilizes the balance sheet method of accounting for deferred income taxes. Under this method, deferred tax assets or liabilities are recorded based upon temporary differences between the tax basis of assets and liabilities and their carrying values for financial reporting purposes. Deferred tax expense or benefit is the result of changes in the deferred tax assets and liabilities during the period. Valuation allowances are recorded against deferred tax assets when it is considered more likely than not that the deferred tax assets will not be realized.

Foreign Currency Translation

Assets and liabilities of foreign subsidiaries are translated to U.S. dollars at the exchange rate as of the end of the year. Statement of operations items are translated at the average exchange rate for each month of the year. The resulting translation adjustment is recorded as a separate component of stockholders' equity.

Revenue Recognition

Revenue is recognized when the Company transfers control of inventories to its customers. Amounts recognized as revenues reflect the consideration to which the Company expects to be entitled in exchange for those inventories. Provisions for discounts, rebates and returns are incorporated in the estimate of variable consideration and reflected as a reduction to revenue in the same period as the related sales.

Control of inventories generally transfers upon shipment for domestic sales. The Company excludes taxes collected on behalf of customers from the estimated contract price. For export contracts, the point at which control passes to the customer varies depending on the terms specified in the customer contract.

The Company generally invoices customers and recognizes revenue and accounts receivable upon transferring control of inventories. In limited circumstances, the Company transfers control of inventories shortly before it has an unconditional right to receive consideration, resulting in recognition of contract assets. The Company also receives advance payments from certain customers, resulting in recognition of contract liabilities. Contract assets are generally settled within the period and are not material to the consolidated balance sheets. The Company expenses sales commissions when incurred. These costs are recorded within selling, general and administrative expenses. Aside from the amounts disclosed within Note 8 and Note 18, the Company does not disclose the value of unsatisfied performance obligations because its contracts with customers (1) have an original expected duration of one year or less or (2) have only variable consideration that is calculated based on market prices at specified dates and is allocated to wholly unsatisfied performance obligations.

Revenue from Contracts with Customers ("ASC 606") requires disclosure of disaggregated revenue into categories that depict the nature of how the Company's revenue and cash flows are affected by economic factors. The Company discloses revenues by business and segment in Note 22.

Leases

The Company is obligated under various long-term and short-term operating leases for rail cars, buildings, land and other transportation and storage assets. The Company determines whether an arrangement is, or contains, a lease at contract inception. Some of the Company's arrangements contain both lease and non-lease components. For certain transportation equipment leases, the Company accounts for the lease and non-lease components as a single lease component. The Company records right-of-use assets and corresponding lease liabilities for operating leases with terms greater than one year. Operating lease right-of-use assets and liabilities are recorded at the present value of the fixed lease payments over the life of the lease. The majority of the Company's leases do not provide an implicit rate. Therefore, the Company uses its incremental borrowing rate at lease commencement to measure operating lease right-of-use assets and lease liabilities. Certain of the Company's leases provide for renewal and purchase options. Renewal and purchase options are evaluated at lease commencement and included in the lease term if they are reasonably certain to be exercised. Short-term leases are recognized in rental expense on a straight-line basis over the lease term and are not recorded in the consolidated balance sheets. The Company's finance leases are not material to the consolidated financial statements.

Transportation and Freight

Amounts billed to customers for freight and handling costs on outbound shipments are included in net sales in the consolidated statements of operations. Transportation and freight costs incurred by the Company on outbound shipments are included in cost of sales in the consolidated statements of operations.

Price Risk Management

The Company recognizes derivative instruments on the balance sheet at fair value, and changes in a derivative's fair value are currently recognized in earnings or comprehensive income, depending on the designation of the derivative. If the derivative is designated as a fair value hedge, the changes in the fair value of the derivative and of the hedged item attributable to the hedged risk are recognized in earnings. If the derivative is designated as a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in comprehensive income and is recognized in the statement of operations when the hedged item affects earnings. Ineffective portions of changes in the fair value of cash flow hedges are recognized in earnings currently. The derivative instruments did not have a material impact on the Company's consolidated financial statements.

Asset Retirement Obligations

The Company recognizes asset retirement obligations in the period in which the liability becomes probable and reasonably estimable. Recognized asset retirement obligations are initially recorded at fair value and capitalized as a component of the carrying value of the long-lived asset to which the obligation relates. The liability is accreted to its future value each period, and the capitalized cost is depreciated over the estimated useful life of the related asset. Upon settlement of the liability, a gain or loss is recorded. See Note 18 for asset retirement obligation activity during the periods presented.

The Company has conditional asset retirement obligations for the removal and disposal of hazardous materials from certain of the Company's manufacturing facilities that have not been recognized because the fair values of the conditional legal obligations cannot be measured due to the indeterminate settlement date of the obligations.

Environmental Costs

Environmental and Legal Obligations

Environmental costs relating to current operations are expensed or capitalized, as appropriate, depending on whether such costs provide future economic benefits. Environmental remediation and legal liabilities are recognized when the costs are considered probable and can be reasonably estimated. Measurement of environmental liabilities is based on currently enacted laws and regulations, existing technology and undiscounted site-specific costs. Environmental liabilities in connection with properties that are sold or closed are realized upon such sale or closure, to the extent they are probable and estimable and not previously reserved. Recognition of any joint and several liabilities is based upon the Company's best estimate of its final pro rata share of the liability. For legal loss contingencies that are not probable but reasonably possible, the Company discloses an estimate of the possible loss, range of loss or a statement that such estimate cannot be made. If the loss contingency is probable but not reasonably estimable, the Company discloses a statement that such estimate cannot be made. Estimating contingent losses is inherently subjective in nature and involves judgment and estimates. As a result, actual losses may differ, potentially materially, from recognized or disclosed estimates.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates.

Warranty Costs

The Company provides warranties for certain products, primarily under the housing and infrastructure segment, against defects in material and performance. The accrual for warranty claims is recorded at the time of sale based on historical warranty claims experience. These accruals are updated over time based on claim experience and other assessments of expected future defects and claims. Warranty liabilities are included in Accrued and other liabilities in the Company's consolidated balance sheets. See Note 18 for warranty activity during the periods presented.

Recent Accounting Pronouncements

Recently Issued Accounting Pronouncements

Accounting for Government Grants Received by Business Entities (ASU 2025-10)

In December 2025, the FASB issued an accounting standards update to establish authoritative guidance on recognition, measurement, presentation, and disclosure of government grants received by business entities. The amendments define government grants as transfers of monetary or tangible non-monetary assets from a government to a business entity (excluding exchange transactions) and leverages principles from IAS 20 while tailoring certain U.S. GAAP requirements. The amendments are effective for annual periods beginning after December 15, 2028, for public business entities, with early adoption is permitted. The transition options include modified prospective, modified retrospective, or full retrospective. The Company is in the process of evaluating the impact of this standard on the Company's consolidated financial statements.

Hedge Accounting Improvements (ASU 2025-09)

In November 2025, the FASB issued an accounting standards update to clarify and improve certain aspects of hedge accounting guidance in ASC 815. The amendments address five specific areas: (1) similar risk assessment for cash flow hedges, (2) hedging interest payments on choose-your-rate debt, (3) cash flow hedges of nonfinancial forecasted transactions, (4) net written options as hedging instruments, and (5) foreign currency-denominated debt designated as both a hedging instrument and hedged item. The amendments more closely align hedge accounting with the economics of an entity's risk management activities. The amendments are effective for annual periods beginning after December 15, 2026, for public business entities with early adoption permitted. Entities should apply the new guidance prospectively. The Company is in the process of evaluating the impact of this standard on the Company's consolidated financial statements.

Targeted Improvements to the Accounting for Internal-Use Software (ASU 2025-06)

In September 2025, the Financial Accounting Standards Board ("FASB") issued an accounting standards update to modernize the accounting for software costs to increase the operability of the recognition guidance considering different methods of software development and clarify the criteria for capitalizing software costs. The amendments are effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods, with an early adoption permitted as of the beginning of an annual reporting period. Entities should apply the new guidance either retrospectively, prospectively, or via a modified prospective transition method. The Company is in the process of evaluating the impact of this standard on the Company's consolidated financial statements.

Measurement of Credit Losses for Accounts Receivable and Contract Assets (ASU 2025-05)

In July 2025, the FASB issued an accounting standards update to add a practical expedient in developing reasonable and supportable forecasts as part of estimating expected credit losses. All entities may elect a practical expedient that assumes the current conditions as of the balance sheet date do not change for the remaining life of the asset. The amendments in this update are effective for annual reporting periods beginning after December 15, 2025 and interim reporting periods within those annual reporting periods, with early adoption permitted. Entities should apply the new guidance prospectively. The Company does not expect that this accounting standard, upon adoption, will have a material impact on the Company's consolidated financial statements.

Disaggregation of Income Statement Expenses (ASU 2024-03)

In November 2024, the FASB issued an accounting standards update requiring public entities to disclose, on an annual and interim basis, detailed information about the types of expenses in relevant expense captions presented on the face of the income statement, including amounts for inventory purchases, employee compensation, depreciation and amortization of intangible assets and a qualitative description for remaining amounts not separately disaggregated. Additionally, the update requires disclosure of total selling expenses, and in annual periods, an entity's definition of selling expenses. The amendments in this update are effective for annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027 and are to be applied either prospectively or retrospectively. The Company is currently evaluating the impact of the update on the disclosures in the Company's consolidated financial statements.

Recently Adopted Accounting Standards

Income Taxes (Topic 740): Improvements to Income Tax Disclosures (ASU No.2023-09)

In December 2023, the FASB issued an accounting standards update to enhance the transparency and decision-usefulness of income tax disclosures and to provide information to better assess how an entity's operations and related tax risks and tax planning and operational opportunities affect its tax rate and prospects for future cash flows. For public business entities, the amendments in this update are effective for annual periods beginning after December 15, 2024, with an early adoption permitted. The amendments should be applied prospectively; however, retrospective application is permitted. The Company adopted this accounting standard in the 2025 annual period and applied the standard prospectively. The adoption of this ASU resulted in additional income tax disclosures (see Note 16).

Business Combinations—Joint Venture Formations (Subtopic 805-60): Recognition and Initial Measurement (ASU 2023-05)

In August 2023, the FASB issued an accounting standards update to address the accounting for contributions made to a joint venture, upon formation, in a joint venture's financial statements, and to provide decision-useful information to investors in a joint venture's financial statements and reduce diversity in practice. Under the update, upon formation, a joint venture should recognize and initially measure its assets and liabilities at fair value (with exceptions to fair value measurement that are consistent with guidance for business combinations). The amendments in this update become effective for all joint venture formations with a formation date on or after January 1, 2025. Additionally, a joint venture that was formed before January 1, 2025 may elect to apply the amendments retrospectively if it has sufficient information. Early adoption is permitted in any interim or annual period in which financial statements have not yet been issued, either prospectively or retrospectively. The Company adopted this accounting standard effective January 1, 2025 and the adoption did not have an impact on the Company's consolidated financial statements.

Available-for-Sale Securities Policy

Available-for-Sale Securities

The investments portfolio in securities are classified as available-for-sale. The Company views its available-for-sale securities as available for use in current operations. Accordingly, the Company classifies its investments as current assets, irrespective of the maturity date. Available-for-sale securities are carried at estimated fair value with unrealized gains and losses recorded in accumulated other comprehensive income (loss), which is a separate component of stockholders' equity. Realized gains and losses and amounts reclassified out of accumulated other comprehensive income (loss) are recorded in other income in the consolidated statement of operations. The Company periodically reviews its available-for-sale securities for other-than-temporary declines in fair value below the cost basis, and when events or changes in circumstances indicate the carrying value of an asset may not be recoverable, the investment is written down to fair value, establishing a new cost basis. The Company periodically reviews available-for-sale securities to assess for credit losses based on historical experience, current conditions, investment type and other relevant market data.

Stock-Based Compensation (Performance Stock Units Assumptions) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions [Line Items]
Risk-free interest rate	4.30%	4.30%	4.00%
Expected life in years	5 years	5 years	5 years
Expected volatility	37.30%	38.40%	39.10%
Performance Stock Units
Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions [Line Items]
Risk-free interest rate	4.20%	4.50%	4.40%
Expected life in years	2 years 10 months 9 days	2 years 10 months 17 days	2 years 10 months 13 days
Expected volatility	31.60%	33.80%	40.80%
Average correlation coefficient of peer companies	0.58	0.60	0.61
Grant date fair value (in dollars per share)	$ 118.12	$ 183.39	$ 167.76
Minimum \| Performance Stock Units
Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions [Line Items]
Expected volatility of peer companies	24.70%	25.90%	26.60%
Maximum \| Performance Stock Units
Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions [Line Items]
Expected volatility of peer companies	53.20%	46.40%	53.20%

Employee Benefits (Schedule Of Change In Benefit Obligation and Change In Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
United States
Change in plan assets
Fair value of plan assets, beginning of year	$ 417
Fair value of plan assets, end of year	285	$ 417
Foreign Plan
Change in plan assets
Fair value of plan assets, beginning of year	378
Fair value of plan assets, end of year	387	378
Pension Plan \| United States
Change in benefit obligation
Benefit obligation, beginning of year	464	494
Service cost	3	4	$ 4
Interest cost	23	23	24
Actuarial loss (gain)	6	(14)
Benefits paid	(38)	(39)
Plan amendments	0	0
Curtailments	0	0
Settlements (1)	(148)	0
Foreign exchange effects	0	0
Benefit obligation, end of year	307	464	494
Change in plan assets
Fair value of plan assets, beginning of year	417	427
Actual return	54	31
Employer contribution	3	2
Benefits paid	(38)	(39)
Administrative expenses paid	(3)	(4)
Settlements (1)	(148)	0
Foreign exchange effects	0	0
Fair value of plan assets, end of year	285	417	427
Funded status, end of year	(22)	(47)
Settlement gain	32	0	0
Pension Plan \| United States \| Fixed Annuity
Change in benefit obligation
Settlements (1)	(146)
Pension Plan \| United States \| One-Time Lump Sum Payment
Change in benefit obligation
Settlements (1)	(2)
Pension Plan \| Foreign Plan
Change in benefit obligation
Benefit obligation, beginning of year	554	629
Service cost	4	4	4
Interest cost	20	19	19
Actuarial loss (gain)	(52)	(34)
Benefits paid	(26)	(23)
Plan amendments	0	0
Curtailments	(5)	0
Settlements (1)	(2)	(5)
Foreign exchange effects	68	(36)
Benefit obligation, end of year	561	554	629
Change in plan assets
Fair value of plan assets, beginning of year	378	391
Actual return	(27)	22
Employer contribution	18	16
Benefits paid	(26)	(23)
Administrative expenses paid	0	0
Settlements (1)	(2)	(5)
Foreign exchange effects	46	(23)
Fair value of plan assets, end of year	387	378	391
Funded status, end of year	(174)	(176)
Settlement gain	$ 0	$ 0	$ 0

Consolidated Statements Of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Net sales	$ 11,170	$ 12,142	$ 12,548
Cost of sales	10,357	10,185	10,329
Gross profit	813	1,957	2,219
Selling, general and administrative expenses	900	874	865
Impairment of goodwill and long-lived assets	727	0	475
Amortization of intangibles	124	117	122
Restructuring, transaction and integration-related costs	640	91	28
Income (loss) from operations	(1,578)	875	729
Other income (expense)
Interest expense	(171)	(159)	(165)
Other income, net	152	222	136
Income (loss) before income taxes	(1,597)	938	700
Income tax provision (benefit)	(126)	291	178
Net income (loss)	(1,471)	647	522
Net income attributable to noncontrolling interests	37	45	43
Net income (loss) attributable to Westlake Corporation	$ (1,508)	$ 602	$ 479
Earnings (loss) per common share attributable to Westlake Corporation:
Basic (in dollars per share)	$ (11.70)	$ 4.66	$ 3.73
Diluted (in dollars per share)	$ (11.70)	$ 4.64	$ 3.70
Weighted average common shares outstanding:
Basic (in shares)	128,260,331	128,535,226	127,806,317
Diluted (in shares)	128,260,331	129,206,922	128,598,441

Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	Commitments and Contingencies The Company is involved in a number of legal and regulatory matters that are incidental to the normal conduct of its business, including lawsuits, investigations and claims. The outcome of these matters are inherently unpredictable. The Company believes that, in the aggregate, the outcome of all known legal and regulatory matters will not have a material adverse effect on the Company's consolidated financial statements; however, under certain circumstances, if required to recognize costs in a specific period, when combined with other factors, outcomes with respect to such matters may be material to the Company's consolidated statements of operations in such period. The Company's assessment of the potential impact of environmental matters, in particular, is subject to uncertainty due to the complex, ongoing and evolving process of investigation and remediation of such environmental matters, and the potential for technological and regulatory developments. In addition, the impact of evolving claims and programs, such as natural resource damage claims, industrial site reuse initiatives and state remediation programs creates further uncertainty of the ultimate resolution of these matters. The Company anticipates that the resolution of many legal and regulatory matters, and in particular environmental matters, will occur over an extended period of time. Caustic Soda Antitrust. The Company and other caustic soda producers were named as defendants in multiple purported class action civil lawsuits filed since March 2019 in the U.S. District Court for the Western District of New York. The lawsuits allege the defendants conspired to fix, raise, maintain and stabilize the price of caustic soda, restrict domestic (U.S.) supply of caustic soda and allocate caustic soda customers, and were filed on behalf of certain named plaintiffs and a putative class comprised of either direct purchasers or indirect purchasers of caustic soda in the United States. The plaintiffs in the direct purchaser putative class and the indirect purchaser putative class sought $861 and $500, respectively, in single damages from the defendants, in addition to treble damages and attorney's fees in each case. The District Court has denied class certification for both the direct and indirect purchaser plaintiffs and the U.S. Court of Appeals for the Second Circuit denied the direct and indirect purchaser plaintiffs' petitions for leave to appeal. At this time, the Company is not able to estimate the impact that these lawsuits could have on the Company's consolidated financial statements. Beginning in October 2020, similar class action proceedings were filed in Canada on behalf of all residents of Canada who purchased caustic soda or products containing caustic soda from October 1, 2015 through the present or such date deemed appropriate by the court. The plaintiff and defendants have agreed to a combined settlement, of which the Company is responsible for paying approximately $0.35. The settlement remains subject to court approval, which is scheduled to proceed in the second quarter of 2026. The Company was also named as a defendant in a July 2023 claim now pending before the U.K. Competition Appeal Tribunal alleging that the Company and other producers sought to manipulate a third-party pricing index used in pricing sales of caustic soda, in violation of English and E.U. competition laws. The plaintiff alleges damages of approximately €80 million. At this time, the Company is not able to estimate the impact that this lawsuit could have on the Company's consolidated financial statements. Ethylene Antitrust. The Company and other ethylene consumers were the subject of a decision issued by the European Commission (Decision AT.40410 – Ethylene) on July 14, 2020 relating to the exchange of certain commercial and pricing-related information and in fixing a price element related to certain purchases of ethylene between December 2011 and March 2017 (the "European Commission Decision"). Following the decision, the Company and other ethylene consumers have been named as defendants in a series of fourteen similar lawsuits in the Netherlands and Germany by various producers and sellers of ethylene and ethylene derivatives, which generally allege that the defendants (i) conspired to lower the purchase price for ethylene and ethylene derivatives and thus (ii) caused a cartel-induced undercharge for certain ethylene and/or ethylene derivative sales to the defendants and other third parties during the period identified in the European Commission Decision and for 24 months thereafter. Certain of the lawsuits allege damages of approximately €8,738 million in the aggregate (plus statutory interest accruing from the relevant dates) while the other lawsuits seek declaratory judgments establishing that the defendants are jointly and severally liable for an unspecified amount of damages. At this time, the Company is not able to estimate the impact that these lawsuits could have on the Company's consolidated financial statements. PVC Pipe Antitrust. The Company and other manufacturers of PVC pipe and fittings have been named as defendants in ten putative class action civil lawsuits filed in Illinois between August 2024 and June 2025 and in one lawsuit in British Columbia, Canada in September 2025 which generally allege that PVC pipe and fittings manufacturers conspired with each other and an industry publication (OPIS) to fix, raise, maintain and stabilize the prices of PVC pipe and fittings in the United States and Canada, resulting in the plaintiffs paying artificially high prices for PVC pipe and fittings. The plaintiffs in these cases assert violations of various U.S. federal and state competition and consumer protection laws and Canadian competition and common laws, and seek relief including injunctive relief, damages of undisclosed amounts, and equitable relief, plus attorneys' fees and costs. In October 2025, the U.S. Department of Justice intervened and was granted a partial stay of discovery in the U.S. litigation for six months due to its ongoing antitrust investigation of manufacturers of PVC pipe and others. A class certification hearing has not yet been scheduled in the British Columbia proceeding. At this time, the Company is not able to estimate the impact that these lawsuits could have on the Company's consolidated financial statements. Brazilian Contractual Indemnification Lawsuit. In July 2012, PPG Industries, Inc. ("PPG") entered into an agreement to separate various assets and liabilities of its commodity chemicals business, which were transferred to a subsidiary of Eagle Spinco, Inc., a wholly owned subsidiary of PPG ("Eagle Spinco"). Eagle Spinco is currently a wholly owned indirect subsidiary of the Company. In May 2024, a trial court in Manaus, Brazil issued a decision awarding damages to Brazilian company Di Gregorio Navegacao, Ltda ("Di Gregorio") in a lawsuit filed by Di Gregorio against PPG relating to an explosion on November 9, 1998 that destroyed the M/V DG Harmony and her cargo, which included PPG-owned calcium hypochlorite (the "Di Gregorio Lawsuit"). The decision awarded damages to Di Gregorio in the approximate amount of R$550 million (Brazilian real), plus a monetary adjustment and interest accruing from April 3, 2006, as well as 20% for legal fees. PPG appealed the trial court's decision and the Amazonas Court of Appeals issued a decision affirming in part the trial court's decision. In November 2025, PPG filed a subsequent special appeal to Brazil's Superior Court of Justice, which is pending. In June 2024, PPG filed a lawsuit against the Company in Delaware Chancery Court asserting that the Company is responsible for any judgment in the Di Gregorio Lawsuit. The Company has asserted counterclaims against PPG seeking a declaration that the Di Gregorio Lawsuit is indemnifiable and that if PPG seeks reimbursement for any losses related to the Di Gregorio Lawsuit, it must assign to Eagle Spinco its rights to relevant insurance proceeds. At this time, the Company is not able to estimate the impact that the Delaware lawsuit and Eagle Spinco's contractual obligations related to the lawsuit could have on the Company's consolidated financial statements. Calvert City Proceedings. As the current owner of the Calvert City, Kentucky facility, the Company was named as a potentially responsible party pursuant to the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 along with Goodrich Corporation ("Goodrich") and its successor-in-interest, Avient Corporation ("Avient"). The allocation of liability for investigation and remediation costs at the Calvert City site is governed by a series of agreements between the Company, Goodrich and Avient. In March 2022, the Company filed a demand for arbitration seeking reimbursement for certain allocable costs incurred and which Avient has failed to pay or disputed under these agreements, and in November 2025, the Company and Avient agreed to expand the scope of the pending arbitration to include allocable costs incurred during the period between May 2017 and October 2025. Avient claims that the Company is liable for up to $39 of allocable costs from that period. At this time, the Company is not able to estimate the impact that these proceedings could have on the Company's consolidated financial statements. Sulphur Mines Dome. The Louisiana Department of Conservation and Energy ("LDCE", formerly known as Louisiana Department of Energy and Natural Resources) issued Compliance Order No. IMD 2022-027 and several supplements to that order, the latest in October 2023, in response to pressure anomaly events in two of the Company's salt solution-mining caverns at the Sulphur Mines Dome in Sulphur, Louisiana, which required the Company to undertake various activities related to response planning, monitoring, investigation and mitigation. Following another pressure event in June 2024, LDCE ordered the Company to take additional measures at the brine caverns, including the construction of a dome-wide containment structure. As of December 31, 2025, the Company had accrued an estimated liability of approximately $26 in connection with monitoring wells and other remedial activities, and additional compliance costs will continue to be incurred. At this time, the Company is unable to estimate the impact, if any, that other ongoing expenditures or future injunctive relief ordered by the government could have on the Company's consolidated financial statements. In November 2024, Yellow Rock LLC ("Yellow Rock") filed an amended petition in the 14th Judicial District Court of Calcasieu Parish, Louisiana alleging that the Company improperly withdrew and sold oil belonging to Yellow Rock and asserting claims of negligence and breach of duties by the Company in connection with the operation and maintenance of caverns at the Sulphur Mines Dome, alleging damages in excess of $100. In June 2025, Yellow Rock filed an additional petition in the 14th Judicial District Court of Calcasieu Parish, Louisiana alleging that the Company improperly extracted salt and brine belonging to Yellow Rock. At this time, the Company is not able to estimate the impact that these lawsuits could have on the Company's consolidated financial statements. Environmental Contingencies and Reasonably Possible Matters. As of December 31, 2025 and December 31, 2024, the Company had accrued an estimated liability for environmental contingencies totaling approximately $69 and $72, respectively, most of which was classified as noncurrent liabilities. The Company's assessment of the potential impact of these environmental contingencies is subject to considerable uncertainty due to the complex, ongoing and evolving process of investigation and, if necessary, remediation, of such environmental contingencies, and the potential for technological and regulatory developments. As such, in addition to the amounts currently reserved for contingencies that are probable and reasonably estimable as discussed above, the Company may be subject to reasonably possible loss contingencies related to environmental matters in the range of $100 to $170. Other Commitments The Company has various unconditional purchase obligations, primarily to purchase goods and services, including commitments to purchase various utilities, feedstock, nitrogen, oxygen, product storage and pipeline usage. At December 31, 2025, unrecorded unconditional total purchase obligations were $4,468, which included approximately $1,134 in 2026, $1,067 in 2027, $675 in 2028, $314 in 2029, $274 in 2030, and $1,004 thereafter.

Employee Benefits (Schedule Of Amounts Recognized In Accumulated Other Comprehensive Income (Loss)) (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive income (loss), benefits, net of tax	$ (40)	$ 44
United States
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	(64)	(79)
Prior service credit	(1)	(1)
Total before tax	(65)	(80)
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	9	23
Prior service credit	(3)	(3)
Total before tax	$ 6	$ 20

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Equity Method Investments

12 Months Ended

Dec. 31, 2025

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

LACC, LLC Joint Venture

In 2015, Eagle US 2 LLC ("Eagle"), a wholly-owned subsidiary of the Company, and Lotte Chemical USA Corporation, a subsidiary of Lotte Chemical Corporation ("Lotte"), formed a joint venture, LACC, LLC ("LACC"), to design, build and operate an ethylene facility with 2.2 billion pounds per year of ethylene production capacity. Pursuant to a contribution and subscription agreement between Eagle and LACC, Eagle contributed $225 to LACC to fund construction costs of the ethylene plant, representing approximately 12% of the membership interests in LACC. On November 12, 2019, the Company, through Eagle, completed the acquisition of an additional 34.8% of the membership interests in LACC from Lotte for approximately $817. On March 15, 2022, the Company acquired an additional 3.2% of the membership interests in LACC from Lotte for $89. As of December 31, 2025, the Company owned an aggregate 50% membership interest in LACC. As of December 31, 2025, the Company's investment exceeded the underlying equity in net assets by approximately $199 which was assigned to goodwill and not amortized.

The ethylene plant was built adjacent to the Company's chlor-alkali facility in Lake Charles. During the third quarter of 2019, the ethylene plant began commercial operations.

The members of LACC receive their proportionate shares of ethylene offtake each month and fund cash operating costs, excluding depreciation and amortization. As a result, LACC recognizes net losses equal to depreciation and amortization each period. The Company's equity in losses from LACC, which is equal to its share of depreciation and amortization expenses, is recognized in cost of sales in the consolidated statements of operations. The Company's investment in LACC is classified as an equity method investment in the consolidated balance sheets. The Company's capital contributions to fund its share of capital expenditures are classified within investing activities in the consolidated statements of cash flows.

The Company's ethylene offtake from LACC was approximately 1,056 million, 614 million, and 935 million pounds during the years ended December 31, 2025, 2024, and 2023 respectively.

For the years ended December 31, 2025, 2024 and 2023, the Company recognized sales to LACC of approximately $37, $8, and $12, respectively. Accounts receivable from this joint venture were $2 and $1 and accounts payable to this joint venture were $17 and $15 at December 31, 2025 and 2024, respectively.

Changes in the Company's investment in LACC for the years ended December 31, 2025 and 2024 were as follows:


	Investment in LACC
Balance at December 31, 2023	$	1,047
Cash contributions	22

Depreciation and amortization	(51)

Balance at December 31, 2024	1,018
Cash contributions	30

Depreciation and amortization	(57)

Balance at December 31, 2025	$	991

Services Provided to LACC and Lotte

The Company provides certain utilities and other services to LACC and Lotte. Pursuant to a construction and reimbursement agreement, LACC and Lotte agreed to reimburse the Company for construction costs over a 6.5-year period beginning in 2020. In addition to the reimbursements for construction costs, the Company charges LACC and Lotte certain fixed fees under an operating, maintenance and logistics agreement. The Company accounts for the reimbursement of construction costs and the fixed fees ratably in net sales over approximately 25 years. The remaining performance obligations under these agreements totaled $47 and $65 from LACC and Lotte, respectively, as of December 31, 2025. The associated contract liabilities recorded from LACC and Lotte totaled $32 and $40 as of December 31, 2025, respectively, and $27 and $35 as of December 31, 2024, respectively. In addition to the reimbursements for construction costs and other fixed fees, the Company charges LACC and Lotte certain variable fees that are recognized in net sales as control of the goods and services transfer to LACC and Lotte.

Other Equity Method Investments

In addition to LACC, the Company has other equity method investments amounting to $71 and $63 as of December 31, 2025 and 2024, respectively. See Note 19 for more detailed information.

Earnings and Dividends per Share (Reconciliation Of Denominator For Basic And Diluted Earnings (Loss) Per Share) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings and Dividends Per Share [Abstract]
Weighted average common shares—basic	128,260,331	128,535,226	127,806,317
Assumed exercise of options and vesting of performance stock units	0	671,696	792,124
Weighted average common shares—diluted	128,260,331	129,206,922	128,598,441
Basic (in dollars per share)	$ (11.70)	$ 4.66	$ 3.73
Diluted (in dollars per share)	$ (11.70)	$ 4.64	$ 3.70

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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-Publisher FASB
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-Name Accounting Standards Codification
-Section 55
-Paragraph 52
-Publisher FASB
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-Name Accounting Standards Codification
-Section 65
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476176/805-60-65-1

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-Paragraph 2
-Subparagraph (g)(3)
-Publisher FASB
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-3

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-Publisher FASB
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-Name Accounting Standards Codification
-Section 65
-Paragraph 1
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482689/260-10-45-2

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (d)
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
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-Subparagraph (f)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

+ Details

Goodwill and Other Intangible Assets (Amortization) (Details) $ in Millions	Dec. 31, 2025 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2026	$ 133
2027	106
2028	104
2029	95
2030	$ 78

Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2025

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule Of Estimated Future Benefit Payments

The following benefit payments are expected to be paid:


	Pension Benefits
Estimated future benefit payments:
Year 1	$	58
Year 2	57
Year 3	56
Year 4	55
Year 5	56
Years 6 to 10	275

Defined Benefit Plans

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan

Details of the changes in benefit obligations, plan assets and funded status of the Company's pension plans are as follows:


	2025				2024
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Change in benefit obligation
Benefit obligation, beginning of year	$	464	$	554	$	494	$	629

Service cost	3		4		4		4
Administrative expenses paid	(3)		—		(4)		—
Interest cost	23		20		23		19
Actuarial loss (gain)	6		(52)		(14)		(34)
Benefits paid	(38)		(26)		(39)		(23)
Plan amendments	—		—		—		—
Curtailments	—		(5)		—		—
Settlements (1)	(148)		(2)		—		(5)
Foreign exchange effects	—		68		—		(36)

Benefit obligation, end of year	$	307	$	561	$	464	$	554

Change in plan assets
Fair value of plan assets, beginning of year	$	417	$	378	$	427	$	391

Actual return	54		(27)		31		22
Employer contribution	3		18		2		16
Benefits paid	(38)		(26)		(39)		(23)
Administrative expenses paid	(3)		—		(4)		—
Settlements (1)	(148)		(2)		—		(5)
Foreign exchange effects	—		46		—		(23)
Fair value of plan assets, end of year	$	285	$	387	$	417	$	378
Funded status, end of year	$	(22)	$	(174)	$	(47)	$	(176)

______________________________

Schedule of Amounts Recognized in Balance Sheet


	2025				2024
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Amounts recognized in the consolidated balance sheet at December 31
Noncurrent assets	$	—	$	73	$	—	$	65
Current liabilities	(2)		(13)		(2)		(11)
Noncurrent liabilities	(20)		(234)		(45)		(230)
Net amount recognized	$	(22)	$	(174)	$	(47)	$	(176)

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)


	2025				2024
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Amounts recognized in accumulated other comprehensive income (loss)
Net loss (gain)	$	(64)	$	9	$	(79)	$	23
Prior service credit	(1)		(3)		(1)		(3)

Total before tax (1)	$	(65)	$	6	$	(80)	$	20

______________________________

(1)After-tax totals for pension benefits were a gain of $40 and of $44 for 2025 and 2024, respectively, and are reflected in stockholders' equity as accumulated other comprehensive income (loss).

Schedule Of Accumulated Benefit Obligations In Excess Of Plan Assets

Pension plans with an accumulated benefit obligation in excess of plan assets at December 31 are as follows:


	2025				2024
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Information for pension plans with an accumulated benefit obligation in excess of plan assets
Projected benefit obligation	$	(307)	$	(248)	$	(464)	$	(241)
Accumulated benefit obligation	(307)		(246)		(464)		(239)
Fair value of plan assets	(285)		—		417		—

Schedule Of Net Benefit Costs And Amounts Recognized In Other Comprehensive Income

The following table provides the components of net periodic benefit costs, other changes in plan assets and benefit obligation recognized in other comprehensive income.


	Year Ended December 31,
	2025				2024				2023
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Components of net periodic benefit cost
Service cost	$	3	$	4	$	4	$	4	$	4	$	4
Interest cost	23		20		23		19		24		19
Expected return on plan assets	(27)		(16)		(28)		(15)		(26)		(12)
Net amortization	(5)		—		(3)		1		(1)		(2)
Settlement gain	(32)		—		—		—		—		—
Net periodic benefit cost (gain)	$	(38)	$	8	$	(4)	$	9	$	1	$	9

Other changes in plan assets and benefit obligation recognized in other comprehensive income (OCI)
Net loss (gain) emerging	$	(22)	$	(15)	$	(16)	$	(41)	$	(36)	$	74

Amortization of prior service credit	—		—		—		1		1		—
Amortization of net gain (loss)	5		—		3		(2)		—		2
Settlement benefits	32		—		—		—		—		—
Foreign exchange effects	—		3		—		(1)		—		1
Total recognized in OCI	$	15	$	(12)	$	(13)	$	(43)	$	(35)	$	77
Total net periodic benefit cost and OCI	$	(23)	$	(4)	$	(17)	$	(34)	$	(34)	$	86

Schedule Of Weighted Average Assumptions Used

The weighted-average assumptions used to determine pension plan obligations and net periodic benefit costs for the plans are as follows:


	2025				2024				2023
	U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans		U.S. Plans		Non-U.S. Plans
Weighted average assumptions used to determine benefit obligations at December 31
Discount rate	5.2	%	4.2	%	5.5	%	3.5	%	5.0	%	3.2	%
Rate of compensation increase	—	%	3.0	%	—	%	3.0	%	—	%	3.1	%
Weighted average assumptions used to determine net periodic benefit costs for years ended December 31
Discount rate for benefit obligations	5.5	%	3.5	%	5.0	%	3.2	%	4.9	%	3.7	%
Discount rate for service cost	5.4	%	3.7	%	5.0	%	3.6	%	5.0	%	3.8	%
Discount rate for interest cost	5.2	%	3.5	%	5.0	%	3.2	%	4.8	%	3.7	%
Expected return on plan assets	7.0	%	4.0	%	7.0	%	4.0	%	6.5	%	3.3	%
Rate of compensation increase	—	%	3.0	%	—	%	3.1	%	—	%	2.9	%

Schedule Of Fair Value Of Pension Plan Assets


	2025
	U.S. Plans								Non-U.S. Plans
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash and common stock:
Cash and cash equivalents	$	—	$	—	$	—	$	—	$	6	$	—	$	—	$	6

Collective investment trust and mutual funds—Equity securities:
Large-cap funds (1)	21		76		—		97		—		2		—		2
Small-cap funds (2)	—		7		—		7		—				—		—
International funds (3)	29		14		—		43		—		76		—		76
Collective investment trust and mutual funds—Fixed income:
Bond funds (4)	7		124		—		131		—		296		—		296
Short-term investment funds	—		7		—		7		—		—		—		—
Group insurance contract	—		—		—		—		—		—		7		7
	$	57	$	228	$	—	$	285	$	6	$	374	$	7	$	387


	2024
	U.S. Plans								Non-U.S. Plans
	Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3		Total
Cash and common stock:
Cash and cash equivalents	$	—	$	—	$	—	$	—	$	4	$	—	$	—	$	4

Collective investment trust and mutual funds—Equity securities:
Large-cap funds (1)	31		112		—		143		—		1		—		1
Small-cap funds (2)	—		9		—		9		—		—		—		—
International funds (3)	41		20		—		61		—		74		—		74
Collective investment trust and mutual funds—Fixed income:
Bond funds (4)	10		181		—		191		—		292		—		292
Short-term investment funds	—		13		—		13		—		—		—		—
Group insurance contract	—		—		—		—		—		—		7		7
	$	82	$	335	$	—	$	417	$	4	$	367	$	7	$	378

______________________________

(1)Substantially all of the assets of these funds are invested in large-cap U.S. companies. The remainder of the assets of these funds is invested in cash reserves.

