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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Summary Of Quarterly Financial Information |
|  | Three Months Ended
|  | March 31, 2020 |  | June 30, 2020 |  | September 30, 2020 |  | December 31, 2020
Net sales |  | $ | 1,932 |  |  | $ | 1,709 |  |  | $ | 1,898 |  |  | $ | 1,965 |
Gross profit |  | 283 |  |  | 169 |  |  | 248 |  |  | 323 |
Income from operations |  | 136 |  |  | 36 |  |  | 79 |  |  | 178 |
Net income |  | 157 |  |  | 24 |  |  | 69 |  |  | 123 |
Net income attributable to Westlake Chemical Corporation |  | 145 |  |  | 15 |  |  | 57 |  |  | 113 |
Earnings per common share attributable to Westlake Chemical Corporation: (1) |  |  |  |  |  |  |  |
Basic |  | $ | 1.13 |  |  | $ | 0.11 |  |  | $ | 0.45 |  |  | $ | 0.87 |
Diluted |  | $ | 1.13 |  |  | $ | 0.11 |  |  | $ | 0.45 |  |  | $ | 0.87 |
|  | Three Months Ended
|  | March 31, 2019 |  | June 30, 2019 |  | September 30, 2019 |  | December 31, 2019
Net sales |  | $ | 2,025 |  |  | $ | 2,144 |  |  | $ | 2,066 |  |  | $ | 1,883 |
Gross profit |  | 299 |  |  | 340 |  |  | 371 |  |  | 250 |
Income from operations |  | 134 |  |  | 194 |  |  | 226 |  |  | 102 |
Net income |  | 82 |  |  | 129 |  |  | 166 |  |  | 85 |
Net income attributable to Westlake Chemical Corporation |  | 72 |  |  | 119 |  |  | 158 |  |  | 72 |
Earnings per common share attributable to Westlake Chemical Corporation: (1) |  |  |  |  |  |  |  |
Basic |  | $ | 0.56 |  |  | $ | 0.92 |  |  | $ | 1.22 |  |  | $ | 0.56 |
Diluted |  | $ | 0.55 |  |  | $ | 0.92 |  |  | $ | 1.22 |  |  | $ | 0.56 |
______________________________ (1)Basic and diluted earnings per common share ("EPS") for each quarter is computed using the weighted average shares outstanding during that quarter, while EPS for the year is computed using the weighted average shares outstanding for the year. As a result, the sum of the EPS for each of the four quarters may not equal the EPS for the year.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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