Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 2,297	$ 2,070	$ 373
Pension and other post-retirement benefits
Pension and other post-retirement benefits reserves adjustment	29	60	(37)
Income tax benefit (provision) on pension and other post-retirement benefits	3	(16)	10
Foreign currency translation adjustments
Foreign currency translation	(78)	2	23
Income tax benefit (provision) on foreign currency translation	(12)	(17)	18
Other comprehensive income (loss), net of income taxes	(58)	29	14
Comprehensive income	2,239	2,099	387
Comprehensive income attributable to noncontrolling interests, net of tax of $3, $2 and $1 for 2022, 2021 and 2020, respectively	45	56	47
Comprehensive income attributable to Westlake Corporation	$ 2,194	$ 2,043	$ 340