(2)Substantially all of the assets of these funds are invested in small-cap U.S. companies. The remainder of the assets of these funds is invested in cash reserves.

Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2025

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss) by component were as follows:


	Pension and Other Post-Retirement Benefits Liability, Net of Tax		Cumulative Foreign Currency Exchange, Net of Tax		Available-for-sale Securities, Net of Tax		Total
Balances at December 31, 2022	$	52	$	(141)	$	—	$	(89)
Net other comprehensive income (loss) attributable to Westlake Corporation	(48)		39		—		(9)
Balances at December 31, 2023	4		(102)		—		(98)


Net other comprehensive income (loss) attributable to Westlake Corporation	50		(96)		—		(46)
Balances at December 31, 2024	54		(198)		—		(144)
Other comprehensive income (loss) before reclassifications	(34)		73		1		40
Amounts reclassified from accumulated other comprehensive income (loss)	24		—		—		24
Net other comprehensive income (loss) attributable to Westlake Corporation	(10)		73		1		64
Balances at December 31, 2025	$	44	$	(125)	$	1	$	(80)

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Loss Carryforwards [Line Items]
Unrecognized Tax Benefits	$ 42	$ 42	$ 35	$ 24
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	6	4	3
Change in state apportionment and tax rates		45	(6)
Valuation allowance	298	$ 170	$ 118	$ 47
Change in valuation allowance	128
Subject to Expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	14
Not Subject to Expiration
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	16
Federal
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	611
Tax Credit Carryforward, Amount	2
Foreign Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,228
Foreign Tax Jurisdiction \| Subject to Expiration
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	42
Foreign Tax Jurisdiction \| Not Subject to Expiration
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,186
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	1,683
Tax Credit Carryforward, Amount	28
State and Local Jurisdiction \| Subject to Expiration
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	713
State and Local Jurisdiction \| Not Subject to Expiration
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 970

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Current assets
Cash and cash equivalents	$ 2,724	$ 2,919
Available-for-sale securities	204	0
Accounts receivable, net	1,504	1,483
Inventories	1,653	1,697
Prepaid expenses and other current assets	131	115
Total current assets	6,216	6,214
Property, plant and equipment, net	8,605	8,633
Operating lease right-of-use assets	798	801
Goodwill	1,314	2,031
Customer relationships, net	743	820
Other intangible assets, net	439	462
Equity method investments	1,062	1,081
Other assets, net	784	708
Total assets	19,961	20,750
Current liabilities
Accounts payable	783	851
Accrued and other liabilities	1,490	1,362
Current portion of long-term debt, net	497	6
Total current liabilities	2,770	2,219
Long-term debt, net	5,087	4,556
Deferred income taxes	1,343	1,553
Pension and other post-retirement benefits	286	304
Operating lease liabilities	688	713
Other liabilities	492	362
Total liabilities	10,666	9,707
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.01 par value, 50,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.01 par value, 300,000,000 shares authorized; 134,651,380 and 134,651,380 shares issued at December 31, 2025 and 2024, respectively	1	1
Common stock, held in treasury, at cost; 6,740,232 and 6,424,366 shares at December 31, 2025 and 2024, respectively	(513)	(467)
Additional paid-in capital	683	656
Retained earnings	8,701	10,481
Accumulated other comprehensive loss	(80)	(144)
Total Westlake Corporation stockholders' equity	8,792	10,527
Noncontrolling interests	503	516
Total equity	9,295	11,043
Total liabilities and equity	$ 19,961	$ 20,750

Accounts Payable

12 Months Ended

Dec. 31, 2025

Payables and Accruals [Abstract]

Accounts Payable

Accounts payable consisted of the following at December 31:


	2025		2024
Accounts payable—third parties	$	737	$	806
Accounts payable to related parties	18		16
Notes and other short-term payable	28		29
Accounts payable	$	783	$	851

Subsequent Events (Details) € in Millions	Jan. 05, 2026 EUR (€)
Subsequent Event \| ACI
Subsequent Event [Line Items]
Business Combination, Consideration Transferred	€ 92.4

Supplemental Information

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Information

Contract Liabilities and Remaining Performance Obligations

In May 2022, the Company entered into a chlorine and hydrogen chloride exchange contract with one of its customers. In the third quarter of 2025, the Company received an up-front payment of $70, representing a fixed portion of the total transaction price. The up-front fee was recorded as a contract liability and will be recognized ratably in net sales over the 20-year contract period. In addition to the fixed portion of the transaction price, the Company charges certain variable fees under the contract.

The total contract liabilities, primarily included in other liabilities on the balance sheet, were as follows:


	Year Ended December 31,
	2025		2024		2023
Balance at January 1,	$	62	$	52	$	42
Revenues recognized that were included in the contract liability balances at the beginning of the period	(5)		(5)		(5)
Increases due to cash received and due, excluding amounts recognized as revenues during the period	90		15		15
Balance at December 31,	$	147	$	62	$	52

As of December 31, 2025, the remaining performance obligations were $187, representing the fixed components of the transaction price, expected to be recognized over the remaining term of the Company's revenue contracts.

Asset Retirement Obligations

The asset retirement obligations activity for the years ended December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025		2024		2023
Beginning balance, January 1,	$	81	$	40	$	31
Liabilities incurred	152		25		3
Liabilities settled	(59)		(7)		(2)
Accretion expense	1		3		1
Revisions of previous estimates	13		21		7
Effects of exchange rate changes	6		(1)		—
Ending balance, December 31,	$	194	$	81	$	40
Recorded as accrued and other liabilities	$	119	$	39	$	3
Recorded as other liabilities	$	75	$	42	$	37

Warranty Costs

The warranty liabilities activity for the years ended December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025		2024		2023
Beginning balance, January 1,	$	73	$	69	$	58

Warranty provisions	35		19		24

Warranty claims paid	(27)		(15)		(13)

Ending balance, December 31,	$	81	$	73	$	69

Accrued and Other Liabilities

Accrued and other liabilities were $1,490 and $1,362 at December 31, 2025 and 2024, respectively. Accrued rebates and accrued operating lease liability, which are components of accrued and other liabilities, were $225 and $138 at December 31, 2025 and $232 and $128 at December 31, 2024, respectively. No other component of accrued and other liabilities was more than five percent of total current liabilities. Accrued liabilities with related parties were $31 and $26 at December 31, 2025 and 2024, respectively.

Non-cash Investing Activity

Capital expenditure related liabilities, included in accounts payable and accrued and other liabilities, were $128, $157, and $184 at December 31, 2025, 2024, and 2023, respectively.

Restructuring, Transaction and Integration-related Costs

For the years ended December 31, 2025, 2024 and 2023, the restructuring, transaction and integration-related costs were $640, $91 and $28, respectively. The costs in 2025 primarily consisted of North American chlorovinyls and Styrene plants closure costs of $386, Pernis plant closure costs of $232, and Huasu PVC unit closure costs of $9. The restructuring, transaction and integration-related costs in 2024 were primarily related to Pernis plant mothballing costs of $75. The restructuring, transaction and integration-related costs in 2023 were primarily related to plant closures resulting from the Company's manufacturing footprint optimization efforts.

Pernis Facility Closure

In July 2024, the Company approved a plan to mothball the AC and ECH units at the Pernis facility and recognized charges of approximately $75 related to mothballing of the AC and ECH units in the third quarter of 2024. The Company continued to operate the liquid and solid epoxy resin ("LER/SER") and bisphenol A ("BPA") units at the Pernis facility through June 2025. In June 2025, due to the continued deterioration of the Company's commodity epoxy business in Europe, the Company revised the original mothballing plan and approved a plan to close and cease all the remaining operations at its Pernis facility including the LER/SER and BPA units. The Company ceased the BPA unit operations in June 2025 and ceased the LER/SER unit operations in October 2025.

The total costs recognized during the twelve months ended December 31, 2025 of $247 consisted of charges for asset retirement obligations of $98, employee severance and separation costs of $23 and contract termination and other plant closure costs of $111 that are included in the restructuring, transaction and integration-related costs, and the write-down of inventory of $15 that is included in the cost of sales in the Company's consolidated statements of operations and Performance and Essential Materials segment operating results. The contract termination costs include liquidated damages, costs for services without future economic benefits, leases, and other costs associated with the plant shutdown. The Company expects to recognize additional charges related to other plant shutdown costs of $3 and severance and separation costs of $7 in future periods in connection with the closures. The Company expects to complete the closure plan in 2030. Asset retirement obligations and plant shutdown costs recorded represent management's best estimate based on information currently available and are subject to change as additional information becomes available.

The following table sets forth the asset write-downs and the accrual activity related to the closure of the Pernis facility included in accrued and other liabilities, and other liabilities in the Company's consolidated balance sheets and the cumulative charges recognized:


	Asset Write-offs		Asset Retirement Obligations		Severance and Separation Costs		Contract Termination and Other Costs		Total
2024 charges and change in estimates	$	—	$	24	$	4	$	47	$	75

Foreign currency translation			(1)		—		(3)		(4)
Balances at December 31, 2024	—		23		4		44		71















2025 charges and change in estimates	15		98		23		111		247
Cash paid	—		(26)		(3)		(60)		(89)
Inventory write-downs	(15)		—		—		—		(15)
Foreign currency translation	—		4		1		7		12
Balance at December 31, 2025	$	—	$	99	$	25	$	102	$	226
Cumulative charges recognized as of December 31, 2025	$	15	$	122	$	27	$	158	$	322

Certain Chlorovinyls Facilities and Styrene Facility Closures

In December 2025, the Company approved a plan to cease operation of certain of the Company's North American chlorovinyls production facilities, including (i) its polyvinyl chloride ("PVC") plant at the Aberdeen, Mississippi facility, which had an annual capacity of approximately 1 billion pounds of suspension PVC, (ii) its vinyl chloride monomer ("VCM") plant at the Lake Charles, Louisiana North facilities, which had an annual capacity of approximately 910 million pounds of VCM, and (iii) one of its diaphragm chlor-alkali units at the Lake Charles, Louisiana South facilities, which had an annual capacity of approximately 825 million pounds of chlorine and 910 million pounds of caustic soda, as well as (iv) Company's styrene production plant located at the Lake Charles, Louisiana facilities, which had an annual production capacity of approximately 570 million pounds of styrene. The total costs recognized by the Company and reflected in the consolidated statement of operations and Performance and Essential Materials segment operating results in 2025 as a result of these closures was $393, of which $386 was included in the restructuring, transaction and integration-related costs and $7 related to a write-down of inventory was included in the cost of sales in the consolidated statements of operations. The total cost included a non-cash charge of $317, representing accelerated depreciation, accelerated amortization and asset write-offs. The Company expects to recognize additional charges related to severance and separation costs of $4 and other plant shutdown costs of $21 in future periods in connection with these closures. The Company expects to complete the closure plan for such facilities in 2027. Asset retirement obligations and plant shutdown costs recorded represent management's best estimate based on information currently available and are subject to change as additional information becomes available.

The following table sets forth the asset write-downs, accelerated depreciation and amortization, and the accrual activity related to the closure of the Chlorovinyls and Styrene facilities included in accrued and other liabilities, and other liabilities in the Company's consolidated balance sheets:


	Assets Write-offs		Accelerated Depreciation and Amortization		Asset Retirement Obligations		Severance and Separation Costs		Other Plant Shutdown Costs		Total
2025 charges	$	30	$	287	$	52	$	17	$	7	$	393

Property, plant and equipment	(23)		(259)		—		—		—		(282)
Other assets	—		(28)		—		—		—		(28)
Inventory write-downs	(7)		—		—		—		—		(7)

Balance at December 31, 2025	$	—	$	—	$	52	$	17	$	7	$	76

Other Income, Net

For the year ended December 31, 2025, other income, net included interest income, pension gain and income from unconsolidated subsidiaries of $100, $32 and $16, respectively. For the year ended December 31, 2024, other income, net included interest income, proceeds from a sale of land and income from unconsolidated subsidiaries of $153, $19 and $18, respectively. For the year ended December 31, 2023, other income, net included interest income, insurance recoveries and income from unconsolidated subsidiaries of $104, $28 and $19, respectively.

Operating Lease Supplemental Cash Flow

Supplemental cash flow information related to leases was as follows:


	Year Ended December 31,
	2025		2024		2023
Operating cash flows from operating leases (1)	$	177	$	154	$	139
Right-of-use assets obtained in exchange for operating lease obligations	141		246		240

______________________________

(1) Includes cash paid for amounts included in the measurement of operating lease liabilities recorded in the consolidated balance sheets.

Cash Flow Information


	Year Ended December 31,
	2025		2024		2023
Cash paid for:
Interest paid, net of interest capitalized	$	157	$	153	$	159
Income taxes paid	104		422		421

Accounts Receivable

12 Months Ended

Dec. 31, 2025

Receivables [Abstract]

Accounts Receivable

Accounts receivable consisted of the following at December 31:


	2025		2024
Trade customers	$	1,254	$	1,339
Related parties	2		3
Allowance for credit losses	(27)		(27)
	1,229		1,315
Federal and state taxes	158		68
Other	117		100
Accounts receivable, net	$	1,504	$	1,483

Employee Benefits (Schedule Of Net Benefit Costs, Other Changes in Plan Assets and Benefit Obligation Recognized In Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Expected net loss, Next Fiscal Year	$ (1)
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	(7)
United States \| Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	$ 4	$ 4
Interest cost	23	23	24
Expected return on plan assets	(27)	(28)	(26)
Net amortization	(5)	(3)	(1)
Settlement gain	32	0	0
Net periodic benefit cost (gain)	(38)	(4)	1
Net loss (gain) emerging	(22)	(16)	(36)
Amortization of prior service credit	0	0	1
Amortization of net gain (loss)	5	3	0
Prior service credit	32	0	0
Foreign exchange effects	0	0	0
Total recognized in OCI	15	(13)	(35)
Total net periodic benefit cost and OCI	(23)	(17)	(34)
Foreign Plan \| Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	4	4	4
Interest cost	20	19	19
Expected return on plan assets	(16)	(15)	(12)
Net amortization	0	1	(2)
Settlement gain	0	0	0
Net periodic benefit cost (gain)	8	9	9
Net loss (gain) emerging	(15)	(41)	74
Amortization of prior service credit	0	1	0
Amortization of net gain (loss)	0	(2)	2
Prior service credit	0	0	0
Foreign exchange effects	3	(1)	1
Total recognized in OCI	(12)	(43)	77
Total net periodic benefit cost and OCI	$ (4)	$ (34)	$ 86

Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2025

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss) by component were as follows:


	Pension and Other Post-Retirement Benefits Liability, Net of Tax		Cumulative Foreign Currency Exchange, Net of Tax		Available-for-sale Securities, Net of Tax		Total
Balances at December 31, 2022	$	52	$	(141)	$	—	$	(89)
Net other comprehensive income (loss) attributable to Westlake Corporation	(48)		39		—		(9)
Balances at December 31, 2023	4		(102)		—		(98)


Net other comprehensive income (loss) attributable to Westlake Corporation	50		(96)		—		(46)
Balances at December 31, 2024	54		(198)		—		(144)
Other comprehensive income (loss) before reclassifications	(34)		73		1		40
Amounts reclassified from accumulated other comprehensive income (loss)	24		—		—		24
Net other comprehensive income (loss) attributable to Westlake Corporation	(10)		73		1		64
Balances at December 31, 2025	$	44	$	(125)	$	1	$	(80)

The amount of $24, net of tax of $8, represents a realized gain on settlement of a portion of pension benefits liability in 2025.

Description of Business and Significant Accounting Policies (Schedule Of Estimated Useful Lives Of Assets) (Details)	Dec. 31, 2025
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, minimum (in years)	40 years
Minimum \| Plant and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, minimum (in years)	10 years
Minimum \| Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, minimum (in years)	3 years
Maximum \| Plant and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, minimum (in years)	25 years
Maximum \| Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life, minimum (in years)	15 years

Leases

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Leases

Lease-related asset and liability balances consisted of the following at December 31:


	2025			2024
Operating Leases
Right-of-use assets	$	798		$	801

Accrued and other liabilities	$	138		$	128
Operating lease liabilities	688			713
Total operating lease liabilities	$	826		$	841

Weighted Average Remaining Term (in years)	8			9
Weighted Average Lease Discount Rate	4.4		%	4.2		%

The Company's operating lease cost is comprised of payments related to operating leases recorded in the Company's consolidated balance sheet and short-term rental payments for leases that are not recorded in the consolidated balance sheet.

The components of operating lease expense were as follows:


	Year Ended December 31,
	2025		2024		2023
Operating lease cost (1)	$	178	$	162	$	142
Short-term lease cost	128		131		121
Total operating lease cost	$	306	$	293	$	263

_____________________________

(1)Includes fixed lease payments for operating leases recorded in the consolidated balance sheet.

Maturities of lease liabilities were as follows at December 31, 2025:


	Operating Leases
2026	$	166
2027	155
2028	138
2029	116
2030	92
Thereafter	346
Total lease payments	1,013
Less: imputed interest	(187)
Present value of lease liabilities	$	826

Related Party Leases

The Company leases certain assets under operating leases with related parties. Right-of-use assets and the associated operating lease liabilities for related party operating leases were approximately $47 and $47 as of December 31, 2025 and December 31, 2024, respectively. The Company recognized operating lease cost for fixed lease payments to related parties of $6 and $6 for the years ended December 31, 2025 and 2024, respectively.

Accounts Payable (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Notes and other short-term payable	$ 28	$ 29
Accounts payable	783	851
Nonrelated Party
Related Party Transaction [Line Items]
Accounts payable—third parties	737	806
Related Party
Related Party Transaction [Line Items]
Accounts payable—third parties	$ 18	$ 16

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

Supplemental Information (Tables)

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Contract with Customer, Contract Asset, Contract Liability, and Receivable

The total contract liabilities, primarily included in other liabilities on the balance sheet, were as follows:


	Year Ended December 31,
	2025		2024		2023
Balance at January 1,	$	62	$	52	$	42
Revenues recognized that were included in the contract liability balances at the beginning of the period	(5)		(5)		(5)
Increases due to cash received and due, excluding amounts recognized as revenues during the period	90		15		15
Balance at December 31,	$	147	$	62	$	52

Schedule of Cash Flow Information

Operating Lease Supplemental Cash Flow

Supplemental cash flow information related to leases was as follows:


	Year Ended December 31,
	2025		2024		2023
Operating cash flows from operating leases (1)	$	177	$	154	$	139
Right-of-use assets obtained in exchange for operating lease obligations	141		246		240

______________________________

(1) Includes cash paid for amounts included in the measurement of operating lease liabilities recorded in the consolidated balance sheets.

