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Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2024
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2024 and 2023 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, 2023$4 $(102)$— $(98)
Net other comprehensive income (loss) attributable to Westlake Corporation
1 (35)— (34)
Balances at March 31, 2024$5 $(137)$— $(132)
Balances at December 31, 2022$52 $(141)$— $(89)
Net other comprehensive income (loss) attributable to Westlake Corporation— 23 (1)22 
Balances at March 31, 2023$52 $(118)$(1)$(67)