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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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