Net income attributable to common shareholders Net Income Loss Available To Common Stockholders Net income available to common stockholders after adjustments for net income attributable to participating securities. Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Restructuring and Related Cost, Expected Cost Remaining Restructuring and Related Cost, Expected Cost Remaining Debt Securities, Available-for-Sale Debt Securities, Available-for-Sale [Table Text Block] Large-Cap Mutual Funds Defined Benefit Plan, Equity Securities, Large Cap [Member] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Schedule Of Estimated Future Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] 2030 Unrecorded Unconditional Purchase Obligation, to be Paid, Year Five Earnings and Dividends Per Share [Abstract] Earnings and Dividends Per Share [Abstract] Earnings and Dividends Per Share [Abstract] Award Timing Predetermined Award Timing Predetermined [Flag] Income tax provision on available-for-sale investments OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number Additional Paid-in Capital Additional Paid-in Capital [Member] IPO IPO [Member] U.S. federal research and development credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Tabular List, Table Tabular List [Table Text Block] Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Supplemental Information Additional Financial Information Disclosure [Text Block] Incurred and paid lease payments Office Lease Expense Lease expense incurred for office space. Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Schedule Of Carrying And Fair Values Of Long-Term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Goodwill [Line Items] Goodwill [Line Items] Adjustment to Compensation: Adjustment to Compensation [Axis] Related Party And Affiliate Transactions Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Stock, Class of Stock [Table] Stock, Class of Stock [Table] Plant capacity (in lbs) Related Party Transaction, Plant Capacity Related Party Transaction, Plant Capacity Corporate Joint Venture Corporate Joint Venture [Member] Total Current Current Income Tax Expense (Benefit) Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions [Table] Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions [Table] Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance share units, including but not limited to volatility of common stock, volatility of peer companies average coefficient of peer companies and risk- free interest rate. Adjustment to Compensation, Amount Adjustment to Compensation Amount Pension Plan Pension Plan [Member] Unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Principles of Consolidation Consolidation, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Stock Options Share-Based Payment Arrangement, Option [Member] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Percentage Effective Income Tax Rate Reconciliation, Percent [Abstract] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Dividends declared Dividends, Common Stock, Cash Dividends, Common Stock, Cash Impairment of goodwill and long-lived assets Asset Impairment Charges Total Westlake Corporation stockholders' equity Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Schedule Of Property, Plant And Equipment Property, Plant and Equipment [Table Text Block] Common Stock, shares authorized Common Stock, Shares Authorized Expected net loss, Next Fiscal Year Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] State and Local Jurisdiction State and Local Jurisdiction [Member] Cover [Abstract] Cover [Abstract] Maximum Maximum [Member] Weighted Average Exercise Price, Exercisable, ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Life Finite-Lived Intangible Asset, Useful Life Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment, Net [Abstract] Prepaid expenses and other current assets Increase (Decrease) In Prepaid Expenses And Other Current Assets Increase (Decrease) In Prepaid Expenses And Other Current Assets Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Litigation Plaintiffs [Axis] Litigation Plaintiffs [Axis] Litigation Plaintiffs Aggregate Intrinsic Value [Abstract] Aggregate Intrinsic Value [Abstract] Aggregate Intrinsic Value [Abstract] Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Customer relationships, net Net Finite-Lived Intangible Assets, Net Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Loss from disposition and write-off of assets and accelerated depreciation and amortization Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Balance at beginning of period Balance at end of period Investment Owned, Fair Value Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other Assets Other Assets [Member] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Other Assets, Net Property, Plant and Equipment, Planned Major Maintenance Activities, Policy [Policy Text Block] Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Geographic Information For Sales To External Customers And Long-Lived Assets Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Financial Position Location, Activity, Accrual [Axis] Statement of Financial Position Location, Activity, Accrual [Axis] Proceeds from senior notes issuance, net Proceeds from Issuance of Debt Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Share-based Payment Arrangement, Performance Shares, Activity Share-Based Payment Arrangement, Performance Shares, Activity [Table Text Block] Partners' Capital Account, Units, Sold in Private Placement Partners' Capital Account, Units, Sold in Private Placement Schedule of Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Other intangible assets, net Other Intangible Assets, Net Comprehensive income attributable to noncontrolling interests, net of tax of $2, $2 and $3 for 2025, 2024 and 2023, respectively Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Line of Credit Facility [Table] Line of Credit Facility [Table] Asset Retirement Obligations Asset Retirement Obligation [Policy Text Block] Defined Benefit Plan, Funding Status [Extensible Enumeration] Defined Benefit Plan, Funding Status [Extensible Enumeration] Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Axis] Exercise Price Range [Axis] Balances at beginning of period Balances at end of period Restructuring Reserve Letter of Credit Letter of Credit [Member] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Accrued and other liabilities Operating Lease, Liability, Current Document Fiscal Period Focus Document Fiscal Period Focus Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Cypress Interstate Pipeline L.L.C Cypress Interstate Pipeline L.L.C [Member] Cypress Interstate Pipeline L.L.C [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Award Timing Method Award Timing Method [Text Block] Litigation Case [Domain] Litigation Case [Domain] Award Type [Axis] Award Type [Axis] Cumulative Foreign Currency Exchange, Net of Tax Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Sulphur Brine Dome Sulphur Brine Dome [Member] Sulphur Brine Dome Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Business Combinations Business Combination [Policy Text Block] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Changes in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Shares issued—stock- based compensation, shares Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Marketable Securities [Line Items] Marketable Securities [Line Items] Retirement Plan Settlement Type [Domain] Retirement Plan Settlement Type [Domain] Retirement Plan Settlement Type [Domain] Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Noncurrent deferred tax asset Deferred Tax Assets, Net of Valuation Allowance Foreign exchange effects Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Allowance for Credit Losses Credit Loss, Financial Instrument [Policy Text Block] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Business Combination, Consideration Transferred Business Combination, Consideration Transferred Damages awarded Loss Contingency, Damages Awarded, Value Entity Emerging Growth Company Entity Emerging Growth Company Long-term debt, maturity, year three Long-Term Debt, Maturity, Year Three Total before tax Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Options, Outstanding, beginning balance Options, Outstanding, ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Average correlation coefficient of peer companies Share Base Compensation Average Correlation Coefficient of Peer Companies Share Base Compensation Average Correlation Coefficient of Peer Companies Restricted cash and cash equivalents Restricted Cash and Cash Equivalent Purchases and lease expense to related parties Purchases And Lease Expense Payments made for purchases and lease expenses. Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Year 1 Defined Benefit Plan, Expected Future Benefit Payment, Year One TTWF LP TTWF LP [Member] TTWF LP [Member] Share-Based Payment Arrangement, Option, Exercise Price Range [Table] Share-Based Payment Arrangement, Option, Exercise Price Range [Table] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Non-Cash Investing Activity [Abstract] Non-Cash Investing Activity [Abstract] Non-Cash Investing Activity [Abstract] Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Noncurrent assets Assets for Plan Benefits, Defined Benefit Plan Change in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 3.50% Senior Notes Due 2032 Three Point Five Zero Percent Senior Notes Due Twenty Thirty Two [Member] Three Point Five Zero Percent Senior Notes Due Twenty Thirty Two [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Change in benefit obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Number of Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income tax provision (benefit) Provision for (benefit from) income taxes Provision for (benefit from) income taxes Income Tax Expense (Benefit) $44.42 - $65.81 Range One [Member] Range one [Member] Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Document Information [Line Items] Document Information [Line Items] Preferred stock, shares issued Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Underfunded Plan Defined Benefit Plan, Underfunded Plan [Member] Property, plant