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Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Long-Term Debt Debt Disclosure [Text Block] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Total selling, general and administrative expenses Total selling, general and administrative expenses Total selling, general and administrative expenses 3.375% Senior Notes Due 2030 Three Point Three Seven Five Senior Notes Due Twenty Thirty [Member] Three Point Three Seven Five Senior Notes Due Twenty Thirty [Member] Distributions to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Common stock, $0.01 par value, 300,000,000 shares authorized; 134,651,380 and 134,651,380 shares issued at March 31, 2025 and December 31, 2024, respectively Common Stock, Value, Issued Performance Materials Performance Materials [Member] Performance Materials Westlake Chemical Partners LP Partners' Capital Notes Disclosure [Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Litigation Status [Axis] Litigation Status [Axis] Other, net Payments for (Proceeds from) Other Investing Activities Alternate Base Rate Alternate Base Rate [Member] Alternate Base Rate [Domain] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Preferred stock, $0.01 par value, 50,000,000 shares authorized; no shares issued and outstanding Preferred Stock, Value, Issued Feedstock, additives, chemicals and other raw materials Inventory, Work in Process and Raw Materials, Net of Reserves Borrowing outstanding Line of Credit Facility, Fair Value of Amount Outstanding Basic (in dollars per share) Earnings Per Share, Basic Accounts payable Increase (Decrease) in Accounts Payable Environmental Remediation Contingency [Domain] Environmental Remediation Contingency [Domain] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Ownership [Domain] Ownership [Domain] Capital expenditures incurred but not yet paid Capital Expenditures Incurred but Not yet Paid Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Schedule of Goodwill [Table] Goodwill [Table] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Total current liabilities Liabilities, Current 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] Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Total assets Total assets Assets Cost of sales Cost of sales Cost of Goods and Services Sold Federal and state taxes Income Taxes Receivable, Current Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Other liabilities Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Dividends Per Share Dividends Per Share [Table Text Block] [Table Text Block] for Dividends Per Share [Table] Commitments and contingencies (Note 13) Commitments and Contingencies Termination Date Trading Arrangement Termination Date Basis of Financial Statements Business Description and Basis of Presentation [Text Block] Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Net sales Revenues 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 Entity Address, City or Town Entity Address, City or Town One to five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Debt Instrument [Axis] Debt Instrument [Axis] Partner Type [Axis] Partner Type [Axis] Net income (loss) attributable to Westlake Corporation Net income attributable to Westlake Corporation Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Summary Of Carrying And Fair Values Of Long-Term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Antitrust Proceedings Caustic Soda Antitrust Proceedings [Member] Caustic Soda Antitrust Proceedings Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Environmental Loss Contingencies [Table] Loss Contingencies [Table] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] After ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 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] Entity File Number Entity File Number Housing Products Housing Products [Member] Housing Products Document Fiscal Year Focus Document Fiscal Year Focus Noncontrolling Interests Noncontrolling Interest [Member] Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Common stock repurchased Treasury Stock, Value, Acquired, Cost Method Entity Address, Address Line Two Entity Address, Address Line Two Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Finished products Inventory, Finished Goods, Net of Reserves Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Insider Trading Arrangements [Line Items] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Brazilian Contractual Indemnification Lawsuit Brazilian Contractual Indemnification Lawsuit [Member] Brazilian Contractual Indemnification Lawsuit PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Adjustment to Compensation: Adjustment to Compensation [Axis] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Document Transition Report Document Transition Report Supranational securities Supranational Securities [Member] Supranational Securities Document Quarterly Report Document Quarterly Report One to five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Litigation Case [Domain] Litigation Case [Domain] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Restricted cash and cash equivalents Restricted Cash and Cash Equivalents Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Litigation Status [Domain] Litigation Status [Domain] Related Party [Axis] Related and Nonrelated Parties [Axis] Basic (in shares) Weighted average common shares—basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Partners' Units, Maximum Aggregate Offering Amount, ATM Partners' Units, Maximum Aggregate Offering Amount, ATM Partners' Units, Maximum Aggregate Offering Amount, ATM Document Information [Table] Document Information [Table] Total equity Beginning balances Ending balances Equity, Including Portion Attributable to Noncontrolling Interest Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name Net income attributable to participating securities Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Entity Filer Category Entity Filer Category Purchase of available-for-sale securities Payments to Acquire Debt Securities, Available-for-Sale Environmental Loss Contingencies [Line Items] Loss Contingencies [Line Items] Letter of Credit Letter of Credit [Member] Company Selected Measure Name Company Selected Measure Name