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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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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 Tax |  | Cumulative Foreign Currency Exchange, Net of Tax |  | Other, Net of Tax |  | Total
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 |  | 1 |  |  | (81) |  |  | — |  |  | (80) |
Balances at June 30, 2022 |  | $ | 21 |  |  | $ | (137) |  |  | $ | — |  |  | $ | (116) |

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