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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | 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
Cash paid for partial termination of 1.125% Warrants |  |  |  |  | $ 419 | $ 0 |
Share-based compensation |  | $ 7 |  | $ 3 | 20 | 38 |
Unrecognized compensation expense |  | 41 |  |  | $ 41 |  |
Unrecognized compensation forfeiture rate |  |  |  |  | 12.10% |  |
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 |  |  |  |  | 2 years 10 months |  |
Performance Stock Awards |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Weighted average period for recognition |  |  |  |  | 5 months |  |
Performance Stock Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Weighted average period for recognition |  |  |  |  | 2 years 4 months |  |
Employee Stock Option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense |  | $ 11 |  |  | $ 11 |  |
Weighted average period for recognition |  |  |  |  | 2 years |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Number of common stock issued (in shares) |  |  |  |  | 281,000 |  |
1.625% Notes (2) | Convertible Notes |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt conversion (in shares) | 1,800,000 | 600,000 |  |  |  |  |
Cash Convertible Senior Notes Due 2020, Warrants |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stated percentage of warrants |  | 1.125% |  |  | 1.125% |  |
Warrants outstanding (in shares) |  | 7,700,000 |  |  | 7,700,000 |  |
Cash paid for partial termination of 1.125% Warrants |  | $ 306 | $ 113 |  | $ 113 |  |
Number of warrants terminated (in shares) |  | 3,400,000 |  |  | 2,400,000 |  |
Restructuring and separation costs |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  | $ 23 |

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