Net income attributable to common stockholders Net Income Loss Available To Common Stockholders Net income available to common stockholders after adjustments for net income attributable to participating securities. Deferred turnaround costs, net Deferred Turnaround Costs, Net Deferred Turnaround Costs, Net Adjustments to reconcile net income to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Direct Purchasers Direct Purchasers [Member] Direct Purchasers Statistical Measurement [Domain] Statistical Measurement [Domain] 3.6% Senior Notes Due 2026 Three Point Six Percent Senior Notes Due Twenty Twenty-Six [Member] Three Point Six Percent Senior Notes Due Twenty Twenty-Six [Member] Repayment of senior notes Repayment of senior notes Repayments of Long-Term Debt Capital expenditures Segment, Expenditure, Addition to Long-Lived Assets Ownership interest (in shares) Partners' Capital Account, Units Earnings and Dividends Per Share [Abstract] Earnings and Dividends Per Share [Abstract] Earnings and Dividends Per Share [Abstract] Cover [Abstract] Cover [Abstract] Net increase (decrease) in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Other liabilities, current Other Liabilities, Current Trading Symbol Trading Symbol Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Asset Retirement Obligation, Revision of Estimate Asset Retirement Obligation, Revision of Estimate Ownership interest (percent) Equity Method Investment, Ownership Percentage Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest All Trading Arrangements All Trading Arrangements [Member] Held-to-maturity securities Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Current Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Non-NEOs Non-NEOs [Member] Line of credit permitted increase Line Of Credit Facility Permitted Increase The permitted amount the line of credit facility may be increased by, under certain circumstances if certain lenders agree to commit to such an increase. Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Dividends per common share (in usd per share) Common Stock, Dividends, Per Share, Declared Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Income taxes Income Taxes Paid, Net Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Equity method investments Equity Method Investments Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Fair Value Measurements Fair Value Disclosures [Text Block] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Other assets, net Deferred Costs and Other Assets Award Timing Disclosures [Line Items] Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Investment, Name [Domain] Investment, Name [Domain] Other Performance Measure, Amount Other Performance Measure, Amount Goodwill [Line Items] Goodwill [Line Items] Other Other Receivables, Net, Current Operating lease liabilities Operating Lease, Liability, Noncurrent Operation and Maintenance Operation and Maintenance [Member] Operation and Maintenance [Member] Loss from disposition and write-off of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Restructuring Charges [Abstract] Restructuring Charges [Abstract] Assumed exercise of options and vesting of performance stock units (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Entity Tax Identification Number Entity Tax Identification Number Schedule Of Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Common stock repurchased (in shares) Treasury Stock, Shares, Acquired Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Operating Segments Operating Segments [Member] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Common Stock, Held in Treasury Treasury Stock, Common [Member] Schedule of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Intersegment sales Intersegment Eliminations [Member] Litigation Plaintiffs [Axis] Litigation Plaintiffs [Axis] Litigation Plaintiffs Damages awarded Loss Contingency, Damages Awarded, Value Equity Components [Axis] Equity Components [Axis] Award Timing Method Award Timing Method [Text Block] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Restructuring Type [Axis] Restructuring Type [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Insider Trading Policies and Procedures [Line Items] Depreciation and amortization Investments in and Advances to Affiliates, at Fair Value, Gross Reductions Adjustment to Compensation, Amount Adjustment to Compensation Amount Additional paid-in capital Additional Paid in Capital, Common Stock Compensation Amount Outstanding Recovery Compensation Amount Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Entity Small Business Entity Small Business Accounts Payable Accounts Payable and Accrued Liabilities Disclosure [Text Block] Company Selected Measure Amount Company Selected Measure Amount Tabular List, Table Tabular List [Table Text Block] 5.0% Senior Notes Due 2046 Five Percent Senior Notes Due Twenty Forty-Six [Member] Five Percent Senior Notes Due Twenty Forty-Six [Member] Accounts receivable, net Accounts receivable, net Receivables, Net, Current Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Petro 2 Flash Fire And EDC Storage Tank Explosion Petro 2 Flash Fire And EDC Storage Tank Explosion [Member] Petro 2 Flash Fire And EDC Storage Tank Explosion Environmental loss contingency accrual