Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 407	$ 764
Foreign currency translation adjustments
Foreign currency translation	20	(8)
Income tax (provision) benefit on foreign currency translation	3	(3)
Other, net of income tax	(1)	0
Other comprehensive income (loss), net of income taxes	22	(11)
Comprehensive income	429	753
Comprehensive income attributable to noncontrolling interests, net of tax of $1 and $1 for the three months ended March 31, 2023 and 2022, respectively	13	6
Comprehensive income attributable to Westlake Corporation	$ 416	$ 747