Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in- Capital	Retained  Earnings (Deficit)	Retained  Earnings (Deficit) Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018			59,500,000
Beginning balance at Dec. 31, 2018	$ 1,297	$ 1	$ 1	$ 974	$ 319	$ 1	$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(27)				(27)
Dividends on common stock	(12)				(12)
Equity-based compensation (in shares)			400,000
Equity-based compensation	2			2
Purchase of common stock ( in shares)			(700,000)
Purchase of common stock	(9)			(9)
Ending balance (in shares) at Mar. 31, 2019			59,200,000
Ending balance at Mar. 31, 2019	1,252		$ 1	967	281		3
Beginning balance (in shares) at Dec. 31, 2018			59,500,000
Beginning balance at Dec. 31, 2018	1,297	$ 1	$ 1	974	319	$ 1	3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (58)
Purchase of common stock ( in shares)	(2,600,000)
Ending balance (in shares) at Sep. 30, 2019			57,300,000
Ending balance at Sep. 30, 2019	$ 1,184		$ 1	953	228		2
Beginning balance (in shares) at Mar. 31, 2019			59,200,000
Beginning balance at Mar. 31, 2019	1,252		$ 1	967	281		3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(19)				(19)
Dividends on common stock	(11)				(11)
Equity-based compensation	4			4
Purchase of common stock ( in shares)			(1,500,000)
Purchase of common stock	(17)			(17)
Ending balance (in shares) at Jun. 30, 2019			57,700,000
Ending balance at Jun. 30, 2019	1,209		$ 1	954	251		3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(12)				(12)
Dividends on common stock	(11)				(11)
Equity-based compensation (in shares)			0
Equity-based compensation	3			3
Purchase of common stock ( in shares)			(400,000)
Purchase of common stock	(4)			(4)
Distributions to noncontrolling interest	(1)						(1)
Ending balance (in shares) at Sep. 30, 2019			57,300,000
Ending balance at Sep. 30, 2019	$ 1,184		$ 1	953	228		2
Beginning balance (in shares) at Dec. 31, 2019	57,200,000		57,200,000
Beginning balance at Dec. 31, 2019	$ 1,037		$ 1	954	80		2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(21)				(21)
Dividends on common stock	(11)				(11)
Equity-based compensation (in shares)			900,000
Equity-based compensation	2			2
Ending balance (in shares) at Mar. 31, 2020			58,100,000
Ending balance at Mar. 31, 2020	$ 1,007		$ 1	956	48		2
Beginning balance (in shares) at Dec. 31, 2019	57,200,000		57,200,000
Beginning balance at Dec. 31, 2019	$ 1,037		$ 1	954	80		2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (136)
Ending balance (in shares) at Sep. 30, 2020	58,200,000		58,200,000
Ending balance at Sep. 30, 2020	$ 898		$ 1	962	(67)		2
Beginning balance (in shares) at Mar. 31, 2020			58,100,000
Beginning balance at Mar. 31, 2020	1,007		$ 1	956	48		2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(107)				(107)
Equity-based compensation (in shares)			100,000
Equity-based compensation	3			3
Ending balance (in shares) at Jun. 30, 2020			58,200,000
Ending balance at Jun. 30, 2020	903		$ 1	959	(59)		2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(8)				(8)
Equity-based compensation	$ 3			3
Ending balance (in shares) at Sep. 30, 2020	58,200,000		58,200,000
Ending balance at Sep. 30, 2020	$ 898		$ 1	$ 962	$ (67)		$ 2