Cash Flow Information


	Year Ended December 31,
	2025		2024		2023
Cash paid for:
Interest paid, net of interest capitalized	$	157	$	153	$	159
Income taxes paid	104		422		421

Restructuring and Related Costs


	Asset Write-offs		Asset Retirement Obligations		Severance and Separation Costs		Contract Termination and Other Costs		Total
2024 charges and change in estimates	$	—	$	24	$	4	$	47	$	75

Foreign currency translation			(1)		—		(3)		(4)
Balances at December 31, 2024	—		23		4		44		71















2025 charges and change in estimates	15		98		23		111		247
Cash paid	—		(26)		(3)		(60)		(89)
Inventory write-downs	(15)		—		—		—		(15)
Foreign currency translation	—		4		1		7		12
Balance at December 31, 2025	$	—	$	99	$	25	$	102	$	226
Cumulative charges recognized as of December 31, 2025	$	15	$	122	$	27	$	158	$	322


	Assets Write-offs		Accelerated Depreciation and Amortization		Asset Retirement Obligations		Severance and Separation Costs		Other Plant Shutdown Costs		Total
2025 charges	$	30	$	287	$	52	$	17	$	7	$	393

Property, plant and equipment	(23)		(259)		—		—		—		(282)
Other assets	—		(28)		—		—		—		(28)
Inventory write-downs	(7)		—		—		—		—		(7)

Balance at December 31, 2025	$	—	$	—	$	52	$	17	$	7	$	76

Schedule of Asset Retirement Obligations

The asset retirement obligations activity for the years ended December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025		2024		2023
Beginning balance, January 1,	$	81	$	40	$	31
Liabilities incurred	152		25		3
Liabilities settled	(59)		(7)		(2)
Accretion expense	1		3		1
Revisions of previous estimates	13		21		7
Effects of exchange rate changes	6		(1)		—
Ending balance, December 31,	$	194	$	81	$	40
Recorded as accrued and other liabilities	$	119	$	39	$	3
Recorded as other liabilities	$	75	$	42	$	37

Schedule of Warranty Liabilities

The warranty liabilities activity for the years ended December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025		2024		2023
Beginning balance, January 1,	$	73	$	69	$	58

Warranty provisions	35		19		24

Warranty claims paid	(27)		(15)		(13)

Ending balance, December 31,	$	81	$	73	$	69

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill

The following table summarizes changes in goodwill for the years ended December 31, 2025 and 2024 :


	Housing and Infrastructure Products Segment		Performance and Essential Materials Segment		Total
Balance at December 31, 2023	$	1,144	$	897	$	2,041
Effects of changes in foreign exchange rates	(6)		(4)		(10)
Balance at December 31, 2024	1,138		893		2,031
Impairment of goodwill	—		(727)		(727)
Effects of changes in foreign exchange rates	7		3		10
Balance at December 31, 2025	$	1,145	$	169	$	1,314

The goodwill balance is presented net of accumulated impairment losses of $855 as of December 31, 2025, and $128 as of December 31, 2024 and 2023 in the Performance and Essential Materials segment.

Goodwill Impairment

Goodwill is evaluated for impairment when events or changes in circumstances indicate the fair value of a reporting unit with goodwill has been reduced below its carrying amount, and otherwise at least annually.

As part of the Company's continuous assessment of changes in the macroeconomic environment in the performance and essential materials industry and recent operating performance and updated forecasts, the Company identified triggering events associated with the North American Chlorovinyls reporting unit in the third quarter of 2025. Due to the recent operating losses and downward revision in the third quarter 2025 of forecasts for the North American Chlorovinyls reporting unit along with negative chlorovinyls industry trends, the Company performed a quantitative assessment in the third quarter of 2025 to determine if the fair value of this reporting unit had reduced below its carrying amount. The Company also performed a quantitative impairment assessment in the third quarter of 2025 for all other reporting units within the Performance and Essential Materials and the Housing and Infrastructure Products segments to assess the overall fair value of the Company as compared to its market capitalization.

The fair values of the reporting units, including the North American Chlorovinyls reporting unit, were determined using a weighting of both a discounted cash flow methodology and a market value methodology. The fair values of the Company's reporting units were classified as Level 3 of the fair value hierarchy due to the significance of unobservable inputs developed using company-specific information. Both of these methodologies require estimates, assumptions, and judgments about future results. The Company's analysis is based on the Company's internally developed long-range plan, which is developed from historical results, estimates by management of future market conditions, current and future strategic and operational plans and future financial performance. Significant assumptions used in the Company's discounted cash flow methodology include projected sales volumes based on production capacities and operating rates, product selling prices, capital expenditures, depreciation expense, working capital investment, discount rates, tax rates, terminal growth rates and earnings before interest expense, income taxes, depreciation and amortization expense (EBITDA) margin, inclusive of feedstock, energy and power costs. Significant assumptions used in the Company's market value methodology include EBITDA, weighting of periods, market participant acquisition premium and the estimated multiples of EBITDA buyers are willing to pay in the marketplace.

Based on the quantitative tests performed during the third quarter of 2025, the Company determined that the fair value of the North American Chlorovinyls reporting unit did not exceed its carrying amount. This resulted in a non-cash goodwill impairment charge of $727 taken in the third quarter of 2025, representing all the goodwill associated with the North American Chlorovinyls reporting unit recognized within the Performance and Essential Materials segment. The goodwill impairment charge is reported as impairment of goodwill in the consolidated statements of operations. For all other reporting units, the Company determined that the fair values of each of the reporting units were in excess of the carrying amounts.

The Company performed a qualitative assessment for the purposes of its 2025 annual goodwill impairment analysis for each of the reporting units within the Housing and Infrastructure Products and the Performance and Essential Materials and segments during the fourth quarter of 2025. Based on the qualitative assessment performed in the fourth quarter of 2025, the Company determined it was more likely than not that the fair value of each reporting unit with goodwill exceeds its carrying value. If the judgments and estimates used in the Company's analysis are not realized or change due to future external factors, then actual results may not be consistent with these judgments and estimates, and the Company's goodwill may become further impaired in future periods, which could have an adverse effect on the Company's financial condition and results of operations.

In 2023, the Company performed a quantitative assessment for the purposes of its 2023 annual goodwill impairment analysis for each of the reporting units within the Performance and Essential Materials and the Housing and Infrastructure Products segments. The discounted cash flow projections were based on a long-term forecast to reflect the cyclicality of the business. The forecast is based on historical results, estimates by management of future market conditions, current and future strategic and operational plans and future financial performance. Significant assumptions used in the discounted cash flow projection included projected sales volumes based on production capacities, future sales prices, feedstock, energy and power costs and capital expenditures to maintain safe and reliable plant operations. The future cash flows were discounted to present value using a discount rate ranging from 10.0% to 12.0%. The significant assumptions used in determining the fair value of the reporting unit using the market value methodology include the determination of appropriate market comparables and the estimated multiples of net income before interest expense, income taxes, depreciation and amortization a willing buyer is likely to pay. Based on the quantitative tests performed during the fourth quarter of 2023, the Company determined that the fair value of the Westlake Epoxy reporting unit did not exceed its carrying amount, and as such, a goodwill impairment charge of $128 was recognized within the Performance and Essential Materials segment. The goodwill impairment charge was reported in impairment of goodwill and long-lived assets in the 2023 consolidated statements of operations.

Intangible Assets

Intangible assets consisted of the following at December 31:


	2025						2024						Weighted Average Life
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Customer relationships	$	1,582	$	(839)	$	743	$	1,570	$	(750)	$	820	15
Other intangible assets:
Licenses and intellectual property	266		(149)		117		260		(138)		122		15
Trade name	388		(140)		248		381		(120)		261		18
Other	116		(42)		74		106		(27)		79		17
Total other intangible assets	$	770	$	(331)	$	439	$	747	$	(285)	$	462

Scheduled amortization of intangible assets for the next five years is as follows: $133, $106, $104, $95 and $78 in 2026, 2027, 2028, 2029 and 2030, respectively.

Employee Benefits (Multiemployer Plans) (Details)	12 Months Ended
Employee Benefits (Multiemployer Plans) (Details)	Dec. 31, 2025 plan
Multiemployer Plans [Line Items]
Number of multiemployer plans	2

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480576/715-80-50-6

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480576/715-80-50-5

Reference 4: http://www.xbrl.org/2003/role/exampleRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/exampleRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480576/715-80-50-5

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480576/715-80-50-5

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Paragraph 5
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480576/715-80-50-9

+ Details

Segment and Geographic Information (Segment Reporting Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net sales	$ 11,170	$ 12,142	$ 12,548
Cost of sales	10,357	10,185	10,329
Income (loss) from operations	(1,578)	875	729
Depreciation and amortization	1,178	1,114	1,097
Other income, net	152	222	136
Provision for (benefit from) income taxes	(126)	291	178
Capital expenditures	995	1,008	1,034
Operating Segments
Segment Reporting Information [Line Items]
Net sales	11,170	12,142	12,548
Income (loss) from operations	(1,513)	936	769
Depreciation and amortization	1,165	1,105	1,088
Other income, net	62	95	57
Provision for (benefit from) income taxes	(148)	404	131
Capital expenditures	984	1,006	1,021
Operating Segments \| Performance and Essential Materials Segment
Segment Reporting Information [Line Items]
Net sales	7,022	7,825	8,336
Raw material, energy and manufacturing costs	6,827	6,808	6,926
Depreciation and amortization	881	838	823
Cost of sales	7,708	7,646	7,749
Selling, general and administrative expenses	416	394	401
Depreciation and amortization SG&A	53	54	58
Impairment of goodwill and long-lived assets	727	0	475
Restructuring, transaction and integration-related costs	624	86	2
Income (loss) from operations	(2,100)	129	59
Depreciation and amortization	934	892	881
Other income, net	57	65	25
Provision for (benefit from) income taxes	(310)	68	(63)
Capital expenditures	795	821	857
Operating Segments \| Performance and Essential Materials Segment \| Performance Materials
Segment Reporting Information [Line Items]
Net sales	4,018	4,626	4,656
Operating Segments \| Performance and Essential Materials Segment \| Essential Materials
Segment Reporting Information [Line Items]
Net sales	3,004	3,199	3,680
Operating Segments \| Housing and Infrastructure Products Segment
Segment Reporting Information [Line Items]
Net sales	4,148	4,317	4,212
Raw material, energy and manufacturing costs	2,898	2,882	2,873
Depreciation and amortization	154	138	132
Cost of sales	3,052	3,020	3,005
Selling, general and administrative expenses	416	410	400
Depreciation and amortization SG&A	77	75	75
Impairment of goodwill and long-lived assets	16	5	22
Income (loss) from operations	587	807	710
Depreciation and amortization	231	213	207
Other income, net	5	30	32
Provision for (benefit from) income taxes	162	336	194
Capital expenditures	189	185	164
Operating Segments \| Housing and Infrastructure Products Segment \| Housing Products
Segment Reporting Information [Line Items]
Net sales	3,513	3,644	3,494
Operating Segments \| Housing and Infrastructure Products Segment \| Infrastructure Products
Segment Reporting Information [Line Items]
Net sales	635	673	718
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales	406	484	408
Intersegment Eliminations \| Performance and Essential Materials Segment
Segment Reporting Information [Line Items]
Net sales	406	484	408
Corporate and other
Segment Reporting Information [Line Items]
Income (loss) from operations	(65)	(61)	(40)
Depreciation and amortization	13	9	9
Other income, net	90	127	79
Provision for (benefit from) income taxes	22	(113)	47
Capital expenditures	$ 11	$ 2	$ 13

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

Intangible assets consisted of the following at December 31:


	2025						2024						Weighted Average Life
	Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Customer relationships	$	1,582	$	(839)	$	743	$	1,570	$	(750)	$	820	15
Other intangible assets:
Licenses and intellectual property	266		(149)		117		260		(138)		122		15
Trade name	388		(140)		248		381		(120)		261		18
Other	116		(42)		74		106		(27)		79		17
Total other intangible assets	$	770	$	(331)	$	439	$	747	$	(285)	$	462

Schedule of Goodwill

The following table summarizes changes in goodwill for the years ended December 31, 2025 and 2024 :


	Housing and Infrastructure Products Segment		Performance and Essential Materials Segment		Total
Balance at December 31, 2023	$	1,144	$	897	$	2,041
Effects of changes in foreign exchange rates	(6)		(4)		(10)
Balance at December 31, 2024	1,138		893		2,031
Impairment of goodwill	—		(727)		(727)
Effects of changes in foreign exchange rates	7		3		10
Balance at December 31, 2025	$	1,145	$	169	$	1,314

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-2

+ Details

Long-Term Debt (Senior Notes) (Details) - USD ($) $ in Millions		12 Months Ended
	Nov. 12, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Aug. 10, 2016
Credit Agreement [Line Items]
Repayment of senior notes		$ 254	$ 300	$ 0
Long-term debt, principal amount		$ 5,680	4,645
5.550% Senior Notes Due 2035 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		5.55%
Long-term debt, principal amount		$ 600	0
6.375% Senior Notes Due 2055 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		6.375%
Long-term debt, principal amount		$ 600	0
3.60% Senior Notes Due 2026 \| Senior Notes
Credit Agreement [Line Items]
Repayment of senior notes	$ 254
Stated interest rate (percent)		3.60%
Percentage of principal amount redeemed	99.63%
Long-term debt, principal amount		$ 496	750		$ 750
3.375% Senior Notes Due 2030 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		3.375%
Long-term debt, principal amount		$ 300	300
1.625% Senior Notes Due 2029 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		1.625%
Long-term debt, principal amount		$ 822	727
3.50% Senior Notes Due 2032 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		3.50%
Long-term debt, principal amount		$ 250	250
2.875% Senior Notes Due 2041 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		2.875%
Long-term debt, principal amount		$ 350	350
5.00% Senior Notes Due 2026 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		5.00%
Long-term debt, principal amount		$ 700	700
4.375% Senior Notes Due 2047 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		4.375%
Long-term debt, principal amount		$ 500	500
3.125% Senior Notes Due 2051 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		3.125%
Long-term debt, principal amount		$ 600	600
Loan related to tax-exempt waste disposal revenue bonds due 2027 \| Senior Notes
Credit Agreement [Line Items]
Stated interest rate (percent)		2.48%
Long-term debt, principal amount		$ 11	11
Term Loan Due 2026 \| Senior Notes
Credit Agreement [Line Items]
Long-term debt, principal amount		$ 1	$ 7

Supplemental Information (Restructuring Accrual Activity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Pernis Facility Closure
Restructuring Reserve [Roll Forward]
Balances at beginning of period	$ 71
Charges	247	$ 75
Payments for Restructuring	(89)
Inventory Write-down	(15)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	12	(4)
Balances at end of period	226	71
Restructuring and Related Cost, Cost Incurred to Date	322
Pernis Facility Closure \| Inventory Write-Down
Restructuring Reserve [Roll Forward]
Balances at beginning of period	0
Charges	15	0
Payments for Restructuring	0
Inventory Write-down	(15)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	0
Balances at end of period	0	0
Restructuring and Related Cost, Cost Incurred to Date	15
Pernis Facility Closure \| Asset Retirement Obligations
Restructuring Reserve [Roll Forward]
Balances at beginning of period	23
Charges	98	24
Payments for Restructuring	(26)
Inventory Write-down	0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	4	(1)
Balances at end of period	99	23
Restructuring and Related Cost, Cost Incurred to Date	122
Pernis Facility Closure \| Employee Severance
Restructuring Reserve [Roll Forward]
Balances at beginning of period	4
Charges	23	4
Payments for Restructuring	(3)
Inventory Write-down	0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	1	0
Balances at end of period	25	4
Restructuring and Related Cost, Cost Incurred to Date	27
Pernis Facility Closure \| Contract Termination Costs
Restructuring Reserve [Roll Forward]
Balances at beginning of period	44
Charges	111	47
Payments for Restructuring	(60)
Inventory Write-down	0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	7	(3)
Balances at end of period	102	$ 44
Restructuring and Related Cost, Cost Incurred to Date	158
Chlorovinyls and Styrene Facility Closure
Restructuring Reserve [Roll Forward]
Charges	393
Inventory Write-down	(7)
Balances at end of period	76
Chlorovinyls and Styrene Facility Closure \| Property, Plant and Equipment
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	(282)
Chlorovinyls and Styrene Facility Closure \| Other Assets
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	(28)
Chlorovinyls and Styrene Facility Closure \| Inventory Write-Down
Restructuring Reserve [Roll Forward]
Charges	30
Inventory Write-down	(7)
Balances at end of period	0
Chlorovinyls and Styrene Facility Closure \| Inventory Write-Down \| Property, Plant and Equipment
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	(23)
Chlorovinyls and Styrene Facility Closure \| Inventory Write-Down \| Other Assets
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	0
Chlorovinyls and Styrene Facility Closure \| Accelerated Depreciation and Amortization
Restructuring Reserve [Roll Forward]
Charges	287
Inventory Write-down	0
Balances at end of period	0
Chlorovinyls and Styrene Facility Closure \| Accelerated Depreciation and Amortization \| Property, Plant and Equipment
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	(259)
Chlorovinyls and Styrene Facility Closure \| Accelerated Depreciation and Amortization \| Other Assets
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	(28)
Chlorovinyls and Styrene Facility Closure \| Asset Retirement Obligations
Restructuring Reserve [Roll Forward]
Charges	52
Inventory Write-down	0
Balances at end of period	52
Chlorovinyls and Styrene Facility Closure \| Asset Retirement Obligations \| Property, Plant and Equipment
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	0
Chlorovinyls and Styrene Facility Closure \| Asset Retirement Obligations \| Other Assets
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	0
Chlorovinyls and Styrene Facility Closure \| Employee Severance
Restructuring Reserve [Roll Forward]
Charges	17
Inventory Write-down	0
Balances at end of period	17
Chlorovinyls and Styrene Facility Closure \| Employee Severance \| Property, Plant and Equipment
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	0
Chlorovinyls and Styrene Facility Closure \| Employee Severance \| Other Assets
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	0
Chlorovinyls and Styrene Facility Closure \| Facility Closing
Restructuring Reserve [Roll Forward]
Charges	7
Inventory Write-down	0
Balances at end of period	7
Chlorovinyls and Styrene Facility Closure \| Facility Closing \| Property, Plant and Equipment
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	0
Chlorovinyls and Styrene Facility Closure \| Facility Closing \| Other Assets
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	$ 0

Long-Term Debt

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt consisted of the following at December 31:


	2025		2024



3.60% senior notes due August 2026 (the "3.60% 2026 Senior Notes") (1)	$	496		$	750
Loan related to tax-exempt waste disposal revenue bonds due December 2027 (2)	11			11
1.625% €700 million senior notes due July 2029 (the "1.625% 2029 Senior Notes") (1)	822			727
3.375% senior notes due June 2030 (the "3.375% 2030 Senior Notes") (1)	300			300
3.50% senior notes due November 2032 (the "3.50% 2032 tax-exempt GO Zone Refunding Senior Notes") (1)	250			250
5.550% senior notes due November 2035 (the "5.550% 2035 Senior Notes") (1)	600			—
2.875% senior notes due August 2041 (the "2.875% 2041 Senior Notes") (1)	350			350
5.00% senior notes due August 2046 (the "5.00% 2046 Senior Notes") (1)	700			700
4.375% senior notes due November 2047 (the "4.375% 2047 Senior Notes") (1)	500			500
3.125% senior notes due August 2051 (the "3.125% 2051 Senior Notes") (1)	600			600
6.375% senior notes due November 2055 (the "6.375% 2055 Senior Notes") (1)	600			—
3.375% senior notes due August 2061 (the "3.375% 2061 Senior Notes") (1)	450			450
Term loans due March 2026	1			7
Long-term debt, principal amount	5,680			4,645
Less:
Unamortized discount and debt issuance costs	96			83
Long-term debt, carrying value	5,584			4,562
Less:
3.60% 2026 Senior Notes	496			—
Current portion of long-term debt	1			6
Long-term debt, carrying value, net of current portion	$	5,087		$	4,556

______________________________

(2) Interest on the waste disposal revenue bonds accrues at a rate determined by a remarketing agent. The interest rate on the waste disposal revenue bonds at December 31, 2025 was 2.48%.

