Consolidated Statements Of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Net sales	$ 12,548	$ 15,794	$ 11,778
Cost of sales	10,329	11,721	8,283
Gross profit	2,219	4,073	3,495
Selling, general and administrative expenses	865	835	551
Impairment of goodwill and long-lived assets	475	0	0
Amortization of intangibles	122	155	123
Restructuring, transaction and integration-related costs	28	33	21
Income from operations	729	3,050	2,800
Other income (expense)
Interest expense	(165)	(177)	(176)
Other income, net	136	73	53
Income before income taxes	700	2,946	2,677
Provision for income taxes	178	649	607
Net income	522	2,297	2,070
Net income attributable to noncontrolling interests	43	50	55
Net income attributable to Westlake Corporation	$ 479	$ 2,247	$ 2,015
Earnings per common share attributable to Westlake Corporation:
Basic (in dollars per share)	$ 3.73	$ 17.46	$ 15.66
Diluted (in dollars per share)	$ 3.70	$ 17.34	$ 15.58
Weighted average common shares outstanding:
Basic (in shares)	127,806,317	127,970,445	128,002,911
Diluted (in shares)	128,598,441	128,845,562	128,697,982