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, 2015		$ 3,167		$ 0	$ (1)	$ 9,594	$ (6,305)	$ (179)	$ 58
Treasury stock transactions		(6)		0	(6)	0	0	0	0
Stock-based compensation expense		30		0	0	30	0	0	0
Option exercises		1		0	0	1	0	0	0
Dividends	[1]	0
Distribution to the noncontrolling interest		(9)		0	0	0	0	0	(9)
Net income (loss)		111		0	0	0	92	0	19
Other comprehensive income (loss)		45		0	0	0	0	42	3
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
Option exercises		0
Dividends	[1]	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
Option exercises		0
Effects of the Merger		(78)		0	22	(100)	0	0	0
Dividends		(20)	[1]	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

[1] Subsequent to the consummation of the Merger on March 8, 2018, we paid certain Merger-related costs incurred by CPN Management, our direct parent.