CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (25)	$ (3,112)	$ 891
Change in value of pension and other postretirement liabilities:
Amortization of prior service cost and net loss, including loss on settlements and curtailments included in net periodic pension cost	[1]	2	3	8
Net actuarial loss incurred in period		11	(8)	(5)
Total change in value of pension and postretirement liabilities		13	(5)	3
Comprehensive income (loss)		$ (12)	$ (3,117)	$ 894

[1] $0.4 million and $2 million in tax effects for the years ended December 31, 2021 and 2019, respectively, which were netted against a valuation allowance and therefore included in accumulated other comprehensive income. The year ended December 31, 2020 is presented net of $1 million in taxes.