Earnings and Dividends per Share (Schedule Of Net Income Attributable To Common Stockholders) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings and Dividends Per Share [Abstract]
Net income attributable to Westlake Corporation	$ 2,247	$ 2,015	$ 330
Net income attributable to participating securities	(12)	(10)	(1)
Net income attributable to common shareholders	$ 2,235	$ 2,005	$ 329