Consolidated Statements of Stockholders Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2016	$ 3,339	$ 0	$ (7)	$ 9,625	$ (6,213)	$ (137)	$ 71
Treasury stock transactions	(8)	0	(8)	0	0	0	0
Stock-based compensation expense	36	0	0	36	0	0	0
Distribution to the noncontrolling interest	(12)	0	0	0	0	0	(12)
Net income (loss)	(321)	0	0	0	(339)	0	18
Other comprehensive income (loss)	33	0	0	0	0	31	2
Balance at Dec. 31, 2017	3,067	0	(15)	9,661	(6,552)	(106)	79
Treasury stock transactions	(7)	0	(7)	0	0	0	0
Stock-based compensation expense	41	0	0	41	0	0	0
Effects of the Merger	(78)	0	22	(100)	0	0	0
Dividends	(20)	0	0	(20)	0	0	0
Contribution from the noncontrolling interest	2	0	0	0	0	0	2
Distribution to the noncontrolling interest	(9)	0	0	0	0	0	(9)
Net income (loss)	28	0	0	0	10	0	18
Other comprehensive income (loss)	32	0	0	0	0	29	3
Balance at Dec. 31, 2018	3,056	0	0	9,582	(6,542)	(77)	93
Effects of the Merger	0	0	0	(2)	0	0	2
Dividends	1,151	0	0	0	1,151	0	0
Net income (loss)	790	0	0	0	770	0	20
Other comprehensive income (loss)	(37)	0	0	0	0	(37)	0
Balance at Dec. 31, 2019	$ 2,658	$ 0	$ 0	$ 9,584	$ (6,923)	$ (114)	$ 111