Condensed Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in- Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2017	$ 828	$ 1	$ (212)	$ 1,181	$ (144)	$ (1)	$ 3
Beginning Balance, shares at Dec. 31, 2017		58,700,000
Cumulative-effect adjustment from the adoption of new revenue accounting standard	(15)				(15)
Net loss	(15)				(15)
Equity-based compensation	4			4
Cash flow hedge adjustment, net of tax	3					3
Ending Balance at Mar. 31, 2018	805	$ 1	$ (212)	1,185	(174)	$ 2	3
Ending Balance, shares at Mar. 31, 2018		58,700,000
Beginning Balance at Dec. 31, 2018	$ 1,297	$ 1		974	319		3
Beginning Balance, shares at Dec. 31, 2018	59,500,000	59,500,000
Cumulative-effect adjustment from the adoption of new revenue accounting standard	$ 1				1
Net loss	(27)				(27)
Dividends on common stock ($0.20 per share)	(12)				(12)
Equity-based compensation	2			2
Equity-based compensation, shares		400,000
Purchase of common stock	(9)			(9)
Purchase of common stock, shares		(700,000)
Ending Balance at Mar. 31, 2019	$ 1,252	$ 1		$ 967	$ 281		$ 3
Ending Balance, shares at Mar. 31, 2019	59,200,000	59,200,000