Credit Agreement

On June 9, 2022, the Company entered into a $1,500 revolving credit facility that is scheduled to mature on June 9, 2027 (the "Credit Agreement") and, in connection therewith, terminated the Company's then existing revolving credit agreement. The Credit Agreement bears interest at either (a) Adjusted Term SOFR (as defined in the Credit Agreement) plus a margin ranging from 1.00% to 1.625% per annum or (b) Alternate Base Rate (as defined in the Credit Agreement) plus a margin ranging from 0.00% to 0.625% per annum, in each case depending on the credit rating of the Company. The Credit Agreement contains certain affirmative and negative covenants, including a quarterly total leverage ratio financial maintenance covenant. As of December 31, 2025, the Company was in compliance with the total leverage ratio financial maintenance covenant. The Credit Agreement also contains certain events of default and, if and for so long as certain events of default have occurred and are continuing, any overdue amounts outstanding under the Credit Agreement will accrue interest at an increased rate, the lenders can terminate their commitments to lend thereunder and payments of any outstanding amounts thereunder could be accelerated by the lenders. None of the Company's subsidiaries are required to guarantee the obligations of the Company under the Credit Agreement.

The Credit Agreement includes a $150 sub-limit for letters of credit, and any outstanding letters of credit will be deducted from availability under the facility. The Credit Agreement also provides for a discretionary $50 commitment for swingline loans to be provided on a same-day basis. The Company may also increase the size of the facility, in increments of at least $25, up to a maximum of $500, subject to certain conditions and if certain lenders agree to commit to such an increase.

As of December 31, 2025, the Company had no borrowings and no letters of credit outstanding, and had borrowing availability of $1,500, under the Credit Agreement.

As of December 31, 2025, the Company had $45 standby letters of credit, made in the ordinary course of business.

5.550% Senior Notes due 2035

On November 6, 2025, the Company completed the registered public offering of $600 aggregate principal amount of the 5.550% 2035 Senior Notes. The 5.550% 2035 Senior Notes accrue interest from November 6, 2025 and will be payable semi-annually in arrears on May 15 and November 15 of each year, beginning May 15, 2026.

6.375% Senior Notes due 2055

On November 6, 2025, the Company completed the registered public offering of $600 aggregate principal amount of the 6.375% 2055 Senior Notes. The 6.375% 2055 Senior Notes accrue interest from November 6, 2025 and will be payable semi-annually in arrears on May 15 and November 15 of each year, beginning May 15, 2026.

3.60% Senior Notes due 2026

In August 2016, the Company issued $750 aggregate principal amount of the 3.60% 2026 Senior Notes. On November 12, 2025, the Company repurchased $254 aggregate principal amount of the outstanding 3.60% 2026 Senior Notes pursuant to a tender offer at a price equal to 99.63% of the principal amount of the notes plus accrued and unpaid interest thereon. The remaining outstanding balance of the 3.60% 2026 Senior Notes is reflected as current portion of the long-term debt on the consolidated balance sheet at December 31, 2025.

As of December 31, 2025, the Company was in compliance with all of its long-term debt covenants.

The weighted average interest rate on all long-term debt was 3.9% at December 31, 2025 and 3.4% at December 31, 2024. Unamortized debt issuance costs on long-term debt were $42 and $32 at December 31, 2025 and 2024, respectively.

Aggregate scheduled maturities of long-term debt during the next five years consist of $497 in 2026, $11 in 2027, $822 in 2029 and $300 in 2030. There are no other scheduled maturities of debt in 2026 through 2030.

Fair Value Measurements

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Fair Value Measurements

The Company has financial assets and liabilities subject to fair value measures. These financial assets and liabilities include cash and cash equivalents, accounts receivable, net, accounts payable and long-term debt, all of which are recorded at carrying value. The amounts reported in the Company's consolidated balance sheets for cash and cash equivalents, accounts receivable, net and accounts payable approximate their fair value due to the short maturities of these instruments. The carrying and fair values of the Company's long-term debt at December 31, 2025 and 2024 are summarized in the table below. The Company's long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company's long-term debt. Because the Company's long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company's long-term debt are classified as Level 2 inputs within the fair value hierarchy.


	2025				2024
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term Debt	$	5,584	$	4,873	$	4,562	$	3,836

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
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+ Details

Earnings and Dividends per Share

12 Months Ended

Dec. 31, 2025

Earnings and Dividends Per Share [Abstract]

Earnings and Dividends per Share

The Company has unvested restricted stock units outstanding that are considered participating securities and, therefore, computes basic and diluted earnings per share under the two-class method. Basic earnings per share for the periods are based upon the weighted average number of shares of common stock outstanding during the periods. Diluted earnings per share include the effects of certain stock options and performance stock units.


	Year Ended December 31,
	2025		2024		2023
Net income (loss) attributable to Westlake Corporation	$	(1,508)	$	602	$	479
Less:
Net income (loss) attributable to participating securities	(7)		3		3
Net income (loss) attributable to common stockholders	$	(1,501)	$	599	$	476

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:


	Year Ended December 31,
	2025		2024		2023
Weighted average common shares—basic	128,260,331		128,535,226		127,806,317
Plus incremental shares from:
Assumed exercise of options and vesting of performance stock units	—		671,696		792,124
Weighted average common shares—diluted	128,260,331		129,206,922		128,598,441

Earnings per common share attributable to Westlake Corporation
Basic	$	(11.70)	$	4.66	$	3.73
Diluted	$	(11.70)	$	4.64	$	3.70

Excluded from the computation of diluted earnings per share for the years ended December 31, 2025, 2024 and 2023 are options to purchase 920,880, 275,024 and 263,131 shares of common stock, respectively. Performance stock units assumed vesting of 167,030 for the year ended December 31, 2025 is also excluded. These options and performance stock units were excluded because the effect of including them would have been antidilutive.

Dividends per Share

Dividends per common share for the years ended December 31, 2025, 2024 and 2023 were as follows:


	Year Ended December 31,
	2025		2024		2023
Dividends per common share	$	2.1100	$	2.0500	$	1.7140

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Schedule Of Carrying And Fair Values Of Long-Term Debt

The carrying and fair values of the Company's long-term debt at December 31, 2025 and 2024 are summarized in the table below. The Company's long-term debt instruments are publicly-traded. A market approach, based upon quotes from financial reporting services, is used to measure the fair value of the Company's long-term debt. Because the Company's long-term debt instruments may not be actively traded, the inputs used to measure the fair value of the Company's long-term debt are classified as Level 2 inputs within the fair value hierarchy.


	2025				2024
	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term Debt	$	5,584	$	4,873	$	4,562	$	3,836

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024
Goodwill [Line Items]
Impairment of goodwill		$ 727
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]		Impairment of goodwill and long-lived assets
Performance and Essential Materials Segment
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	$ 128	$ 855	$ 128
Impairment of goodwill	$ 128	$ 727
Goodwill Impairment Discount Rate Minimum	1000.00%
Goodwill Impairment Discount Rate Maximum	1200.00%

- Definition

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Leases (Details) - USD ($) $ in Millions	12 Months Ended
Leases (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 798	$ 801
Accrued and other liabilities	138	128
Operating lease liabilities	688	713
Total operating lease liabilities	$ 826	$ 841
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued and other liabilities	Accrued and other liabilities
Weighted Average Remaining Term (in years)	8 years	9 years
Weighted Average Lease Discount Rate	4.40%	4.20%
Lease, Cost [Abstract]
Operating lease cost	$ 178	$ 162	$ 142
Short-term lease cost	128	131	121
Total operating lease cost	306	293	$ 263
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
2026	166
2027	155
2028	138
2029	116
2030	92
Thereafter	346
Total lease payments	1,013
Less: imputed interest	(187)
Affiliates
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	47	47
Affiliates \| Fixed Lease Payments
Lease, Cost [Abstract]
Operating lease cost	$ 6	$ 6

Equity Method Investments (Changes in Investment) (Details) - LACC, LLC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Balance at beginning of period	$ 1,018	$ 1,047
Cash contributions	30	22
Depreciation and amortization	(57)	(51)
Balance at end of period	$ 991	$ 1,018

- Definition

Fair value of investment in security owned.

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+ Details

Segment and Geographic Information (Total Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Total assets	$ 19,961	$ 20,750
Equity method investments	1,062	1,081
Operating Segments \| Performance and Essential Materials Segment
Segment Reporting Information [Line Items]
Total assets	12,091	13,151
Operating Segments \| Housing and Infrastructure Products Segment
Segment Reporting Information [Line Items]
Total assets	4,913	4,855
Corporate and other
Segment Reporting Information [Line Items]
Total assets	2,957	2,744
Intersegment Eliminations
Segment Reporting Information [Line Items]
Total assets	$ 17,004	$ 18,006

- Definition

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References + Details

Supplemental Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Supplemental Information (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Contract with Customer, Liability, Payment Advance	$ 70
Contract with Customer, Liability	147	$ 147	$ 62	$ 52	$ 42
Contract with Customer, Liability, Revenue Recognized		(5)	(5)	(5)
Contract with Customer, Liability, Increases due to Cash Received and Due, Excluding Amounts Recognized as Revenue		90	15	15
Accrued Liabilities
Accrued and other liabilities	1,490	1,490	1,362
Accrued rebates	225	225	232
Accrued and other liabilities	$ 138	138	128
Non-Cash Investing Activity [Abstract]
Capital Expenditures Incurred but Not yet Paid		128	157	184
Restructuring and Related Activities [Abstract]
Restructuring, transaction and integration-related costs		640	91	28
Other Income and Expenses [Abstract]
Interest income		100	153	104
Pension Gain, Other		32	19	28
Income from unconsolidated subsidiaries		16	18	19
Supplemental Cash Flow Information [Abstract]
Operating Lease, Payments		177	154	139
Right-of-use assets obtained in exchange for operating lease obligations		141	246	240
Interest paid, net of interest capitalized		157	153	159
Income taxes paid		$ 104	422	$ 421
Pension Plan \| United States
Other Income and Expenses [Abstract]
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income, net
Pension Plan \| Foreign Plan
Other Income and Expenses [Abstract]
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income, net
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Related Party Transaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	20 years	20 years
Revenue, Remaining Performance Obligation, Amount	$ 187	$ 187
Pernis Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring, transaction and integration-related costs		232	75
Restructuring Charges		247	75
Inventory Write-down		15
Chlorovinyls and Styrene Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring, transaction and integration-related costs		386
Restructuring Charges		$ 393
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration]		Restructuring, transaction and integration-related costs
Inventory Write-down		$ 7
Huasu PVC unit
Restructuring and Related Activities [Abstract]
Restructuring, transaction and integration-related costs		9
Employee Severance \| Pernis Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		23	4
Restructuring and Related Cost, Expected Cost Remaining	7	7
Inventory Write-down		0
Employee Severance \| Chlorovinyls and Styrene Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		17
Restructuring and Related Cost, Expected Cost Remaining	4	4
Inventory Write-down		0
Asset Retirement Obligations \| Pernis Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		98	24
Inventory Write-down		0
Asset Retirement Obligations \| Chlorovinyls and Styrene Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		52
Inventory Write-down		0
Inventory Write-Down \| Pernis Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		15	0
Inventory Write-down		15
Inventory Write-Down \| Chlorovinyls and Styrene Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		30
Inventory Write-down		7
Contract Termination Costs \| Pernis Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		111	47
Inventory Write-down		0
Facility Closing \| Pernis Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring and Related Cost, Expected Cost Remaining	3	3
Facility Closing \| Chlorovinyls and Styrene Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		7
Restructuring and Related Cost, Expected Cost Remaining	21	21
Inventory Write-down		0
Accelerated Depreciation and Amortization \| Chlorovinyls and Styrene Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		287
Inventory Write-down		0
Restructuring Charges \| Chlorovinyls and Styrene Facility Closure
Restructuring and Related Activities [Abstract]
Restructuring Charges		317
Related Party
Accrued Liabilities
Other Liabilities, Current	$ 31	$ 31	$ 26

Financial Instruments (Cash Equivalents and Restricted Cash) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity securities	$ 0	$ 1,009
Restricted cash and cash equivalents	16	16
Marketable Securities [Line Items]
Available-for-sale securities	204	$ 0
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	63
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	129
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	2
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	10
Debt Securities, Available-for-Sale, Amortized Cost	203
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	63
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	128
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	2
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	10
Corporate Debt Securities
Marketable Securities [Line Items]
Available-for-sale securities	109
Debt Securities, Available-for-Sale, Amortized Cost	108
US Treasury Securities
Marketable Securities [Line Items]
Available-for-sale securities	37
Debt Securities, Available-for-Sale, Amortized Cost	37
US Government Agencies Debt Securities
Marketable Securities [Line Items]
Available-for-sale securities	13
Debt Securities, Available-for-Sale, Amortized Cost	13
Asset-Backed Securities
Marketable Securities [Line Items]
Available-for-sale securities	37
Debt Securities, Available-for-Sale, Amortized Cost	37
Supranational Securities
Marketable Securities [Line Items]
Available-for-sale securities	8
Debt Securities, Available-for-Sale, Amortized Cost	$ 8

Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2025

Receivables [Abstract]

Schedule Of Accounts Receivable

Accounts receivable consisted of the following at December 31:


	2025		2024
Trade customers	$	1,254	$	1,339
Related parties	2		3
Allowance for credit losses	(27)		(27)
	1,229		1,315
Federal and state taxes	158		68
Other	117		100
Accounts receivable, net	$	1,504	$	1,483

Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Balance at beginning of year		$ 2,031	$ 2,041
Impairment of goodwill		(727)
Effects of changes in foreign exchange rates		10	(10)
Balance at end of year	$ 2,041	1,314	2,031
Performance and Essential Materials Segment
Goodwill [Roll Forward]
Balance at beginning of year		893	897
Impairment of goodwill	(128)	(727)
Effects of changes in foreign exchange rates		3	(4)
Balance at end of year	897	169	893
Housing and Infrastructure Products Segment
Goodwill [Roll Forward]
Balance at beginning of year		1,138	1,144
Impairment of goodwill		0
Effects of changes in foreign exchange rates		7	(6)
Balance at end of year	$ 1,144	$ 1,145	$ 1,138

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

- Definition

+ References + Details

Employee Benefits (Schedule Of Accumulated Benefit Obligations In Excess Of Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funding Status [Extensible Enumeration]	Underfunded Plan	Underfunded Plan
United States
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ (307)	$ (464)
Accumulated benefit obligation	(307)	(464)
Fair value of plan assets	285	417
United States \| Underfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(285)	417
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	(248)	(241)
Accumulated benefit obligation	(246)	(239)
Fair value of plan assets	387	378
Foreign Plan \| Underfunded Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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+ Details

- Definition

Indicates status of funding for defined benefit plan designed to provide retirement benefits.

+ References

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+ Details

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2025
Auditor [Abstract]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Houston, Texas
Auditor Firm ID	238

Westlake Chemical Partners LP	12 Months Ended
Westlake Chemical Partners LP	Dec. 31, 2025
Partners' Capital [Abstract]
Westlake Chemical Partners LP	Westlake Chemical Partners LP In 2014, the Company formed Westlake Partners to operate, acquire and develop ethylene production facilities and related assets. Also in 2014, Westlake Partners completed its initial public offering of 12,937,500 common units. Most recently, on March 29, 2019, Westlake Partners purchased an additional 4.5% newly issued limited partner interests in OpCo and completed a private placement of 2,940,818 common units. TTWF LP, the Company's principal stockholder and a related party, acquired 1,401,869 units out of the 2,940,818 common units issued in the private placement. At December 31, 2025, Westlake Partners had a 22.8% limited partner interest in OpCo, and the Company retained a 77.2% limited partner interest in OpCo and a significant interest in Westlake Partners through the Company's ownership of Westlake Partners' general partner, 40.1% of the limited partner interests (consisting of 14,122,230 common units) and incentive distribution rights. On October 4, 2018, Westlake Partners and Westlake Partners GP, the general partner of Westlake Partners, entered into an Equity Distribution Agreement with UBS Securities LLC, Barclays Capital Inc., Citigroup Global Markets Inc., Deutsche Bank Securities Inc., RBC Capital Markets, LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC to offer and sell Westlake Partners' common units, from time to time, up to an aggregate offering amount of $50. This Equity Distribution Agreement was amended on February 28, 2020 to reference a new shelf registration for utilization under this agreement. No common units had been issued under this program as of December 31, 2025.

Description of Business and Significant Accounting Policies

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Significant Accounting Policies

Description of Business

Westlake Chemical Partners LP

Principles of Consolidation

Basis of Presentation

The accompanying consolidated financial statements have been prepared in conformity with the accounting principles generally accepted in the United States.

Cash and Cash Equivalents

Cash equivalents consist of highly liquid investments that are readily convertible into cash and have a maturity of three months or less at the date of acquisition.