and equipment, gross Property, Plant and Equipment, Gross Property, Plant and Equipment Property, Plant and Equipment [Member] Retirement Plan Funding Status [Domain] Defined Benefit Plan, Funding Status [Domain] Employer contributions to plans Defined Contribution Plan, Employer Discretionary Contribution Amount Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] US federal Income Tax Paid, Federal, after Refund Received Buildings and improvements Building and Building Improvements [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Redemption price percentage Debt Instrument, Redemption Price, Percentage Accrued and other liabilities Accrued Liabilities, Current Other adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Number of Shares, Non-vested, beginning balance Number of Shares, Non-vested, ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Warranty Costs Standard Product Warranty, Policy [Policy Text Block] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Loan term Debt Instrument, Term Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Investments in and Advances to Affiliates, at Fair Value [Roll Forward] Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Ethylene Antitrust Litigation Proceedings Ethylene Antitrust Litigation Proceedings [Member] Ethylene Antitrust Litigation Proceedings Property, plant and equipment, useful life, minimum (in years) Property, Plant and Equipment, Useful Life Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Schedule of Multiemployer Plans [Table] Multiemployer Plan [Table] Schedule Of Weighted Average Value And Assumptions For Fair Value Of Options Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Prior service credit Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation expense on property, plant and equipment Depreciation Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Standby Letters of Credit Standby Letters of Credit [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments $122.65 - $144.49 Range Five [Member] Range Five [Member] Reasonably possible loss contingencies related to environmental matters Environmental Exit Costs, Reasonably Possible Additional Loss Entity Address, State or Province Entity Address, State or Province Operating lease right-of-use assets impairment Operating Lease, Impairment Loss Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Year 4 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Total current liabilities Liabilities, Current Inventories Deferred Tax Assets, Inventory $79.83 - $86.54 Range Two [Member] Range two [Member] Restructuring and Related Cost, Cost Incurred to Date Restructuring and Related Cost, Cost Incurred to Date Individual: Individual [Axis] Employer Contributions to Plan Defined Contribution Plan, Cost Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Schedule of Asset Retirement Obligations Schedule of Asset Retirement Obligations [Table Text Block] Dividends paid Payments of Ordinary Dividends, Common Stock Document Quarterly Report Document Annual Report Settlements (1) Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 4.375% Senior Notes Due 2047 Four Point Three Seven Five Percent Senior Notes Due Twenty Forty Seven [Member] Four Point Three Seven Five Percent Senior Notes Due Twenty Forty Seven [Member] Defined Benefit Plans Defined Benefit Plans [Member] Defined Benefit Plans [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Repayment of senior notes Repayment of senior notes Repayments of Long-Term Debt Research and experimental expenditures Deferred Tax Asset, In-Process Research and Development Entity Interactive Data Current Entity Interactive Data Current Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Weighted Average Remaining Contractual Life (Years) Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term Additions to investments in unconsolidated subsidiaries Additions to investments in unconsolidated subsidiaries The cash outflows associated with capital contributions in unconsolidated subsidiaries, as well as purchases of noncontrolling interest during the period. Funded status, end of year Defined Benefit Plan, Funded (Unfunded) Status of Plan Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Aggregate Intrinsic Value, Exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards Fixed Annuity Fixed Annuity [Member] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Discount rate for service cost Defined Benefit Plan, Assumptions Used Calculating Service Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Service Cost, Discount Rate Ownership [Domain] Ownership [Domain] Total other intangible assets Total Other Intangible Assets [Member] Total Other Intangible Assets [Member] Year 2 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Entity Central Index Key Entity Central Index Key PEO Name PEO Name Asset Retirement Obligation, Beginning Balance Asset Retirement Obligation, Ending Balance Asset Retirement Obligation Net sales Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Defined Benefit Plan [Table] Defined Benefit Plan [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Financial