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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2021 and 2020 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, 2020 |  | $ | (24) |  |  | $ | (40) |  |  | $ | (64) |
Net other comprehensive loss attributable to Westlake Chemical Corporation |  | — |  |  | (6) |  |  | (6) |
Balances at March 31, 2021 |  | $ | (24) |  |  | $ | (46) |  |  | $ | (70) |
Balances at December 31, 2019 |  | $ | 3 |  |  | $ | (77) |  |  | $ | (74) |
Net other comprehensive loss attributable to Westlake Chemical Corporation |  | — |  |  | (32) |  |  | (32) |
Balances at March 31, 2020 |  | $ | 3 |  |  | $ | (109) |  |  | $ | (106) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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