Concentration of Credit Risk

Allowance for Credit Losses

Available-for-Sale Securities

Inventories

Property, Plant and Equipment

Depreciation is provided by utilizing the straight-line method over the estimated useful lives of the assets as follows:


Classification									Years
Buildings and improvements									40
Plant and equipment									10-25
Other									3-15

Impairment of Long-Lived Assets

Impairment of Goodwill

Equity Method Investments

Other Assets, net

Other assets, net include turnaround costs, investments in unconsolidated subsidiaries, restricted cash, deferred charges and other long-term assets.

Business Combinations

Income Taxes

Foreign Currency Translation

Revenue Recognition

Leases

Transportation and Freight

Price Risk Management

Asset Retirement Obligations

Environmental and Legal Obligations

Use of Estimates

Warranty Costs

Recently Issued Accounting Pronouncements

Accounting for Government Grants Received by Business Entities (ASU 2025-10)

Hedge Accounting Improvements (ASU 2025-09)

Targeted Improvements to the Accounting for Internal-Use Software (ASU 2025-06)

Measurement of Credit Losses for Accounts Receivable and Contract Assets (ASU 2025-05)

Disaggregation of Income Statement Expenses (ASU 2024-03)

Recently Adopted Accounting Standards

Income Taxes (Topic 740): Improvements to Income Tax Disclosures (ASU No.2023-09)

Business Combinations—Joint Venture Formations (Subtopic 805-60): Recognition and Initial Measurement (ASU 2023-05)

Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Disclosure [Abstract]
Weighted average interest rate	3.90%	3.40%
Unamortized debt issuance costs	$ 42	$ 32
Long-term debt, maturity, year one	497
Long-term debt, maturity, year two	11
Long-term debt, maturity, year three	822
Long-term debt, maturity, year five	$ 300

Fair Value Measurements (Schedule Of Carrying And Fair Values Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Carrying Value	$ 5,584	$ 4,562
Fair Value	$ 4,873	$ 3,836

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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- Definition

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+ Details

Segment and Geographic Information (Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting [Abstract]
Income from operations for reportable segments	$ (1,578)	$ 875	$ 729
Interest expense	(171)	(159)	(165)
Other income, net	152	222	136
Income (loss) before income taxes	$ (1,597)	$ 938	$ 700

The net result for the period of deducting operating expenses from operating revenues.

+ References

+ Details

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2025
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity The Company's Board of Directors has declared regular quarterly dividends to holders of its common stock aggregating $272, $264 and $221 for the years ended December 31, 2025, 2024 and 2023, respectively. Common Stock Each share of common stock entitles the holder to one vote on all matters on which holders are permitted to vote, including the election of directors. There are no cumulative voting rights. Accordingly, holders of a majority of the total votes entitled to vote in an election of directors will be able to elect all of the directors standing for election. Subject to preferences that may be applicable to any outstanding preferred stock, the holders of the common stock will share equally on a per share basis any dividends when, as and if declared by the Board of Directors out of funds legally available for that purpose. If the Company is liquidated, dissolved or wound up, the holders of the Company's common stock will be entitled to a ratable share of any distribution to stockholders, after satisfaction of all the Company's liabilities and of the prior rights of any outstanding class of the Company's preferred stock. The Company's common stock has no preemptive or conversion rights or other subscription rights. There are no redemption or sinking fund provisions applicable to the Company's common stock. Preferred Stock The Company's charter authorizes the issuance of shares of preferred stock. The Company's Board of Directors has the authority, without stockholder approval, to issue preferred shares from time to time in one or more series, and to fix the number of shares and terms of each such series. The Board may determine the designations and other terms of each series including dividend rates, whether dividends will be cumulative or non-cumulative, redemption rights, liquidation rights, sinking fund provisions, conversion or exchange rights and voting rights. Stock Repurchase Program In November 2014, the Company's Board of Directors approved a $250 share repurchase program (the "2014 Program"). In November 2015, the Company's Board of Directors approved the expansion of the 2014 Program by an additional $150. In August 2018, the Company's Board of Directors approved the expansion of the 2014 Program by an additional $150. In August 2022, the Company's Board of Directors approved the further expansion of the existing 2014 Program by an additional $500. During the year ended December 31, 2025, 725,652 shares of the Company's common stock were repurchased for an aggregate purchase price of $63 under the 2014 Program. The number of shares repurchased by the Company under the 2014 Program was 725,652, 480,081 and 211,294 for the years ended December 31, 2025, 2024 and 2023, respectively. As of December 31, 2025, the Company had repurchased a total of 9,928,283 shares of its common stock for an aggregate purchase price of approximately $697. Any shares repurchased under the 2014 Program are held by the Company as treasury stock and may be used for general corporate purposes, including for the 2013 Omnibus Incentive Plan. In 2014, the Company began delivering treasury shares to employees and non-employee directors for options exercised, for the settlement of restricted stock units and for the settlement of performance stock units. The cost of treasury shares delivered is determined using the specific identification method.

- Definition

The entire disclosure for equity.

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+ Details

Westlake Chemical Partners LP (Details) - USD ($) $ in Millions				12 Months Ended
	Mar. 29, 2019	Oct. 04, 2018	Aug. 04, 2014	Dec. 31, 2025
Related Party Transaction [Line Items]
Partners' Capital Account, Units, Sold in Public Offering			12,937,500
Partners' Capital Account, Units, Sold in Private Placement	2,940,818
Partners' Units, Maximum Aggregate Offering Amount, ATM		$ 50
Limited Partner \| Westlake Chemical OpCo LP
Related Party Transaction [Line Items]
Limited Partnership Ownership Percentage Increase	4.50%
Principal Owner \| TTWF LP
Related Party Transaction [Line Items]
Partners' Capital Account, Units, Acquisitions	1,401,869
Subsidiary of Common Parent \| Limited Partner \| Westlake Chemical Partners LP
Related Party Transaction [Line Items]
Partners' Capital Account, Units				14,122,230
Subsidiary of Common Parent \| IPO \| Limited Partner \| Westlake Chemical OpCo LP
Related Party Transaction [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest				22.80%
Limited partner interest (percent)				77.20%
Subsidiary of Common Parent \| IPO \| Limited Partner \| Westlake Chemical Partners LP
Related Party Transaction [Line Items]
Limited partner interest (percent)				40.10%

Income Taxes (Schedule Of The Provision For (Benefit From) Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current
Federal	$ (16)	$ 215	$ 229
State	3	24	26
Foreign	64	87	98
Total Current	51	326	353
Deferred
Federal	(150)	(58)	(82)
State	(6)	35	(31)
Foreign	(21)	(12)	(62)
Total Deferred	(177)	(35)	(175)
Provision for (benefit from) income taxes	$ (126)	$ 291	$ 178

Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Net operating loss carryforward	$ 524	$ 230
Credit carryforward	30	28
Operating lease liabilities	202	202
Accruals	106	110
Pension	20	42
Inventories	39	36
Research and experimental expenditures	112	154
Other	87	36
Deferred taxes assets—total	1,120	838
Property, plant and equipment	(1,242)	(1,259)
Intangibles	(247)	(226)
Operating lease right-of-use asset	(195)	(191)
Turnaround costs	(52)	(53)
Consolidated partnerships	(165)	(202)
Equity method investments	(224)	(236)
Other	(33)	(29)
Deferred tax liabilities—total	(2,158)	(2,196)
Valuation allowance	(298)	(170)	$ (118)	$ (47)
Total net deferred tax liabilities	(1,336)	(1,528)
Noncurrent deferred tax asset	7	25
Noncurrent deferred tax liability	$ (1,343)	$ (1,553)

Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2025

Investments, Debt and Equity Securities [Abstract]

Debt Securities, Available-for-Sale


	2025		2024


Available-for-sale securities	$	204	$	—

The cost, fair value and fair value levels of the Company's available-for-sale debt securities were as follows:


	2025
	Cost		Fair Value		Fair Value Level
Debt securities
Corporate bonds	$	108	$	109	Level 2
U.S. government treasury securities	37		37		Level 2
U.S. federal agency securities	13		13		Level 2
Asset-backed securities	37		37		Level 2
Supranational securities	8		8		Level 2
Available-for-sale debt securities	$	203	$	204

Contractual maturities of debt securities
Within one year	$	63	$	63
One to five years	128		129
Six to ten years	2		2
After ten years	10		10
Available-for-sale debt securities	$	203	$	204

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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+ Details

Earnings and Dividends per Share (Tables)

12 Months Ended

Dec. 31, 2025

Earnings and Dividends Per Share [Abstract]

Schedule Of Net Income Attributable To Common Stockholders

Diluted earnings per share include the effects of certain stock options and performance stock units.


	Year Ended December 31,
	2025		2024		2023
Net income (loss) attributable to Westlake Corporation	$	(1,508)	$	602	$	479
Less:
Net income (loss) attributable to participating securities	(7)		3		3
Net income (loss) attributable to common stockholders	$	(1,501)	$	599	$	476

Reconciliation Of Denominator For Basic And Diluted Earnings (Loss) Per Share

The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:


	Year Ended December 31,
	2025		2024		2023
Weighted average common shares—basic	128,260,331		128,535,226		127,806,317
Plus incremental shares from:
Assumed exercise of options and vesting of performance stock units	—		671,696		792,124
Weighted average common shares—diluted	128,260,331		129,206,922		128,598,441

Earnings per common share attributable to Westlake Corporation
Basic	$	(11.70)	$	4.66	$	3.73
Diluted	$	(11.70)	$	4.64	$	3.70

Dividends Per Share

Dividends per Share

Dividends per common share for the years ended December 31, 2025, 2024 and 2023 were as follows:


	Year Ended December 31,
	2025		2024		2023
Dividends per common share	$	2.1100	$	2.0500	$	1.7140

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2025
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Earnings and Dividends per Share (Narrative) (Details) - shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of options excluded from computation of diluted earnings per share	920,880	275,024	263,131
Performance Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of options excluded from computation of diluted earnings per share	167,030

Property, Plant And Equipment

12 Months Ended

Dec. 31, 2025

Property, Plant and Equipment, Net [Abstract]

Property, Plant And Equipment

Property, Plant and Equipment

Property, plant and equipment consisted of the following at December 31:


	2025		2024
Land	$	311	$	306
Buildings and improvements	1,104		1,011
Plant and equipment	12,163		11,192
Other	973		891
	14,551		13,400
Less: Accumulated depreciation (includes accelerated depreciation)	6,736		5,848
	7,815		7,552
Construction in progress	790		1,081
Property, plant and equipment, net	$	8,605	$	8,633

Depreciation expense on property, plant and equipment of $797, $759 and $763 is included primarily in cost of sales in the Company's consolidated statements of operations for the years ended December 31, 2025, 2024 and 2023, respectively. In addition, accelerated depreciation expense of $259 was recognized in 2025 related to the closures of certain Chlorovinyls facilities and Styrene facility. See Note 18 for more detailed information.

Long-Lived Assets Recoverability

In the third quarter of 2025, due to the recent operating losses and the downward revision of forecasts for the North American Chlorovinyls asset group, which comprises PVC, VCM, caustic soda, chlorine and related derivatives assets in North America, and certain other asset groups in the third quarter of 2025, the Company evaluated these asset groups' long-lived assets for recoverability. A recoverability test was performed for these asset groups to compare the carrying amounts of the asset groups to the future net undiscounted cash flows expected to be generated by the respective asset groups. The undiscounted cash flow projections were based on historical results, estimates made by management of future market conditions supplemented by information prepared by third party consultants, including input costs and sales prices, current and future strategic and operational plans and future financial performance projected through the remaining useful life of the primary asset in the asset group. Based on the recoverability tests in the third quarter of 2025, the Company determined that the carrying amounts of the assets of the North American Chlorovinyls and certain other asset groups were recoverable.

In 2023, recoverability tests were performed for each of Westlake Epoxy's asset groups to compare the carrying amounts of the asset groups to the future net undiscounted cash flow expected to be generated by the asset group. Based on the recoverability tests performed, the Company determined that the carrying amount of the primary assets of the Westlake Epoxy Netherlands asset group was not recoverable. The fair value of the asset group was calculated using a discounted cash flow methodology and a non-cash impairment charge of $347, related to the Company's base epoxy resin business in the Netherlands, was recognized in 2023 within the Performance and Essential Materials segment to reduce the carrying amount of the asset group to its fair value. The long-lived asset impairment charge was reported in impairment of goodwill and long-lived assets in the 2023 consolidated statements of operations.

Accounts Receivable (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses	$ (27)	$ (27)
Accounts Receivable from trade customers, net	1,229	1,315
Federal and state taxes	158	68
Other	117	100
Accounts receivable, net	1,504	1,483
Nonrelated Party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade customers	1,254	1,339
Related Party
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade customers	$ 2	$ 3

Accounts Payable (Tables)

12 Months Ended

Dec. 31, 2025

Payables and Accruals [Abstract]

Schedule of Accounts Payable

Accounts payable consisted of the following at December 31:


	2025		2024
Accounts payable—third parties	$	737	$	806
Accounts payable to related parties	18		16
Notes and other short-term payable	28		29
Accounts payable	$	783	$	851

Long-Term Debt (Schedule Of Long-Term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Aug. 10, 2016
Debt Instrument [Line Items]
Long-term debt, principal amount	$ 5,680	$ 4,645
Unamortized discount and debt issuance costs	96	83
Long-term debt, carrying value	5,584	4,562
Current portion	497	6
Long-term debt, net	$ 5,087	4,556
Senior Notes \| 3.60% Senior Notes Due 2026
Debt Instrument [Line Items]
Stated interest rate (percent)	3.60%
Long-term debt, principal amount	$ 496	750	$ 750
Current portion	$ 496	0
Senior Notes \| Loan related to tax-exempt waste disposal revenue bonds due 2027
Debt Instrument [Line Items]
Stated interest rate (percent)	2.48%
Long-term debt, principal amount	$ 11	11
Senior Notes \| 1.625% Senior Notes Due 2029
Debt Instrument [Line Items]
Stated interest rate (percent)	1.625%
Long-term debt, principal amount	$ 822	727
Senior Notes \| 3.375% Senior Notes Due 2030
Debt Instrument [Line Items]
Stated interest rate (percent)	3.375%
Long-term debt, principal amount	$ 300	300
Senior Notes \| 3.50% Senior Notes Due 2032
Debt Instrument [Line Items]
Stated interest rate (percent)	3.50%
Long-term debt, principal amount	$ 250	250
Senior Notes \| 2.875% Senior Notes Due 2041
Debt Instrument [Line Items]
Stated interest rate (percent)	2.875%
Long-term debt, principal amount	$ 350	350
Senior Notes \| 5.00% Senior Notes Due 2026
Debt Instrument [Line Items]
Stated interest rate (percent)	5.00%
Long-term debt, principal amount	$ 700	700
Senior Notes \| 4.375% Senior Notes Due 2047
Debt Instrument [Line Items]
Stated interest rate (percent)	4.375%
Long-term debt, principal amount	$ 500	500
Senior Notes \| 3.125% Senior Notes Due 2051
Debt Instrument [Line Items]
Stated interest rate (percent)	3.125%
Long-term debt, principal amount	$ 600	600
Senior Notes \| 3.375% Senior Notes Due 2061
Debt Instrument [Line Items]
Stated interest rate (percent)	3.375%
Long-term debt, principal amount	$ 450	450
Senior Notes \| Term Loan Due 2026
Debt Instrument [Line Items]
Long-term debt, principal amount	1	7
Current portion	$ 1	6
Senior Notes \| 5.550% Senior Notes Due 2035
Debt Instrument [Line Items]
Stated interest rate (percent)	5.55%
Long-term debt, principal amount	$ 600	0
Senior Notes \| 6.375% Senior Notes Due 2055
Debt Instrument [Line Items]
Stated interest rate (percent)	6.375%
Long-term debt, principal amount	$ 600	$ 0

Related Party and Affiliate Transactions (Details) $ in Millions, lb in Billions		12 Months Ended
	Jun. 17, 2015 lb	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Feb. 01, 2022
Related Party Transaction [Line Items]
Investments in joint ventures		$ 225
Accounts payable		783	$ 851
Dividends received from equity method investments		16	20	$ 18
Net sales		11,170	12,142	12,548
Accounts receivable, net		1,504	1,483
Affiliates
Related Party Transaction [Line Items]
Plant capacity (in lbs) \| lb	2.2
Incurred and paid lease payments		4	4	3
Affiliates \| YNCORIS GmbH & Co. KG
Related Party Transaction [Line Items]
Investments in joint ventures		56	52
Affiliates \| YNCORIS GmbH & Co. KG \| Electricity And Technical Services
Related Party Transaction [Line Items]
Purchases from related parties		160	146	176
Accounts payable		$ 26	23
Affiliates \| YNCORIS GmbH & Co. KG \| YNCORIS GmbH & Co. KG
Related Party Transaction [Line Items]
Ownership interest (in percent)		20.00%
Affiliates \| Westlake UV Coatings (Shanghai) Co., Ltd.
Related Party Transaction [Line Items]
Investments in joint ventures		$ 4	4
Affiliates \| Westlake UV Coatings (Shanghai) Co., Ltd. \| Westlake UV Coatings (Shanghai) Co., Ltd.
Related Party Transaction [Line Items]
Ownership interest (in percent)					49.99%
Corporate Joint Venture \| Cypress Interstate Pipeline L.L.C \| Pipeline Fees For Transport Of Natural Gas Liquid Feedstocks
Related Party Transaction [Line Items]
Purchases from related parties		20	20	$ 20
Accounts payable		2	1
Corporate Joint Venture \| Cypress Interstate Pipeline L.L.C
Related Party Transaction [Line Items]
Investments in joint ventures		$ 10	$ 8
Corporate Joint Venture \| Cypress Interstate Pipeline L.L.C \| Cypress Interstate Pipeline L.L.C
Related Party Transaction [Line Items]
Ownership interest (in percent)		50.00%

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	300,000,000	300,000,000
Common Stock, Shares	134,651,380	134,651,380
Treasury Stock, Shares	6,740,232	6,424,366

Stock-Based Compensation (Schedule Of Option Activity And Changes) (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) $ / shares shares
Options
Options, Outstanding, beginning balance \| shares	1,088,507
Options, Granted \| shares	260,834
Options, Exercised \| shares	(85,492)
Options, Cancelled \| shares	(48,592)
Options, Outstanding, ending balance \| shares	1,215,257
Options, Exercisable, ending balance \| shares	829,130
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding, beginning balance (in dollars per share) \| $ / shares	$ 96.31
Weighted Average Exercise Price, Granted (in dollars per share) \| $ / shares	110.15
Weighted Average Exercise Price, Exercised (in dollars per share) \| $ / shares	45.06
Weighted Average Exercise Price, Cancelled (in dollars per share) \| $ / shares	120.57
Weighted Average Exercise Price, Outstanding, ending balance (in dollars per share) \| $ / shares	101.91
Weighted Average Exercise Price, Exercisable, ending balance (in dollars per share) \| $ / shares	$ 93.10
Weighted Average Remaining Term (Years) [Abstract]
Weighted Average Remaining Term (Years), Outstanding	6 years
Weighted Average Remaining Term (Years), Exercisable	4 years 8 months 12 days
Aggregate Intrinsic Value [Abstract]
Aggregate Intrinsic Value, Outstanding \| $	$ 2
Aggregate Intrinsic Value, Exercisable \| $	$ 2

