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Stockholders' Equity - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2013
Class of Stock [Line Items]
Decrease in stockholders' equity			$ 128,000,000
Net (loss) income	$ (230,000,000)	$ 33,000,000	(153,000,000)	$ 57,000,000
Employee stock transactions			$ 24,000,000
Number of warrants issued (in shares)					13,490,236
Warrant, strike price per share (usd per share)					$ 53.8475
Stated percentage of warrants	1.125%		1.125%
Employee stock compensation expense			$ 35,000,000	16,000,000
Accelerated compensation expense			23,000,000
Unrecognized compensation expense	$ 32,000,000		$ 32,000,000
Unrecognized compensation forfeiture rate			3.30%
Restricted Stock Awards
Class of Stock [Line Items]
Total fair value of awards granted			$ 19,000,000	17,000,000
Total fair value of awards vested			$ 20,000,000	21,000,000
Accelerated vesting of awards (in shares)			133,957
Weighted average period for recognition			2 years 6 months
Performance Stock Awards
Class of Stock [Line Items]
Total fair value of awards granted			$ 0	15,000,000
Total fair value of awards vested			$ 15,000,000	0
Accelerated vesting of awards (in shares)			153,574
Performance Stock Units
Class of Stock [Line Items]
Total fair value of awards granted			$ 16,000,000	0
Total fair value of awards vested			$ 9,000,000	$ 0
Accelerated vesting of awards (in shares)			139,272
Weighted average period for recognition			2 years 1 month
Common Stock
Class of Stock [Line Items]
Number of common stock issued (in shares)			692,000

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