Loss Contingency Accrual Accrued and other liabilities Accrued Liabilities, Current Number of options excluded from computation of diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Credit Facility [Domain] Credit Facility [Domain] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Current assets Assets, Current [Abstract] Goodwill Beginning Balance Ending Balance Goodwill Cost of Implementation Cost of Implementation [Member] Cost of Implementation Consolidation Items [Axis] Consolidation Items [Axis] Inventories Inventory Disclosure [Text Block] Treasury Stock, Common, Shares Beginning balance, treasury stock (in shares) Ending balance, treasury stock (in shares) Treasury Stock, Common, Shares Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Goodwill [Roll Forward] Goodwill [Roll Forward] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Other, net Proceeds from (Payments for) Other Financing Activities Comprehensive income attributable to Westlake Corporation Comprehensive Income (Loss), Net of Tax, Attributable to Parent Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Credit Agreement Credit Agreement [Member] Credit Agreement [Member] Security Exchange Name Security Exchange Name Spread on variable rate Debt Instrument, Basis Spread on Variable Rate Award Type Award Type [Axis] Effects of changes in foreign exchange rates Goodwill, Foreign Currency Translation Gain (Loss) Accrued rebates Accrued Rebates, Current Accrued Rebates, Current Property, plant and equipment, net Property, Plant and Equipment, Net Settled Litigation Settled Litigation [Member] Total liabilities Liabilities Noncontrolling interests Equity, Attributable to Noncontrolling Interest Common stock, par value, in dollars per share Common Stock, Par or Stated Value Per Share Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Revolving Credit Facility Revolving Credit Facility [Member] Expiration Date Trading Arrangement Expiration Date Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Operating lease liabilities, current Operating Lease, Liability, Current Equity Method Investments Activity [Roll Forward] Equity Method Investments Activity [Roll Forward] Equity Method Investments Activity Total Shareholder Return Amount Total Shareholder Return Amount Common Stock, Shares, Issued Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Issued Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity 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] Accrued Liabilities and Other Liabilities [Abstract] Accrued Liabilities and Other Liabilities [Abstract] Indirect Purchasers Indirect Purchasers [Member] Indirect Purchasers Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Groundwater Monitoring Groundwater Monitoring [Member] Groundwater Monitoring Reconciliation of Assets from Segment to Consolidated [Table] Reconciliation of Assets from Segment to Consolidated [Table] Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Infrastructure Products Infrastructure Products [Member] Infrastructure Products Environmental exit costs, reasonably possible additional loss Environmental Exit Costs, Reasonably Possible Additional Loss Common stock, shares authorized Common Stock, Shares Authorized Earnings and Dividends per Share Earnings and Dividends Per Share [Text Block] Earnings and Dividends Per Share [Text Block] Basis of Financial Statements Basis of Accounting, Policy [Policy Text Block] Diluted (in shares) Weighted average common shares—diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Other comprehensive income (loss), net of income taxes Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Total Westlake Corporation stockholders' equity Equity, Attributable to Parent Schedule of Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Common stock, held in treasury, at cost; 5,952,302 and 6,439,289 shares at September 30, 2024 and December 31, 2023, respectively Treasury Stock, Value Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Axis] Related Party Related Party [Member] Financial Instruments Financial Instruments Disclosure [Text Block] Segment Reporting, Asset Reconciling Item [Line Items] Segment Reporting, Asset Reconciling Item [Line Items] Litigation Case [Axis] Litigation Case [Axis] Materials and supplies Inventory, Supplies, Net of Reserves Interest expense Interest Expense, Nonoperating Operating lease information: Lessee, Operating Lease, Description [Abstract] Deferred income taxes Deferred Income Tax Expense (Benefit) Schedule of Goodwill Schedule of Goodwill [Table Text Block] Selling, general and administrative expenses Selling, General and Administrative Expense Partners' capital, sold in public offering (in shares) Partners' Capital Account, Units, Sold in Public Offering Net other comprehensive income (loss) attributable to Westlake Corporation Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Accounts receivable from trade customers, net Accounts Receivable, after Allowance for Credit Loss, Current Long-term debt, carrying value Carrying Value Long-Term Debt Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Trade customers Accounts Receivable, before Allowance for Credit Loss, Current Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] ASSETS Assets [Abstract] Ethylene Antitrust