Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss) by component for the nine months ended September 30, 2021 and 2020 were as follows:

	Pension and Other Post-Retirement Benefits Liability, Net of Tax		Cumulative Foreign Currency Exchange, Net of Tax		Total
Balances at December 31, 2020	$	(24)	$	(40)	$	(64)
Other comprehensive loss attributable to Westlake Chemical Corporation	—		(11)		(11)
Balances at September 30, 2021	$	(24)	$	(51)	$	(75)
Balances at December 31, 2019	$	3	$	(77)	$	(74)
Other comprehensive income attributable to Westlake Chemical Corporation	—		5		5
Balances at September 30, 2020	$	3	$	(72)	$	(69)