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Stockholders' Equity - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2013
Class of Stock [Line Items]
Decrease in stockholders' equity			$ 220,000,000
Net (loss) income	$ (97,000,000)	$ 42,000,000	(250,000,000)	$ 99,000,000
Employee stock transactions			$ 29,000,000
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			$ 38,000,000	24,000,000
Unrecognized compensation expense	$ 27,000,000		$ 27,000,000
Unrecognized compensation forfeiture rate			4.50%
Restricted Stock Awards
Class of Stock [Line Items]
Total fair value of awards granted			$ 19,000,000	18,000,000
Total fair value of awards vested			$ 21,000,000	22,000,000
Accelerated vesting of awards (in shares)			133,957
Weighted average period for recognition			2 years 2 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			1 year 11 months
Common Stock
Class of Stock [Line Items]
Number of common stock issued (in shares)			702,000

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