Accumulated Other Comprehensive Income (Loss) (Notes)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

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)