Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2014	$ 1,966		$ 1,952	$ 58	$ (45)
Beginning balance, shares at Dec. 31, 2014		107,067,000
Beginning balance, Common stock value at Dec. 31, 2014		$ 1
Net loss	(502)			(502)
Adjustment to income tax from spin-off	3		3
Stock-based compensation	27		27
Exercise of stock options, shares		15,000
Vesting of restricted stock, shares		200,000
Shares withheld for taxes	(2)		(2)
Shares withheld for taxes, shares		(63,000)
Other comprehensive income (loss)	(89)				(89)
Ending balance at Dec. 31, 2015	1,403		1,980	(444)	(134)
Ending balance, shares at Dec. 31, 2015		107,219,000
Ending balance, Common stock value at Dec. 31, 2015		$ 1
Net loss	(234)			(234)
Stock-based compensation	23		23
Exercise of stock options, shares		20,000
Vesting of restricted stock, shares		341,000
Shares withheld for taxes	(1)		(1)
Shares withheld for taxes, shares		(105,000)
Other comprehensive income (loss)	(8)				(8)
Ending balance at Dec. 31, 2016	1,183		2,002	(678)	(142)
Ending balance, shares at Dec. 31, 2016		107,475,000
Ending balance, Common stock value at Dec. 31, 2016	1	$ 1
Net loss	(52)			(52)
Stock-based compensation	20		20
Exercise of stock options	$ 1		1
Exercise of stock options, shares	36,000	35,000
Vesting of restricted stock, shares		771,000
Shares withheld for taxes	$ (4)		(4)
Shares withheld for taxes, shares		(251,000)
Other comprehensive income (loss)	37				37
Ending balance at Dec. 31, 2017	1,185		$ 2,019	$ (730)	$ (105)
Ending balance, shares at Dec. 31, 2017		108,030,000
Ending balance, Common stock value at Dec. 31, 2017	$ 1	$ 1