Employee Benefits (Schedule Of Amounts Recognized In The Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (286)	$ (304)
Pension Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	0	0
Current liabilities	(2)	(2)
Noncurrent liabilities	(20)	(45)
Net amount recognized	(22)	(47)
Pension Plan \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Noncurrent assets	73	65
Current liabilities	(13)	(11)
Noncurrent liabilities	(234)	(230)
Net amount recognized	$ (174)	$ (176)

- Definition

Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Inventories (Schedule Of Inventory) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Inventory, Net [Abstract]
Finished products	$ 1,030	$ 1,047
Feedstock, additives, chemicals and other raw materials	366	395
Materials and supplies	257	255
Inventories	$ 1,653	$ 1,697

Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	$ 11,043	$ 10,764	$ 10,465
Ending balances	9,295	11,043	10,764
Pension and Other Post-Retirement Benefits Liability, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	54	4	52
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(34)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	24
Net other comprehensive income (loss) attributable to Westlake Corporation	(10)	50	(48)
Ending balances	44	54	4
Reclassification from AOCI, Current Period, Tax	8
Cumulative Foreign Currency Exchange, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(198)	(102)	(141)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	73
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Net other comprehensive income (loss) attributable to Westlake Corporation	73	(96)	39
Ending balances	(125)	(198)	(102)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	(144)	(98)	(89)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	40
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	24
Net other comprehensive income (loss) attributable to Westlake Corporation	64	(46)	(9)
Ending balances	(80)	(144)	(98)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balances	0	0	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Net other comprehensive income (loss) attributable to Westlake Corporation	1	0	0
Ending balances	$ 1	$ 0	$ 0

Equity Method Investments (Tables)

12 Months Ended

Dec. 31, 2025

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

Changes in the Company's investment in LACC for the years ended December 31, 2025 and 2024 were as follows:


	Investment in LACC
Balance at December 31, 2023	$	1,047
Cash contributions	22

Depreciation and amortization	(51)

Balance at December 31, 2024	1,018
Cash contributions	30

Depreciation and amortization	(57)

Balance at December 31, 2025	$	991

Earnings and Dividends per Share (Schedule Of Net Income Attributable To Common Stockholders) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings and Dividends Per Share [Abstract]
Net income (loss) attributable to Westlake Corporation	$ (1,508)	$ 602	$ 479
Net income attributable to participating securities	(7)	3	3
Net income attributable to common shareholders	$ (1,501)	$ 599	$ 476

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 40: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 41: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 42: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 43: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 60B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482689/260-10-45-60B

Reference 44: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483499/205-20-50-7

Reference 45: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 46: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1A

Reference 47: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-1B

Reference 48: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 65
-Paragraph 4
-Subparagraph (f)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481538/470-20-65-4

Reference 49: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2025

Property, Plant and Equipment, Net [Abstract]

Schedule Of Property, Plant And Equipment

Property, plant and equipment consisted of the following at December 31:


	2025		2024
Land	$	311	$	306
Buildings and improvements	1,104		1,011
Plant and equipment	12,163		11,192
Other	973		891
	14,551		13,400
Less: Accumulated depreciation (includes accelerated depreciation)	6,736		5,848
	7,815		7,552
Construction in progress	790		1,081
Property, plant and equipment, net	$	8,605	$	8,633

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Components of Income (Loss) Before Income Taxes

The components of income before income taxes are as follows:


	Year Ended December 31,
	2025		2024		2023
Domestic	$	(1,455)	$	855	$	923
Foreign	(142)		83		(223)
	$	(1,597)	$	938	$	700

Schedule of The Provision For (Benefit From) Income Taxes

The Company's provision for (benefit from) income taxes consisted of the following:


	Year Ended December 31,
	2025		2024		2023
Current
Federal	$	(16)	$	215	$	229
State	3		24		26
Foreign	64		87		98
Total current	51		326		353
Deferred
Federal	(150)		(58)		(82)
State	(6)		35		(31)
Foreign	(21)		(12)		(62)
Total deferred	(177)		(35)		(175)
Total provision for (benefit from) income taxes	$	(126)	$	291	$	178

Reconciliation of Taxes Computed at the Statutory Rate to Income Tax Expense

The Company adopted ASU 2023-09 in the 2025 annual period and applied this standard prospectively. The adoption of this ASU resulted in additional income tax disclosures. A reconciliation of taxes computed at the statutory rate to the Company's income tax expense (benefit) is as follows:


	Year Ended December 31, 2025
	Amount		Percentage
U.S. federal statutory income tax rate	$	(335)	21.0	%
State and local income tax, net of federal income tax effect	(2)		0.1	%
Foreign tax effects
Canada
Provincial taxes	23		(1.4)	%
Other Canada	(9)		0.6	%
Netherlands

Changes in valuation allowance	79		(4.9)	%
Other Netherlands	(15)		0.9	%
Other foreign jurisdictions	(1)		0.1	%
Tax credits	(14)		0.9	%


Nontaxable and nondeductible items
Goodwill impairment	151		(9.5)	%
Other	1		(0.1)	%
Worldwide changes in unrecognized tax benefits	1		(0.1)	%
Other adjustments
Noncontrolling interest	(6)		0.4	%
Other	1		(0.1)	%
Effective Tax Rate	$	(126)	7.9	%

In the 2025 annual period, state and local income taxes in Louisiana and Mississippi comprise the majority of the state and local income taxes, net of federal income tax effect category.

The comparative periods are presented based on the prior guidance. A reconciliation of taxes computed at the statutory rate to the Company's income tax expense is as follows:


	Year Ended December 31,
	2024		2023
Provision for federal income tax, at statutory rate	$	197	$	148
State income tax provision, net of federal income tax effect	6		7
Foreign income tax rate differential	7		(15)


Noncontrolling interests	(9)		(7)

Change in valuation allowance	62		76

U.S. federal research and development credits	(16)		(54)
Uncertain Income Tax Positions	9		14
Goodwill impairment	—		26
Change in state apportionment and tax rates	45		(6)
Other, net	(10)		(11)
Total income tax expense	$	291	$	178

The Company's income taxes paid is presented in accordance with ASU 2023-09 and the standard is applied prospectively. The income taxes paid, net of refunds received, is as follows:


	Year Ended December 31, 2025
US federal	$	19
US state and local	8
Foreign
Canada	53
Taiwan	6
Korea	6
Other	12
	77
Income Taxes Paid, net of Refunds Received	$	104

Schedule of Deferred Tax Assets And Liabilities

The tax effects of the principal temporary differences between financial reporting and income tax reporting at December 31 are as follows:


	2025		2024
Net operating loss carryforward	$	524	$	230
Credit carryforward	30		28
Operating lease liabilities	202		202
Accruals	106		110
Pension	20		42

Inventories	39		36
Research and experimental expenditures	112		154
Other	87		36
Deferred taxes assets—total	1,120		838
Property, plant and equipment	(1,242)		(1,259)
Intangibles	(247)		(226)
Operating lease right-of-use asset	(195)		(191)
Turnaround costs	(52)		(53)
Consolidated partnerships	(165)		(202)
Equity method investments	(224)		(236)
Other	(33)		(29)
Deferred tax liabilities—total	(2,158)		(2,196)
Valuation allowance	(298)		(170)
Total net deferred tax liabilities	$	(1,336)	$	(1,528)

Balance sheet classifications

Noncurrent deferred tax asset	$	7	$	25
Noncurrent deferred tax liability	(1,343)		(1,553)
Total net deferred tax liabilities	$	(1,336)	$	(1,528)

Schedule of Unrecognized Tax Benefits Roll Forward

The following table presents a reconciliation of the beginning and ending amounts of gross unrecognized tax benefits:


	Year Ended December 31
	2025		2024		2023
Gross unrecognized tax benefits, beginning of year	$	42	$	35	$	24
Additions for tax positions of current year	3		7		6
Additions for tax positions of prior years	1		1		15

Reductions for tax positions of prior years	(1)		—		(10)

Lapse of statute of limitations	(3)		(1)		—

Gross unrecognized tax benefits, end of year	$	42	$	42	$	35

Summary of Valuation Allowance

The following table summarizes the changes in the valuation allowance:


	Year Ended December 31
	2025		2024		2023
Valuation allowance, beginning of year	$	170	$	118	$	47

Additional allowances	128		55		94
Reversals & other changes	—		(3)		(23)
Valuation allowance, end of year	$	298	$	170	$	118

Description of Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Estimated Useful Lives of Assets

Depreciation is provided by utilizing the straight-line method over the estimated useful lives of the assets as follows:


Classification									Years
Buildings and improvements									40
Plant and equipment									10-25
Other									3-15

Schedule of Asset Retirement Obligations

The asset retirement obligations activity for the years ended December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025		2024		2023
Beginning balance, January 1,	$	81	$	40	$	31
Liabilities incurred	152		25		3
Liabilities settled	(59)		(7)		(2)
Accretion expense	1		3		1
Revisions of previous estimates	13		21		7
Effects of exchange rate changes	6		(1)		—
Ending balance, December 31,	$	194	$	81	$	40
Recorded as accrued and other liabilities	$	119	$	39	$	3
Recorded as other liabilities	$	75	$	42	$	37

Schedule of Warranty Liabilities

The warranty liabilities activity for the years ended December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025		2024		2023
Beginning balance, January 1,	$	73	$	69	$	58

Warranty provisions	35		19		24

Warranty claims paid	(27)		(15)		(13)

Ending balance, December 31,	$	81	$	73	$	69

Employee Benefits (Schedule Of Weighted Average Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.20%	5.50%	5.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Discount rate for benefit obligations	5.50%	5.00%	4.90%
Discount rate for service cost	5.40%	5.00%	5.00%
Discount rate for interest cost	5.20%	5.00%	4.80%
Expected return on plan assets	7.00%	7.00%	6.50%
Rate of compensation increase	0.00%	0.00%	0.00%
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.20%	3.50%	3.20%
Rate of compensation increase	3.00%	3.00%	3.10%
Discount rate for benefit obligations	3.50%	3.20%	3.70%
Discount rate for service cost	3.70%	3.60%	3.80%
Discount rate for interest cost	3.50%	3.20%	3.70%
Expected return on plan assets	4.00%	4.00%	3.30%
Rate of compensation increase	3.00%	3.10%	2.90%

Related Party and Affiliate Transactions	12 Months Ended
Related Party and Affiliate Transactions	Dec. 31, 2025
Related Party Transactions [Abstract]
Related Party And Affiliate Transactions	Related Party and Affiliate Transactions The Company and Lotte have a joint venture, LACC, to operate an ethylene facility with 2.2 billion pounds per year of ethylene production capacity. See Note 8 for details of the Company's transactions with LACC. The Company leases two office spaces for management and administrative services from an affiliate of the Company's principal stockholder. For the year ended December 31, 2025, 2024 and 2023, the Company incurred lease payments of approximately $4, $4 and $3, respectively. Cypress Interstate Pipeline L.L.C., a natural gas liquids pipeline joint venture in which the Company owns a 50% equity interest, transports natural gas liquid feedstocks to the Company's Lake Charles complex through its pipeline. The Company accounts for its investments in Cypress Interstate Pipeline L.L.C. under the equity method of accounting. The investment in Cypress Interstate Pipeline L.L.C. at December 31, 2025 and 2024 was $10 and $8, respectively. For the years ended December 31, 2025, 2024 and 2023, the Company incurred pipeline lease service fees of approximately $20, $20 and $20, respectively, payable to this joint venture for usage of the pipeline. The amounts due to this joint venture were $2 and $1 at December 31, 2025 and 2024. The Company owns an approximately 20% equity interest in both YNCORIS GmbH & Co. KG (formerly known as InfraServ Knapsack GmbH & Co. KG) and InfraServ Gendorf GmbH & Co. KG (collectively "Infraserv"). The Company accounts for its investments in Infraserv under the equity method of accounting. The Company has service agreements with these entities, including contracts to provide electricity, technical and leasing services to certain of the Company's production facilities in Germany. The investment in Infraserv was $56 and $52 at December 31, 2025 and 2024, respectively. For the years ended December 31, 2025, 2024 and 2023, the Company incurred charges aggregating approximately $160, $146 and $176, respectively, for these services. The amounts accrued for these related parties were approximately $26 and $23 at December 31, 2025 and 2024, respectively. In conjunction with the Westlake Epoxy acquisition, the Company acquired 49.99% equity interest in Westlake UV Coatings (Shanghai) Co., Ltd. (formerly known as Hexion UV Coatings Co., LTD). The investment in Westlake UV Coatings (Shanghai) Co., Ltd. was $4 and $4 at December 31, 2025 and 2024, respectively. The Company accounts for its investments in Westlake UV Coatings (Shanghai) Co., Ltd. under the equity method of accounting. Dividends received from equity method investments were $16, $20 and $18 for the years ended December 31, 2025, 2024 and 2023, respectively.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(e))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/850/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-6

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

+ Details

Long-Term Debt (Long-Term Debt Outstanding Information) (Details) - Senior Notes	Dec. 31, 2025
3.60% Senior Notes Due 2026
Debt Instrument [Line Items]
Stated interest rate (percent)	3.60%
1.625% Senior Notes Due 2029
Debt Instrument [Line Items]
Stated interest rate (percent)	1.625%
3.375% Senior Notes Due 2030
Debt Instrument [Line Items]
Stated interest rate (percent)	3.375%
3.50% Senior Notes Due 2032
Debt Instrument [Line Items]
Stated interest rate (percent)	3.50%
5.550% Senior Notes Due 2035
Debt Instrument [Line Items]
Stated interest rate (percent)	5.55%
2.875% Senior Notes Due 2041
Debt Instrument [Line Items]
Stated interest rate (percent)	2.875%
5.00% Senior Notes Due 2026
Debt Instrument [Line Items]
Stated interest rate (percent)	5.00%
4.375% Senior Notes Due 2047
Debt Instrument [Line Items]
Stated interest rate (percent)	4.375%
3.125% Senior Notes Due 2051
Debt Instrument [Line Items]
Stated interest rate (percent)	3.125%
6.375% Senior Notes Due 2055
Debt Instrument [Line Items]
Stated interest rate (percent)	6.375%
3.375% Senior Notes Due 2061
Debt Instrument [Line Items]
Stated interest rate (percent)	3.375%
Loan related to tax-exempt waste disposal revenue bonds due 2027
Debt Instrument [Line Items]
Stated interest rate (percent)	2.48%

Employee Benefits (Narrative Defined Contribution Plans) (Details) - United States - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Defined Contribution Plan [Line Items]
Maximum employee contribution as a percentage of annual compensation	100.00%
Employer contributions to plans	$ 39	$ 39	$ 36
Defined Contribution Retirement Plan
Defined Contribution Plan [Line Items]
Employer Contributions to Plan	$ 61	$ 63	$ 48

Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation (includes accelerated depreciation)	$ 6,736	$ 5,848
Property, plant and equipment, net	8,605	8,633
Depreciable Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,551	13,400
Property, plant and equipment, net	7,815	7,552
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	311	306
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,104	1,011
Plant and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,163	11,192
Other
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	973	891
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 790	$ 1,081

Income Taxes

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Income Taxes

The components of income before income taxes are as follows:


	Year Ended December 31,
	2025		2024		2023
Domestic	$	(1,455)	$	855	$	923
Foreign	(142)		83		(223)
	$	(1,597)	$	938	$	700

The Company's provision for (benefit from) income taxes consisted of the following:


	Year Ended December 31,
	2025		2024		2023
Current
Federal	$	(16)	$	215	$	229
State	3		24		26
Foreign	64		87		98
Total current	51		326		353
Deferred
Federal	(150)		(58)		(82)
State	(6)		35		(31)
Foreign	(21)		(12)		(62)
Total deferred	(177)		(35)		(175)
Total provision for (benefit from) income taxes	$	(126)	$	291	$	178


	Year Ended December 31, 2025
	Amount		Percentage
U.S. federal statutory income tax rate	$	(335)	21.0	%
State and local income tax, net of federal income tax effect	(2)		0.1	%
Foreign tax effects
Canada
Provincial taxes	23		(1.4)	%
Other Canada	(9)		0.6	%
Netherlands

Changes in valuation allowance	79		(4.9)	%
Other Netherlands	(15)		0.9	%
Other foreign jurisdictions	(1)		0.1	%
Tax credits	(14)		0.9	%


Nontaxable and nondeductible items
Goodwill impairment	151		(9.5)	%
Other	1		(0.1)	%
Worldwide changes in unrecognized tax benefits	1		(0.1)	%
Other adjustments
Noncontrolling interest	(6)		0.4	%
Other	1		(0.1)	%
Effective Tax Rate	$	(126)	7.9	%

In the 2025 annual period, state and local income taxes in Louisiana and Mississippi comprise the majority of the state and local income taxes, net of federal income tax effect category.

The comparative periods are presented based on the prior guidance. A reconciliation of taxes computed at the statutory rate to the Company's income tax expense is as follows:


	Year Ended December 31,
	2024		2023
Provision for federal income tax, at statutory rate	$	197	$	148
State income tax provision, net of federal income tax effect	6		7
Foreign income tax rate differential	7		(15)


Noncontrolling interests	(9)		(7)

Change in valuation allowance	62		76

U.S. federal research and development credits	(16)		(54)
Uncertain Income Tax Positions	9		14
Goodwill impairment	—		26
Change in state apportionment and tax rates	45		(6)
Other, net	(10)		(11)
Total income tax expense	$	291	$	178

The Company's income taxes paid is presented in accordance with ASU 2023-09 and the standard is applied prospectively. The income taxes paid, net of refunds received, is as follows:


	Year Ended December 31, 2025
US federal	$	19
US state and local	8
Foreign
Canada	53
Taiwan	6
Korea	6
Other	12
	77
Income Taxes Paid, net of Refunds Received	$	104

The tax effects of the principal temporary differences between financial reporting and income tax reporting at December 31 are as follows:


	2025		2024
Net operating loss carryforward	$	524	$	230
Credit carryforward	30		28
Operating lease liabilities	202		202
Accruals	106		110
Pension	20		42

Inventories	39		36
Research and experimental expenditures	112		154
Other	87		36
Deferred taxes assets—total	1,120		838
Property, plant and equipment	(1,242)		(1,259)
Intangibles	(247)		(226)
Operating lease right-of-use asset	(195)		(191)
Turnaround costs	(52)		(53)
Consolidated partnerships	(165)		(202)
Equity method investments	(224)		(236)
Other	(33)		(29)
Deferred tax liabilities—total	(2,158)		(2,196)
Valuation allowance	(298)		(170)
Total net deferred tax liabilities	$	(1,336)	$	(1,528)

Balance sheet classifications

Noncurrent deferred tax asset	$	7	$	25
Noncurrent deferred tax liability	(1,343)		(1,553)
Total net deferred tax liabilities	$	(1,336)	$	(1,528)

At December 31, 2025, the Company had federal, foreign and state net operating loss carryforwards ("NOLs") of approximately $611, $1,228 and $1,683, respectively. The $611 of federal NOLs do not expire. Of the $1,228 of foreign NOLs, $1,186 do not expire and $42 expire in varying amounts between 2026 and 2030. Of the $1,683 of state NOLs, $970 do not expire and $713 expire in varying amounts between 2026 and 2045. The utilization of federal NOLs and certain foreign and state NOLs are subject to annual limitations. On December 31, 2025, the Company had various federal and state credit carryforwards of $2 and $28, respectively, of which $16 do not expire and $14 expire in varying amounts between 2026 and 2040. Management believes the Company will realize the benefit of a portion of the net operating loss and credit carryforwards before they expire, but to the extent that the full benefit may not be realized, a valuation allowance has been recorded. The valuation allowance increased by $128 primarily due to various states' net operating loss and credit carryforwards and net operating loss carryforwards generated from continuing operations of Westlake's base epoxy resin business in the Netherlands are not expected to be realized.