Instruments Financial Instruments Disclosure [Text Block] Discount rate for interest cost Defined Benefit Plan, Assumptions Used Calculating Interest Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Interest Cost, Discount Rate Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid U.S. federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Long-term debt, net Long-Term Debt, Excluding Current Maturities Nonrelated Party Nonrelated Party [Member] 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Vesting [Domain] Vesting [Domain] Bond Mutual Funds Bonds [Member] Environmental Remediation And Other Plant Mothballing Costs Environmental Remediation And Other Plant Mothballing Costs [Member] Environmental Remediation And Other Plant Mothballing Costs Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Schedule Of Range Of Exercise Prices For Outstanding Options Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Retirement Plan Funding Status [Axis] Defined Benefit Plan, Funding Status [Axis] Ownership [Axis] Ownership [Axis] Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Fixed Lease Payments Fixed Lease Payments [Member] Fixed Lease Payments [Member] Insurance recoveries Insurance Recoveries Fair Value as of Grant Date Award Grant Date Fair Value Operating Loss Carryforwards Operating Loss Carryforwards Worldwide changes in unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Schedule Of Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Number of Shares, Granted Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Number of Shares, Forfeited Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Related Party Transaction [Line Items] Related Party Transaction [Line Items] Contract with Customer, Liability, Payment Advance Contract with Customer, Liability, Payment Advance Advance payment representing fixed portion of total transaction price Treasury Stock Purchase Price, Repurchase Program Treasury Stock Purchase Price, Repurchase Program Aggregate purchase price of common stock repurchased by the entity under share repurchase program. Recorded using the cost method. Depreciation and amortization Investments in and Advances to Affiliates, at Fair Value, Gross Reductions Fair Value Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Standard Product Warranty Accrual, Decrease for Payments Standard Product Warranty Accrual, Decrease for Payments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Weighted Average Remaining Term (Years), Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Germany GERMANY Schedule of Accounts Payable Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Swingline Loan Swingline Loan [Member] Swingline Loan [Member] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Year 3 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Amortization of net gain (loss) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Non-PEO NEO Non-PEO NEO [Member] Aggregate Intrinsic Value, Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Number of major customers Concentration Risk, Number of Major Customers Concentration Risk, Number of Major Customers Brazil BRAZIL Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] Unconditional purchase obligations Purchase Obligation, Fiscal Year Maturity [Abstract] Asset Retirement Obligation, Current Asset Retirement Obligation, Current Interest income Interest Income, Other Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Subsidiary, Sale of Stock [Axis] Sale of Stock [Axis] Other Other Intangible Assets [Member] Land Land [Member] Award Type [Domain] Award Type [Domain] New Credit Agreement New Credit Agreement [Member] New Credit Agreement [Member] Housing and Infrastructure Products Segment Housing and Infrastructure Products [Member] Housing and Infrastructure Products [Member] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Noncontrolling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Canada CANADA Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Accounts receivable Increase (Decrease) in Accounts and Other Receivables Compensation Amount Outstanding Recovery Compensation Amount Thereafter Unrecorded Unconditional Purchase Obligation, to be Paid, after Year Five Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Trade name, Gross Finite-Lived Trade Names, Gross Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Expected dividend yield Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Restructuring Charges Restructuring Charges [Member] Retirement Plan Type [Domain] Retirement Plan Type [Domain] China CHINA MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Foreign tax effects Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Organization Consolidation And Presentation Of Financial Statements [Line Items] Organization Consolidation And Presentation Of Financial Statements [Line Items] Organization consolidation and presentation of financial statements [Line Items]. Pension Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Production Facility, Annual Capacity, VCM Production Facility, Annual Capacity, VCM Production Facility, Annual Capacity, VCM