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Consolidated Statements Of Operations - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Net sales $ 7,504 $ 8,118 $ 8,635
Cost of sales 6,481 6,858 6,648
Gross profit 1,023 1,260 1,987
Selling, general and administrative expenses 449 458 445
Amortization of intangibles 109 109 101
Restructuring Transaction and Integration Cost 36 37 33
Income from operations 429 656 1,408
Other income (expense)      
Interest expense (142) (124) (126)
Other income, net 44 38 52
Income before income taxes 331 570 1,334
Provision for (benefit from) income taxes (42) 108 300
Net income 373 462 1,034
Net income attributable to noncontrolling interests 43 41 38
Net income attributable to Westlake Chemical Corporation $ 330 $ 421 $ 996
Earnings per common share attributable to Westlake Chemical Corporation:      
Basic (in dollars per share) $ 2.57 $ 3.26 $ 7.66
Diluted (in dollars per share) $ 2.56 $ 3.25 $ 7.62
Weighted average common shares outstanding:      
Basic (in shares) 127,850,592 128,395,184 129,401,823
Diluted (in shares) 128,089,058 128,757,293 129,985,753