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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |
Number of warrants issued (in shares) |  |  | 13,490,236
Warrant, strike price per share (in dollars per share) |  |  | $ 53.8475
Unrecognized compensation expense | $ 53 | $ 53 |
Unrecognized compensation forfeiture rate |  | 9.70% |
Stock options granted (in shares) |  | 0 |
Stock options exercised (in shares) |  | 0 |
Restricted Stock Awards |  |  |
Class of Stock [Line Items] |  |  |
Weighted average period for recognition |  | 3 years 2 months |
Performance Stock Awards |  |  |
Class of Stock [Line Items] |  |  |
Weighted average period for recognition |  | 11 months |
Performance Stock Units |  |  |
Class of Stock [Line Items] |  |  |
Weighted average period for recognition |  | 2 years 8 months |
Employee Stock Option |  |  |
Class of Stock [Line Items] |  |  |
Unrecognized compensation expense | $ 13 | $ 13 |
Weighted average period for recognition |  | 2 years 6 months |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Number of common stock issued (in shares) |  | 127,000 |
1.625% Convertible Notes | Convertible Notes |  |  |
Class of Stock [Line Items] |  |  |
Debt conversion (in shares) | 1,800,000 |  |
Cash Convertible Senior Notes Due 2020, Warrants |  |  |
Class of Stock [Line Items] |  |  |
Stated percentage of warrants | 1.125% | 1.125% |

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