Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 522	$ 2,297	$ 2,070
Pension and other post-retirement benefits
Pension and other post-retirement benefits reserves adjustment	(40)	29	60
Income tax benefit (provision) on pension and other post-retirement benefits	(8)	3	(16)
Foreign currency translation adjustments
Foreign currency translation	32	(78)	2
Income tax benefit (provision) on foreign currency translation	7	(12)	(17)
Other comprehensive income (loss), net of income taxes	(9)	(58)	29
Comprehensive income	513	2,239	2,099
Comprehensive income attributable to noncontrolling interests, net of tax of $3, $3 and $2 for 2023, 2022 and 2021, respectively	43	45	56
Comprehensive income attributable to Westlake Corporation	$ 470	$ 2,194	$ 2,043