Accumulated Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss) by component for the three months ended March 31, 2024 and 2023 were as follows:

	Pension and Other Post-Retirement Benefits Liability, Net of Tax		Cumulative Foreign Currency Exchange, Net of Tax		Other, Net of Tax		Total
Balances at December 31, 2023	$	4	$	(102)	$	—	$	(98)
Net other comprehensive income (loss) attributable to Westlake Corporation	1		(35)		—		(34)
Balances at March 31, 2024	$	5	$	(137)	$	—	$	(132)
Balances at December 31, 2022	$	52	$	(141)	$	—	$	(89)
Net other comprehensive income (loss) attributable to Westlake Corporation	—		23		(1)		22
Balances at March 31, 2023	$	52	$	(118)	$	(1)	$	(67)