Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock Voting Common Stock	Paid-in Capital	Accumulated (Deficit) Income	Accumulated Other Comprehensive (Loss) Income, net of tax
Balance at Dec. 31, 2020	$ 756	$ 1	$ 1,818	$ (974)	$ (89)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	3		3
Pension and OPEB liability adjustment	(2)				(2)
Foreign currency translation adjustment	(6)				(6)
Interest rate swaps	11				11
Issuance of common stock	(1)		(1)
Repurchase of common stock	(96)			(96)
Dividends on common stock	(21)			(21)
Net income	120			120
Balance at Mar. 31, 2021	764	1	1,820	(971)	(86)
Balance at Dec. 31, 2021	634	1	1,832	(1,126)	(73)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	3		3
Pension and OPEB liability adjustment	(2)				(2)
Interest rate swaps	19				19
Issuance of common stock	(3)		(3)
Repurchase of common stock	(81)			(81)
Dividends on common stock	(20)			(20)
Net income	129			129
Balance at Mar. 31, 2022	$ 679	$ 1	$ 1,832	$ (1,098)	$ (56)