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	8		8
Pension and OPEB liability adjustment	(4)				(4)
Foreign currency translation adjustment	(2)				(2)
Interest rate swaps	12				12
Repurchase of common stock	(226)			(226)
Dividends on common stock	(42)			(42)
Net income	230			230
Balance at Jun. 30, 2021	732	1	1,826	(1,012)	(83)
Balance at Mar. 31, 2021	764	1	1,820	(971)	(86)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5		5
Pension and OPEB liability adjustment	(2)				(2)
Foreign currency translation adjustment	4				4
Interest rate swaps	1				1
Issuance of common stock	1		1
Repurchase of common stock	(130)			(130)
Dividends on common stock	(21)			(21)
Net income	110			110
Balance at Jun. 30, 2021	732	1	1,826	(1,012)	(83)
Balance at Dec. 31, 2021	634	1	1,832	(1,126)	(73)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	9		9
Pension and OPEB liability adjustment	(4)				(4)
Foreign currency translation adjustment	(8)				(8)
Interest rate swaps	25				25
Issuance of common stock	(2)		(2)
Repurchase of common stock	(115)			(115)
Dividends on common stock	(41)			(41)
Net income	251			251
Balance at Jun. 30, 2022	749	1	1,839	(1,031)	(60)
Balance at Mar. 31, 2022	679	1	1,832	(1,098)	(56)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	6		6
Pension and OPEB liability adjustment	(2)				(2)
Foreign currency translation adjustment	(8)				(8)
Interest rate swaps	6				6
Issuance of common stock	1		1
Repurchase of common stock	(34)			(34)
Dividends on common stock	(21)			(21)
Net income	122			122
Balance at Jun. 30, 2022	$ 749	$ 1	$ 1,839	$ (1,031)	$ (60)