Schedule of Amounts Recognized in Other Comprehensive Income (Loss) Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Customer relationships Finite-Lived Customer Relationships, Gross Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Goodwill, Gross Goodwill, Gross Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Long-term debt, maturity, year one Long-Term Debt, Maturity, Year One Financial Instruments [Domain] Financial Instruments [Domain] Deferred tax liabilities—total Deferred Tax Liabilities, Gross Schedule of Estimated Useful Lives of Assets Schedule Of Estimated Useful Lives Of Assets [Table Text Block] Table of estimated useful lives of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Long-term debt, maturity, year five Long-Term Debt, Maturity, Year Five Performance Stock Units Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Lease related asset and liability Lease related asset and liability [Table Text Block] [Table Text Block] for Lease related asset and liability [Table] Nontaxable and nondeductible items, other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Inventories Inventories Inventory, Net Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] LACC, LLC LACC, LLC [Member] LACC, LLC [Member] Minimum Minimum [Member] Net income attributable to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Goodwill, Measurement Period Adjustment Goodwill, Measurement Period Adjustment Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts payable Accounts Payable, Current Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Operating Lease, Payments Operating Lease, Payments Standard Product Warranty Accrual, Increase for Warranties Issued Standard Product Warranty Accrual, Increase for Warranties Issued Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Foreign Current Foreign Tax Expense (Benefit) Restructuring Plan [Domain] Restructuring Plan [Domain] Goodwill [Roll Forward] Goodwill [Roll Forward] Cliff Vest Cliff Vest [Member] Cliff Vest [Member] Commitments And Contingencies Commitments and Contingencies Disclosure [Text Block] Diluted (in shares) Weighted average common shares—diluted Weighted Average Number of Shares Outstanding, Diluted Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions [Line Items] Schedule Of Share Based Payment Award Performance Share Units Valuation Assumptions [Line Items] [Line Items] for Tabular disclosure of the significant assumptions used during the year to estimate the fair value of performance share units, including but not limited to volatility of common stock, volatility of peer companies average coefficient of peer companies and risk- free interest rate. Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Reconciliation of Assets from Segment to Consolidated [Table] Reconciliation of Assets from Segment to Consolidated [Table] Auditor [Abstract] Auditor [Abstract] Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Uncertain Income Tax Positions Effective Income Tax Rate Reconciliation, Uncertain Income Tax Positions Effective Income Tax Rate Reconciliation, Uncertain Income Tax Positions Preferred stock, shares outstanding Preferred Stock, Shares Outstanding State Current State and Local Tax Expense (Benefit) Long-Term Debt Long-Term Debt [Text Block] Document Transition Report Document Transition Report 1.625% Senior Notes Due 2029 One Point Six Two Five Percentage Senior Notes Due Twenty Twenty Nine [Member] [Domain] One 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(Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Asset Retirement Obligation, Liabilities Incurred Asset Retirement Obligation, Liabilities Incurred Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Common Stock, Voting Rights, Number of Votes Per Share Common Stock, Voting Rights Income Tax Paid, by Individual Jurisdiction [Table] Income Tax Paid, by Individual Jurisdiction [Table] Accelerated Depreciation and Amortization Accelerated Depreciation and Amortization [Member] Accelerated Depreciation and Amortization City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Capitalized interest Interest Costs Capitalized Lotte Chemical Corporation Lotte Chemical Corporation [Member] Lotte Chemical Corporation [Member] One-Time Lump Sum Payment One-Time Lump Sum Payment [Member] One-Time Lump Sum Payment Investments in and Advances to Affiliates, Proportionate Share Of Production, Mass Investments in and Advances to Affiliates, Proportionate Share Of Production, Mass Investments in and Advances to Affiliates, Proportionate Share Of Production, Mass Contract with Customer, Contract Asset, Contract Liability, and Receivable Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Total net deferred tax liabilities Deferred Tax Liabilities, Net Restructuring, transaction and integration-related costs Restructuring, transaction and integration-related costs Restructuring, transaction and integration-related costs Westlake UV Coatings (Shanghai) Co., Ltd. Westlake UV Coatings (Shanghai) Co., Ltd. [Member] Westlake UV Coatings (Shanghai) Co., Ltd. 