Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in- Capital	Retained Earnings	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2018		59,500,000
Beginning Balance at Dec. 31, 2018	$ 1,297	$ 1	$ 974	$ 319	$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment from the adoption of new accounting standard	1			1
Net loss	(27)			(27)
Dividends on common stock	(12)			(12)
Equity-based compensation (in shares)		400,000
Dividends on common stock ($0.20 per share)	2		2
Purchase of common stock ( in shares)		(700,000)
Purchase of common stock	(9)		(9)
Ending Balance at Mar. 31, 2019	1,252	$ 1	967	281	3
Ending Balance (in shares) at Mar. 31, 2019		59,200,000
Beginning Balance (in shares) at Dec. 31, 2018		59,500,000
Beginning Balance at Dec. 31, 2018	$ 1,297	$ 1	974	319	3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Purchase of common stock ( in shares)	(2,600,000)
Ending Balance at Dec. 31, 2019	$ 1,037	$ 1	954	80	2
Ending Balance (in shares) at Dec. 31, 2019	57,200,000	57,200,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (21)			(21)
Dividends on common stock	(11)			(11)
Equity-based compensation (in shares)		900,000
Dividends on common stock ($0.20 per share)	$ 2		2
Purchase of common stock ( in shares)	0
Ending Balance at Mar. 31, 2020	$ 1,007	$ 1	$ 956	$ 48	$ 2
Ending Balance (in shares) at Mar. 31, 2020	58,100,000	58,100,000