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Quarterly Financial Information (Unaudited) (Summary Of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 1,965 $ 1,898 $ 1,709 $ 1,932 $ 1,883 $ 2,066 $ 2,144 $ 2,025 $ 7,504 $ 8,118 $ 8,635
Gross profit 323 248 169 283 250 371 340 299 1,023 1,260 1,987
Income from operations 178 79 36 136 102 226 194 134 429 656 1,408
Net income 123 69 24 157 85 166 129 82 373 462 1,034
Net income attributable to Westlake Chemical Corporation $ 113 $ 57 $ 15 $ 145 $ 72 $ 158 $ 119 $ 72 $ 330 $ 421 $ 996
Basic (in dollars per share) $ 0.87 $ 0.45 $ 0.11 $ 1.13 $ 0.56 $ 1.22 $ 0.92 $ 0.56 $ 2.57 $ 3.26 $ 7.66
Diluted (in dollars per share) $ 0.87 $ 0.45 $ 0.11 $ 1.13 $ 0.56 $ 1.22 $ 0.92 $ 0.55 $ 2.56 $ 3.25 $ 7.62