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Per Share [Table] Cash flows from financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Other foreign jurisdictions Foreign Tax Jurisdiction, Other [Member] Partners' Capital Account, Units Partners' Capital Account, Units Variable Rate [Domain] Variable Rate [Domain] Contract with Customer, Liability Contract with Customer, Liability All Adjustments to Compensation All Adjustments to Compensation [Member] 3.375% Senior Notes Due 2061 Three Point Three Seven Five Percent Senior Notes Due Twenty Sixty One [Member] Three Point Three Seven Five Percent Senior Notes Due Twenty Sixty One Amendment Flag Amendment Flag Schedule Of Fair Value Of Pension Plan Assets Schedule of Allocation of Plan Assets [Table Text Block] Other Postretirement Benefits Plan Other Postretirement Benefits Plan [Member] Westlake Chemical Partners LP Oil and Gas and Mining, Proportionate Consolidation, Interest in Unincorporated Joint Venture or Partnership [Policy Text Block] Termination Date Trading Arrangement Termination Date Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Deferred Cost, Amortization Period Deferred Cost, Amortization Period Deferred Cost, Amortization Period PnYnMnDTnHnMnS Caustic Soda Antitrust Proceedings Caustic Soda Antitrust Proceedings [Member] Caustic Soda Antitrust Proceedings Weighted Average Lease Discount Rate Operating Lease, Weighted Average Discount Rate, Percent Consolidated partnerships Deferred Tax Liabilities, Parent's Basis In Consolidated Partnerships Deferred Tax Liabilities, Parent's Basis In Consolidated Partnerships Basic (in shares) Weighted average common shares—basic Weighted Average Number of Shares Outstanding, Basic Inventory Write-down Inventory Write-down Inventory Write-down American Air Liquide Holdings, Inc. Director [Member] Options, Exercisable, ending balance Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Related Party Transaction [Domain] Related Party Transaction [Domain] Exercise Price Range [Domain] Exercise Price Range [Domain] Subsequent Events [Abstract] Segment Reporting [Abstract] Segment Reporting [Abstract] Housing Products Housing Products [Member] Housing Products Debt Disclosure [Abstract] Debt Disclosure [Abstract] Other income (expense) Nonoperating Income (Expense) [Abstract] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Reclassification from AOCI, Current Period, Tax Reclassification from AOCI, Current Period, Tax Expected volatility of peer companies Share Based Compensation Arrangements Expected Volatility Rate of Peer Companies Share Based Compensation Arrangements Expected Volatility Rate of Peer Companies Accounts Receivable, before Allowance for Credit Loss Accounts Receivable, before Allowance for Credit Loss Inventory, Net [Abstract] Inventory, Net [Abstract] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Defined Benefit Plan, Target Allocation Percentage of Assets, Discretionary Range Defined Benefit Plan, Target Allocation Percentage of Assets, Discretionary Range Defined Benefit Plan, Target Allocation Percentage of Assets, Discretionary Range Federal and state taxes Income Taxes Receivable, Current Years 6 to 10 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Geographic Distribution [Axis] Geographic Distribution [Axis] Pernis Facility Closure Pernis Facility Closure [Member] Pernis Facility Closure Brazilian Contractual Indemnification Lawsuit Brazilian Contractual Indemnification Lawsuit [Member] Brazilian Contractual Indemnification Lawsuit Use of Estimates Use of Estimates, Policy [Policy Text Block] Current liabilities Liability, Defined Benefit Plan, Current Litigation settlement, amount awarded to other party Litigation Settlement, Amount Awarded to Other Party Defined Benefit Plan, Funded Status, Percentage Defined Benefit Plan, Funded Status, Percentage Defined Benefit Plan, Funded Status, Percentage Options Outstanding Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Subsequent Events Subsequent Events [Text Block] Insider Trading Arrangements [Line Items] Purchases from related parties Related Party Transaction, Purchases from Related Party Weighted Average Exercise Price, Cancelled (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Equity Securities Equity Securities Equity Securities [Member] Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Distributions to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Additions for tax positions of current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year Louisiana LOUISIANA Partners' Units, Maximum Aggregate Offering Amount, ATM Partners' Units, Maximum Aggregate Offering Amount, ATM Partners' Units, Maximum Aggregate Offering Amount, ATM Asset-Backed Securities Asset-Backed Securities [Member] Consolidation Items [Axis] Consolidation Items [Axis] Unamortized debt issuance costs Unamortized Debt Issuance Expense Variable Rate [Axis] Variable Rate [Axis] Kentucky KENTUCKY Counterparty Name [Axis] Counterparty Name [Axis] Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] Available-for-sale securities Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate Debt Securities Corporate Debt Securities [Member]