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Accumulated Other Comprehensive Income (Loss)
 12 Months Ended
Dec. 31, 2021
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, 2019$3 $(77)$(74)
Net other comprehensive income (loss) attributable to Westlake Corporation(27)37 10 
Balances at December 31, 2020(24)(40)(64)
Net other comprehensive income (loss) attributable to Westlake Corporation44 (16)28 
Balances at December 31, 2021$20 $(56)$(36)