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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of 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 Tax |  | Cumulative Foreign Currency Exchange, Net of Tax |  | Total
Balances at December 31, 2018 |  | $ | 27 |  |  | $ | (89) |  |  | $ | (62) |
Net other comprehensive income (loss) attributable to Westlake Chemical Corporation |  | (24) |  |  | 12 |  |  | (12) |
Balances at December 31, 2019 |  | 3 |  |  | (77) |  |  | (74) |
Net other comprehensive income (loss) attributable to Westlake Chemical Corporation |  | (27) |  |  | 37 |  |  | 10 |
Balances at December 31, 2020 |  | $ | (24) |  |  | $ | (40) |  |  | $ | (64) |
In 2018, the Company reclassified certain income tax effects to retained earnings upon adoption of ASU No. 2018-02. See Note 1 (Income taxes) for additional information.
Reclassification out of Accumulated Other Comprehensive Income | The following table provides the details of the amounts reclassified from accumulated other comprehensive income (loss) into net income in the consolidated statements of operations:
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Location of Reclassification (Income (Expense)) in Consolidated Statements of Operations |  | Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Pension settlement gain |  | (1) |  | — |  |  | — |  |  | 14 |
Income tax benefit (provision) on pension and other post-retirement benefits |  | Provision for (benefit from) income taxes |  | — |  |  | — |  |  | (3) |
Total reclassifications for the period |  |  |  | $ | — |  |  | $ | — |  |  | $ | 11 |
______________________________ (1)The accumulated other comprehensive income (loss) component is included in the computation of net periodic benefit cost and reflected in other income, net in the consolidated statements of operations. See Note 14 for additional information on the pension settlement gain recognized in 2018.

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