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Earnings and Dividends per Share (Tables)
 3 Months Ended
Mar. 31, 2021
Earnings and Dividends Per Share [Abstract]  
Schedule Of Net Income Attributable To Common Stockholders Diluted earnings per share include the effects of certain stock options and performance stock units.
Three Months Ended March 31,
20212020
Net income attributable to Westlake Chemical Corporation
$242 $145 
Less:
Net income attributable to participating securities(1)— 
Net income attributable to common shareholders$241 $145 
Reconciliation Of Denominator For Basic And Diluted Earnings Per Share
The following table reconciles the denominator for the basic and diluted earnings per share computations shown in the consolidated statements of operations:
Three Months Ended March 31,
20212020
Weighted average common shares—basic127,955,532 128,237,364 
Plus incremental shares from:
Assumed exercise of options and vesting of performance stock units
527,841 205,608 
Weighted average common shares—diluted128,483,373 128,442,972 
Earnings per common share attributable to Westlake Chemical Corporation:
Basic$1.88 $1.13 
Diluted$1.87 $1.13 
Dividends Per Share
Dividends per Share
Dividends per common share for the three months ended March 31, 2021 and 2020 were as follows:
Three Months Ended March 31,
20212020
Dividends per common share$0.2700 $0.2625