Litigation Proceedings Ethylene Antitrust Litigation Proceedings [Member] Ethylene Antitrust Litigation Proceedings Other comprehensive income (loss), net of income taxes Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Document Type Document Type Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Income tax provision on pension and other post-retirement benefits liability Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Nonrelated Party Nonrelated Party [Member] Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Maximum Maximum [Member] Amortization of intangibles Amortization of Intangible Assets Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Customer relationships, net Finite-Lived Intangible Assets, Net Accounts payable Accounts payable Accounts Payable, Current Westlake Chemical OpCo LP Westlake Chemical OpCo LP [Member] Westlake Chemical OpCo LP [Member] Term Loan Due 2026 Term Loan Due Twenty Twenty Six [Member] Term Loan Due Twenty Twenty Six Current Fiscal Year End Date Current Fiscal Year End Date Statistical Measurement [Axis] Statistical Measurement [Axis] PEO Name PEO Name Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount All Award Types Award Type [Domain] Westlake Chemical Partners LP Westlake Chemical Partners LP [Member] Westlake Chemical Partners LP [Member] Name Outstanding Recovery, Individual Name Shares issued—stock- based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Accounts Payable [Abstract] Accounts Payable [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] 3.125% Senior Notes Due 2051 Three Point One Two Five Percent Senior Notes Due Twenty Fifty One [Member] Three Point One Two Five Percent Senior Notes Due Twenty Fifty One 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] Pension and other post-retirement benefits Liability, Defined Benefit Plan, Noncurrent Non-PEO NEO Non-PEO NEO [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Award Timing Predetermined Award Timing Predetermined [Flag] Goodwill Goodwill Disclosure [Text Block] Dividends paid Payments of Ordinary Dividends, Common Stock Investment, Name [Axis] Investment, Name [Axis] Recently Issued Accounting Pronouncements and Recently Adopted Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Diluted (in dollars per share) Earnings Per Share, Diluted Class of Stock [Axis] Class of Stock [Axis] Other, net of income tax Other Comprehensive Income, Other, Net of Tax Counterparty Name [Domain] Counterparty Name [Domain] Reconciliation Of Denominator For Basic And Diluted Earnings Per Share Schedule of Weighted Average Number of Shares [Table Text Block] Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Type of Restructuring [Domain] Type of Restructuring [Domain] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Legal fee and procedural fine percent Litigation Settlement, Legal Fee and Procedural Fine Percentage Litigation Settlement, Legal Fee and Procedural Fine Percentage Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest Ownership [Axis] Ownership [Axis] 1.625% Senior Notes Due 2029 One Point Six Two Five Percentage Senior Notes Due Twenty Twenty Nine [Member] One Point Six Two Five Percentage Senior Notes Due Twenty Twenty Nine Number of segments Number of Operating Segments Pending Litigation Pending Litigation [Member] Percentage of principal amount redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Employee Severance Employee Severance [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Investment, Beginning Balance Investment, Ending Balance Investment Owned, Fair Value Pension and Other Post-Retirement Benefits Liability, Net of Tax Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Provision for income taxes Provision for (benefit from) income taxes Income Tax Expense (Benefit) Other income (expense) Nonoperating Income (Expense) [Abstract] Stated interest rate (percent) Debt Instrument, Interest Rate, Stated Percentage Corporate and other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Cash paid for: Supplemental Cash Flow Information [Abstract] Other income, net Other income, net Nonoperating Income (Expense) Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Pension and other post-retirement benefits liability Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [Abstract] Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Income from operations Income (loss) from operations Income from operations Operating Income (Loss) Variable Rate [Domain] Variable Rate [Domain] Total liabilities and equity Liabilities and Equity Other losses (gains), net Other Operating Activities, Cash Flow Statement Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] All Adjustments to Compensation All Adjustments to Compensation [Member] Changes in Investment Equity Method Investments [Table Text Block] Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Other intangible assets, net Other Intangible Assets, Net Restructuring, transaction and integration-related costs Restructuring Charges Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Environmental Remediation And Other Plant Mothballing Costs Environmental Remediation And Other Plant Mothballing Costs [Member] Environmental Remediation And Other Plant Mothballing Costs Right-of-use assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Underlying Security Market Price Change Underlying Security Market Price Change, Percent Individual: Individual [Axis] Subsidiary of Common Parent Subsidiary of Common Parent [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Inventories Inventories Inventory, Net EPA Environmental Protection Agency [Member] Environmental Protection Agency [Member] Cash contributions Investments in and Advances to Affiliates, at Fair Value, Gross Additions Product and Service [Axis] Product and Service [Axis] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Entity Address, State or Province Entity Address, State or Province Statement [Line Items] Statement [Line Items] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Triad Hunter Proceedings Triad Hunter Proceedings [Member] Triad Hunter Proceedings Accounts payable Accounts Payable, Trade, Current Reconciliation Of Total Segment Income From Operations To Consolidated Income Before Income Taxes Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Accounts receivable Increase (Decrease) in Accounts and Other Receivables Unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Minimum Minimum [Member] Restatement Determination Date Restatement Determination Date Unamortized debt issuance cost Unamortized Debt Issuance Expense Adoption Date Trading Arrangement Adoption Date Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Swingline Loan Swingline Loan [Member] Swingline Loan [Member] Income tax (provision) benefit on foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Segments [Axis] Segments [Axis] 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] U.S. federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Total long-term debt, principal amount Long-Term Debt, Gross Exercise Price Award Exercise Price Supplemental Information Additional Financial Information Disclosure [Text Block] Arrangement Duration Trading Arrangement Duration Pension and other post-retirement benefits reserves adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Housing and Infrastructure Products Segment Housing and Infrastructure Products [Member] Housing and Infrastructure Products Stockholders' equity Equity, Attributable to Parent [Abstract] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Segments [Domain] Segments [Domain] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Essential Materials Essential Materials [Member] Essential Materials All Individuals All Individuals [Member] PEO PEO [Member] Variable Rate [Axis] Variable Rate [Axis] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Name Trading Arrangement, Individual Name Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Litigation interest rate Litigation Settlement, Interest Rate Litigation Settlement, Interest Rate Receivables [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 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] Related Party [Domain] Related and Nonrelated Parties [Domain] LACC, LLC LACC, LLC [Member] LACC, LLC [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Deferred income taxes Deferred Income Tax Liabilities, Net Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Changes in operating assets and liabilities, net of effect of business acquisitions Increase (Decrease) in Operating Capital [Abstract] Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Additions to investments in unconsolidated subsidiaries Return of (additions to) investment from unconsolidated subsidiaries Return of (additions to) investment from unconsolidated subsidiaries PEO Total Compensation Amount PEO Total Compensation Amount Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Common Stock Common Stock [Member] Measure: Measure [Axis] Litigation Plaintiffs [Domain] Litigation Plaintiffs [Domain] Litigation Plaintiffs [Domain] Partners' Capital [Abstract] Partners' Capital [Abstract] Shares issued—stock-based compensation Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Preferred stock, shares authorized Preferred Stock, Shares Authorized Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Line of Credit Line of Credit [Member] Entity Emerging Growth Company Entity Emerging Growth Company Segment Reporting [Abstract] Segment Reporting [Abstract] Entity Central Index Key Entity Central Index Key Damages sought Loss Contingency, Damages Sought, Value Schedule Of Inventory Schedule of Inventory, Current [Table Text Block] Avient Avient [Member] Avient [Member] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Cumulative Foreign Currency Exchange, Net of Tax Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Schedule of Accounts Payable Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Partner Type of Partners' Capital Account, Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Preferred stock, par value, in dollars per share Preferred Stock, Par or Stated Value Per Share Equity Component [Domain] Equity Component [Domain] Segment Information Segment Reporting Disclosure [Text Block] Current portion of long-term debt, net Current portion Long-Term Debt, Current Maturities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] 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 Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Foreign currency translation adjustments