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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
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 profit283 169 248 323 
Income from operations136 36 79 178 
Net income157 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 income82 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 

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(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.