Consolidated Statements Of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Net sales	$ 15,794	$ 11,778	$ 7,504
Cost of sales	11,721	8,283	6,481
Gross profit	4,073	3,495	1,023
Selling, general and administrative expenses	835	551	449
Amortization of intangibles	155	123	109
Restructuring, transaction and integration-related costs	33	21	36
Income from operations	3,050	2,800	429
Other income (expense)
Interest expense	(177)	(176)	(142)
Other income, net	73	53	44
Income before income taxes	2,946	2,677	331
Provision for (benefit from) income taxes	649	607	(42)
Net income	2,297	2,070	373
Net income attributable to noncontrolling interests	50	55	43
Net income attributable to Westlake Corporation	$ 2,247	$ 2,015	$ 330
Earnings per common share attributable to Westlake Corporation:
Basic (in dollars per share)	$ 17.46	$ 15.66	$ 2.57
Diluted (in dollars per share)	$ 17.34	$ 15.58	$ 2.56
Weighted average common shares outstanding:
Basic (in shares)	127,970,445	128,002,911	127,850,592
Diluted (in shares)	128,845,562	128,697,982	128,089,058