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Accumulated Other Comprehensive Income (Loss) (Notes)
 6 Months Ended
Jun. 30, 2022
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component for the six months ended June 30, 2022 and 2021 were as follows:
Pension and Other Post-Retirement Benefits
Liability,
Net of Tax		Cumulative
Foreign
Currency
Exchange,
Net of Tax		Total
Balances at December 31, 2021$20 $(56)$(36)
Other comprehensive loss attributable to Westlake Corporation1 (81)(80)
Balances at June 30, 2022$21 $(137)$(116)
Balances at December 31, 2020$(24)$(40)$(64)
Other comprehensive income attributable to Westlake Corporation— 8 8 
Balances at June 30, 2021$(24)$(32)$(56)