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Accumulated Other Comprehensive Income (Loss) (Tables)
6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component for the six months ended June 30, 2023 and 2022 were as follows:
Pension and Other Post-Retirement Benefits Liability, Net of TaxCumulative Foreign Currency
Exchange, Net of Tax
Other, Net of TaxTotal
Balances at December 31, 2022$52 $(141)$— $(89)
Net other comprehensive income (loss) attributable to Westlake Corporation(13)24 (1)10 
Balances at June 30, 2023$39 $(117)$(1)$(79)
Balances at December 31, 2021$20 $(56)$— $(36)
Net other comprehensive income (loss) attributable to Westlake Corporation(81)— (80)
Balances at June 30, 2022$21 $(137)$— $(116)