The following table summarizes the changes in the valuation allowance:


	Year Ended December 31
	2025		2024		2023
Valuation allowance, beginning of year	$	170	$	118	$	47

Additional allowances	128		55		94
Reversals & other changes	—		(3)		(23)
Valuation allowance, end of year	$	298	$	170	$	118

The following table presents a reconciliation of the beginning and ending amounts of gross unrecognized tax benefits:


	Year Ended December 31
	2025		2024		2023
Gross unrecognized tax benefits, beginning of year	$	42	$	35	$	24
Additions for tax positions of current year	3		7		6
Additions for tax positions of prior years	1		1		15

Reductions for tax positions of prior years	(1)		—		(10)

Lapse of statute of limitations	(3)		(1)		—

Gross unrecognized tax benefits, end of year	$	42	$	42	$	35

The Company's total gross unrecognized tax benefits were $42, $42 and $35 as of December 31, 2025, 2024 and 2023, respectively. If recognized, the majority of the gross unrecognized tax benefit would favorably affect the effective tax rate.

The Company recognizes interest and penalties related to unrecognized tax benefits in income tax expense. Interest and penalties related to unrecognized tax benefits accrued at the end of each respective period were $6, $4, and $3. The potential changes, ultimate resolution and timing of payment for remaining matters continue to be uncertain.

The Company files income tax returns in the U.S. federal jurisdiction, various states and foreign jurisdictions. The Company is no longer subject to examinations by tax authorities before the year 2017.

On October 8, 2021, the Organization for Economic Co-operation and Development (the "OECD")/G20 Inclusive Framework on Base Erosion and Profit Shifting released a statement indicating that its members had agreed to a Two Pillar Solution to Address the Tax Challenges Arising from the Digitalisation of the Economy. Pillar One aims to reallocate a taxpayer's residual profits to the market jurisdictions with which the taxpayer has a nexus. Pillar One targets multinational companies with global annual revenue exceeding €20 billion and profit-to-revenue ratio of more than 10%. Based on the current threshold requirements, the Company does not expect to be subject to Pillar One. Pillar Two aims to establish a minimum global tax rate of 15%, assessed through a top-up tax imposed on a country-by-country basis. The impacts of Pillar Two have been recorded since 2024, the first year in which the rules take effect and are immaterial to the Company. The Company continues to closely monitor and evaluate Pillar Two developments, including the January 5th OECD guidance introducing a Side-by-Side Safe Harbor applicable to U.S. parented groups. The guidance also introduced several other new Safe Harbors and extended the Country-by-Country Safe Harbor.

On December 4, 2024, the Governor of Louisiana signed into law a package of tax reform bills, effective January 1, 2025 and January 1, 2026. Among other things, the laws reduce the corporate state income tax rate, repeal the corporate state franchise tax and eliminate preferential apportionment treatment for companies with sales and inventory in foreign trade zones. In the fourth quarter of 2024, the Company recognized a one-time charge of approximately $45 for the revaluation of state deferred tax assets and deferred tax liabilities associated with the change in corporate state income tax and apportionment rates resulting from this change. The Company will continue to evaluate the impact of these tax law changes.

On July 4, 2025, President Trump signed into law the legislation commonly referred to as the One Big Beautiful Bill Act ("OBBBA"), which includes a broad range of tax reform provisions affecting corporations. The OBBBA, among other changes, permanently reinstates the "bonus" depreciation provisions that allow for the immediate expensing of 100% of the cost of certain qualified property, permanently reinstates the elective immediate expensing of domestic research and experimental expenditures paid or incurred and permanently relaxes the limitation on the deductibility of business interest. The OBBBA also modifies certain international tax provisions. The Company evaluated the impact of these tax law changes and recognized the associated income tax effects in the consolidated financial statements beginning in the third quarter of 2025, the period of enactment. At this time, the Company expects these tax law changes to reduce its cash tax without materially impacting its effective income tax rate.

- Definition

The entire disclosure for income tax.

+ References

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+ Details

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (1,471)	$ 647	$ 522
Pension and other post-retirement benefits
Pension and other post-retirement benefits reserves adjustment	(10)	59	(40)
Income tax benefit (provision) on pension and other post-retirement benefits	0	(9)	(8)
Foreign currency translation adjustments
Foreign currency translation	48	(86)	32
Income tax benefit (provision) on foreign currency translation	26	(13)	7
Unrealized holding gains on investments	1	0	0
Income tax provision on available-for-sale investments	0	0	0
Other comprehensive income (loss), net of income taxes	65	(49)	(9)
Comprehensive income (loss)	(1,406)	598	513
Comprehensive income attributable to noncontrolling interests, net of tax of $2, $2 and $3 for 2025, 2024 and 2023, respectively	38	42	43
Comprehensive income (loss) attributable to Westlake Corporation	$ (1,444)	$ 556	$ 470

Employee Benefits (Schedule Of Estimated Future Benefit Payments) (Details) - Pension Plan $ in Millions	Dec. 31, 2025 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Year 1	$ 58
Year 2	57
Year 3	56
Year 4	55
Year 5	56
Years 6 to 10	$ 275

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Segment and Geographic Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2025 plant Segment customer	Dec. 31, 2024 customer	Dec. 31, 2023 customer
Segment Reporting Information [Line Items]
Number of operating segments	2
Number of reportable segments	2
Number of Building Product Facilities \| plant	64
Housing and Infrastructure Products Segment
Segment Reporting Information [Line Items]
Number of major customers \| customer	0	0	0

Description of Business and Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) plant	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Capitalized interest \| $	$ 10	$ 13	$ 8
Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Deferred Cost, Amortization Period	3 years
Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Deferred Cost, Amortization Period	8 years
Westlake Chemical OpCo LP \| Limited Partner \| IPO \| Subsidiary of Common Parent
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Limited partner interest (percent)	77.20%
Westlake Chemical OpCo LP \| Subsidiaries \| Louisiana
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of production facilities	2
Westlake Chemical OpCo LP \| Subsidiaries \| Kentucky
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of production facilities	1

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2025
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event On January 5, 2026, Westlake acquired the global compounding solutions businesses of the ACI/Perplastic Group (collectively, "ACI") for a preliminary purchase price of approximately €92.4 million, subject to certain adjustments. ACI is a Portugal-based global manufacturer of specialty materials serving the wire and cable sectors with manufacturing locations in Portugal, Mexico, Tunisia and Romania. The purchase price accounting for ACI is incomplete as of the date of filing due to the limited time since the closing date.

Description of Business and Significant Accounting Policies (Warranty Liabilities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Movement in Standard Product Warranty Accrual [Roll Forward]
Standard Product Warranty Accrual, Beginning Balance	$ 73	$ 69	$ 58
Standard Product Warranty Accrual, Increase for Warranties Issued	35	19	24
Standard Product Warranty Accrual, Decrease for Payments	(27)	(15)	(13)
Standard Product Warranty Accrual, Ending Balance	$ 81	$ 73	$ 69

Cover - USD ($) $ in Billions	12 Months Ended
Cover - USD ($) $ in Billions	Dec. 31, 2025	Feb. 18, 2026	Jun. 30, 2025
Document Information [Line Items]
Document Type	10-K
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2025
Document Transition Report	false
Entity File Number	001-32260
Entity Registrant Name	Westlake Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	76-0346924
Entity Address, Address Line One	2801 Post Oak Boulevard
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77056
City Area Code	713
Local Phone Number	960-9111
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Entity Central Index Key	0001262823
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2.5
Entity Common Stock, Shares Outstanding		127,910,338
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE: Certain information required by Part II and Part III of this Form 10-K is incorporated by reference from the registrant's definitive Proxy Statement to be filed pursuant to Regulation 14A with respect to the registrant's 2026 Annual Meeting of Stockholders to be held on May 14, 2026.
Document Financial Statement Error Correction [Flag]	false
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	WLK
Security Exchange Name	NYSE
1.625% Senior Notes Due 2029
Document Information [Line Items]
Title of 12(b) Security	1.625% Senior Notes due 2029
Trading Symbol	WLK29
Security Exchange Name	NYSE

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities
Net income (loss)	$ (1,471)	$ 647	$ 522
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	1,178	1,114	1,097
Stock-based compensation expense	41	41	43
Loss from disposition and write-off of assets and accelerated depreciation and amortization	359	43	45
Impairment of goodwill and long-lived assets	727	0	475
Deferred income taxes	(177)	(35)	(175)
Other gains, net	(7)	(27)	(3)
Changes in operating assets and liabilities, net of effect of business acquisitions
Accounts receivable	15	87	225
Inventories	51	(97)	250
Prepaid expenses and other current assets	(11)	(35)	(19)
Accounts payable	(67)	(20)	(26)
Accrued and other liabilities	89	(213)	170
Other, net	(262)	(191)	(268)
Net cash provided by operating activities	465	1,314	2,336
Cash flows from investing activities
Additions to investments in unconsolidated subsidiaries	(33)	(26)	(25)
Additions to property, plant and equipment	(995)	(1,008)	(1,034)
Payments to Acquire Debt Securities, Available-for-Sale	(272)	0	0
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	68	0	0
Other, net	9	33	22
Net cash used for investing activities	(1,223)	(1,001)	(1,037)
Cash flows from financing activities
Distributions to noncontrolling interests	(51)	(49)	(54)
Dividends paid	(272)	(264)	(221)
Proceeds from senior notes issuance, net	1,187	0	0
Repayment of senior notes	(254)	(300)	0
Repurchase of common stock for treasury	(63)	(60)	(23)
Other, net	(17)	23	53
Net cash provided by (used for) financing activities	530	(650)	(245)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	33	(47)	19
Net increase (decrease) in cash, cash equivalents and restricted cash	(195)	(384)	1,073
Cash, cash equivalents and restricted cash at beginning of the year	2,935	3,319	2,246
Cash, cash equivalents and restricted cash at end of the year	$ 2,740	$ 2,935	$ 3,319

Stock-Based Compensation

12 Months Ended

Dec. 31, 2025

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

Under the Westlake Corporation 2013 Omnibus Incentive Plan (as amended and restated in 2023, the "2013 Plan"), all employees and non-employee directors of the Company, as well as certain individuals who have agreed to become the Company's employees, are eligible for awards. Shares of common stock may be issued as authorized in the 2013 Plan. At the discretion of the administrator of the 2013 Plan, employees and non-employee directors may be granted awards in the form of stock options, stock appreciation rights, stock awards, restricted stock units or cash awards (any of which may be a performance award). Outstanding stock option awards have a 10-year term and vest ratably on an annual basis over a three-year period. Outstanding restricted stock units and performance stock units vest at the end of a one to five-year period. In accordance with accounting guidance related to share-based payments, stock-based compensation expense for all stock-based compensation awards is based on estimated grant-date fair value. The Company recognizes these stock-based compensation costs net of a forfeiture rate and on a straight-line basis over the requisite service period of the award for only those shares expected to vest. For the years ended December 31, 2025, 2024 and 2023, the total recognized stock-based compensation expense related to equity awards issued under the 2013 Plan was $42, $41 and $40, respectively.

Option activity and changes during the year ended December 31, 2025 were as follows:


	Options	Weighted Average Exercise Price		Weighted Average Remaining Term (Years)	Aggregate Intrinsic Value
Outstanding at December 31, 2024	1,088,507	$	96.31
Granted	260,834	110.15
Exercised	(85,492)	45.06
Cancelled	(48,592)	120.57
Outstanding at December 31, 2025	1,215,257	$	101.91	6.0	$	2
Exercisable at December 31, 2025	829,130	$	93.10	4.7	$	2

For options outstanding at December 31, 2025, the options had the following range of exercise prices:


Range of Prices	Options Outstanding	Weighted Average Remaining Contractual Life (Years)
$44.42 - $65.81	242,037	3.1
$79.83 - $86.54	219,531	4.3
$107.75 - $108.12	208,932	5.0
$110.15 - $110.15	233,222	9.1
$122.65 - $144.49	311,535	7.6

The aggregate intrinsic value in the table above represents the total intrinsic value (the difference between the Company's closing stock price on the last trading day of the year and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on December 31, 2025. This amount changes based on the fair market value of the Company's common stock. For the years ended December 31, 2025, 2024 and 2023, the total intrinsic value of options exercised was $3, $9 and $34, respectively.

As of December 31, 2025, $9 of total unrecognized compensation cost related to stock options is expected to be recognized over a weighted-average period of 1.7 years. Income tax benefits of $1, $2 and $4 were realized from the exercise of stock options during the years ended December 31, 2025, 2024 and 2023, respectively.


	Stock Option Grants
	Year Ended December 31,
	2025			2024			2023
Weighted average fair value	$	36.52		$	52.17		$	44.91
Risk-free interest rate	4.3		%	4.3		%	4.0		%
Expected life in years	5			5			5
Expected volatility	37.3		%	38.4		%	39.1		%
Expected dividend yield	1.9		%	1.2		%	1.1		%

Non-vested restricted stock units as of December 31, 2025 and changes during the year ended December 31, 2025 were as follows:


	Number of Units	Weighted Average Grant Date Fair Value
Nov-vested at December 31, 2024	591,204	$	121.70
Granted	290,064	104.31
Vested	(210,522)	104.57
Forfeited	(63,299)	120.30
Nov-vested at December 31, 2025	607,447	$	119.35

As of December 31, 2025, there was $32 of unrecognized stock-based compensation expense related to non-vested restricted stock units. This cost is expected to be recognized over a weighted-average period of 1.8 years. The total fair value of restricted stock units that vested during the years ended December 31, 2025, 2024 and 2023 was $23, $30 and $28, respectively.

Performance stock unit payout is based on the greater of the average annual economic-value added results for the Company (equal to net operating profit after tax less a capital charge based upon the weighted average cost of capital) and relative total shareholder return as compared to a peer group of companies. The units have payouts that range from zero to 200 percent of the target award.

Non-vested performance stock units as of December 31, 2025 and changes during the year ended December 31, 2025 were as follows:


	Number of Units	Weighted Average Grant Date Fair Value
Nov-vested at December 31, 2024	186,482	$	166.47
Granted	86,723	118.12
Vested	(61,314)	147.98
Forfeited	(19,782)	149.67
Nov-vested at December 31, 2025	192,109	$	152.27

As of December 31, 2025, there was $12 of unrecognized stock-based compensation expense related to non-vested performance stock units. This cost is expected to be recognized over a weighted-average period of 1.7 years. The total fair value of performance stock units that vested during the years ended December 31, 2025, 2024 and 2023 was $7, $10 and $13, respectively.

The Company used a Monte Carlo simulation model to value the performance stock units on the grant date. The expected term is based on the three-year performance period. The table below presents the assumptions used in determining grant date fair value. Volatility was calculated using historical trends of the Company's common stock price.


	Performance Stock Units
	Year Ended December 31,
	2025			2024			2023
Risk-free interest rate	4.2		%	4.5		%	4.4		%
Expected life in years	2.86			2.88			2.87
Expected volatility of Westlake Corporation common stock	31.6		%	33.8		%	40.8		%
Expected volatility of peer companies	24.7% - 53.2%			25.9% - 46.4%			26.6% - 53.2%
Average correlation coefficient of peer companies	0.58			0.60			0.61
Grant date fair value	$	118.12		$	183.39		$	167.76

Westlake Chemical Partners LP Awards

The Company's wholly-owned subsidiary and the general partner of Westlake Partners, Westlake Chemical Partners GP LLC ("Westlake Partners GP"), maintains a unit-based compensation plan for directors and employees of Westlake Partners GP and Westlake Partners.

The Westlake Partners 2014 Long-term Incentive Plan ("Westlake Partners 2014 Plan") permits various types of equity awards including but not limited to grants of phantom units and restricted units. Awards granted under the Westlake Partners 2014 Plan may be settled with Westlake Partners units or in cash or a combination thereof. Compensation expense for these awards was not material to the Company's consolidated financial statements for the years ended December 31, 2025, 2024 and 2023.

Income Taxes (Reconciliation Of Taxes Computed At The Statutory Rate To Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
Provision for federal income tax, at statutory rate	$ (335)	$ 197	$ 148
State income tax provision, net of federal income tax effect	(2)	6	7
Foreign income tax rate differential		7	(15)
Other adjustments		(10)	(11)
Change in valuation allowance		62	76
U.S. federal research and development credits	(14)	(16)	(54)
Uncertain Income Tax Positions		9	14
Goodwill impairment	151	0	26
Change in state apportionment and tax rates		45	(6)
Nontaxable and nondeductible items, other	1
Worldwide changes in unrecognized tax benefits	1
Noncontrolling interests	(6)	(9)	(7)
Provision for (benefit from) income taxes	$ (126)	$ 291	$ 178
Percentage
U.S. federal statutory income tax rate	21.00%
State and local income tax, net of federal income tax effect	0.10%
Tax credits	0.90%
Goodwill impairment	(9.50%)
Nontaxable and nondeductible items, other	(0.10%)
Worldwide changes in unrecognized tax benefits	(0.10%)
Noncontrolling interest	0.40%
Effective Tax Rate	7.90%
Canada
Amount
Foreign income tax rate differential	$ 23
Other adjustments	$ (9)
Percentage
Foreign tax effects	(1.40%)
Other adjustments	0.60%
Netherlands
Amount
Other adjustments	$ (15)
Change in valuation allowance	$ 79
Percentage
Other adjustments	0.90%
Changes in valuation allowance	(4.90%)
Other foreign jurisdictions
Amount
Foreign income tax rate differential	$ (1)
Percentage
Foreign tax effects	0.10%
United States
Amount
Other adjustments	$ 1
Percentage
Other adjustments	(0.10%)