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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component were as follows:
Pension and Other Post-Retirement Benefits Liability, Net of TaxCumulative Foreign Currency
Exchange, Net of Tax		Total
Balances at December 31, 2020$(24)$(40)$(64)
Net other comprehensive income (loss) attributable to Westlake Corporation44 (16)28 
Balances at December 31, 202120 (56)(36)
Net other comprehensive income (loss) attributable to Westlake Corporation32 (85)(53)
Balances at December 31, 2022$52 $(141)$(89)