Foreign Currency Translation Adjustment, by Component [Abstract] Title Trading Arrangement, Individual Title Performance and Essential Materials Segment Performance and Essential Materials [Member] Performance and Essential Materials Statement [Table] Statement [Table] Environmental exit costs, anticipated cost Environmental Exit Costs, Anticipated Cost Counterparty Name [Axis] Counterparty Name [Axis] 2.875% Senior Notes Due 2041 2.875% Senior Notes Due 2041 [Member] 2.875% Senior Notes Due 2041 Schedule Of Net Income Attributable To Common Stockholders Schedule Of Net Income Loss Attributable To Common Stockholders [Table Text Block] Schedule of net income (loss) attributable to common stockholders [Table Text Block] Comprehensive income attributable to noncontrolling interests, net of tax of $0 and $1 for the three months ended September 30, 2024 and 2023; and net of tax of $2 and $3 for the nine months ended September 30, 2024 and 2023, respectively Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Consolidation Items [Domain] Consolidation Items [Domain] Loan related to tax-exempt waste disposal revenue bonds due 2027 Waste Disposal Revenue Bonds Due Twenty Twenty Seven [Member] Waste Disposal Revenue Bonds Due Twenty Twenty-Seven [Member] City Area Code City Area Code Current liabilities Liabilities, Current [Abstract] Debt Instrument Redemption [Table] Debt Instrument Redemption [Table] Interest, net of interest capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total current assets Assets, Current Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Senior Notes Senior Notes [Member] Noncash Investing and Financing Items [Abstract] Noncash Investing and Financing Items [Abstract] Limited Partner Limited Partner [Member] Accrued and other liabilities Increase (Decrease) in Accrued Liabilities Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Repurchase of common stock for treasury Payments for Repurchase of Common Stock Document Information [Line Items] Document Information [Line Items] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Long-term debt, net Long-term debt, carrying value, net of current portion Long-Term Debt, Excluding Current Maturities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Site contingency, percentage of cost potentially of other responsible parties Site Contingency, Percentage of Cost Potentially of Other Responsible Parties Site Contingency, Percentage of Cost Potentially of Other Responsible Parties Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Income Taxes Income Tax Disclosure [Text Block] Earnings per common share attributable to Westlake Corporation: Earnings Per Share [Abstract] Equity [Abstract] Equity [Abstract] 0.875% Senior Notes Due 2024 Zero Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Four [Member] Zero Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Four Retained earnings Retained Earnings (Accumulated Deficit) Class of Stock [Domain] Class of Stock [Domain] Accounts and Notes Payable [Line Items] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Inventories Increase (Decrease) in Inventories Litigation settlement, amount awarded to other party Litigation Settlement, Amount Awarded to Other Party Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Net cash used for financing activities Net Cash Provided by (Used in) Financing Activities Underlying Securities Award Underlying Securities Amount Credit Facility [Axis] Credit Facility [Axis] Interest income, other Interest Income, Other Notes payable Notes and Loans Payable, Current Dividends declared Dividends, Common Stock, Cash Amendment Flag Amendment Flag Fair Value Long-Term Debt, Fair Value Entity Registrant Name Entity Registrant Name Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Depreciation and amortization Depreciation, Depletion and Amortization Gross profit Gross Profit Fair Value as of Grant Date Award Grant Date Fair Value Total Assets Reconciliation of Assets from Segment to Consolidated [Table Text Block] 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 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 September 30, 2024 and December 31, 2023, 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 Debt Instrument, Redemption [Line Items] Debt Instrument, Redemption [Line Items] 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 Debt Instrument [Axis] Debt Instrument [Axis] Partner Type [Axis] Partner Type [Axis] Net income 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] 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 Insurance recoveries Insurance Recoveries 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 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 Regulatory Agency [Axis] Regulatory Agency [Axis] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Litigation Case [Domain] Litigation Case [Domain] Accumulated other comprehensive loss Beginning balance Ending balance 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 Regulatory Agency [Domain] Regulatory Agency [Domain] 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 Environmental Loss Contingencies [Line Items] Loss Contingencies [Line Items] Letter of Credit Letter of Credit [Member] Company Selected Measure Name Company Selected Measure Name