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Earnings and Dividends per Share (Reconciliation of Denominator for Basic and Diluted Earnings Per Share) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings and Dividends Per Share [Abstract]
Weighted average common shares—basic	127,955,532	128,237,364
Weighted Average Number Diluted Shares Outstanding Adjustment	527,841	205,608
Weighted average common shares-diluted	128,483,373	128,442,972
Earnings per share attributable to Westlake Chemical Corporation: Basic (in dollars per share)	$ 1.88	$ 1.13
Earnings per share attributable to Westlake Chemical Corporation: Diluted (in dollars per share)	$ 1.87	$ 1.13

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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