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v3.19.1

Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2013
Class of Stock [Line Items] |  |  |  |
Number of warrants issued (in shares) |  |  |  | 13,500,000
Warrant, strike price per share (in dollars per share) |  |  |  | $ 53.8475
Cash paid for partial termination of 1.125% Warrants |  | $ 103 | $ 0 |
Share-based compensation |  | 9 | $ 6 |
Unrecognized compensation expense |  | $ 71 |  |
Unrecognized compensation forfeiture rate |  | 14.10% |  |
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 11 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 |  | $ 8 |  |
Weighted average period for recognition |  | 1 year 6 months |  |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of common stock issued (in shares) |  | 84,000 |  |
1.125% Warrants |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stated percentage of warrants |  | 1.125% |  |
Warrants outstanding (in shares) |  | 5,100,000 |  |
Cash paid for partial termination of 1.125% Warrants |  | $ 103 |  |
Number of warrants terminated (in shares) |  | 1,100,000 |  |
Subsequent Event | 1.125% Warrants |  |  |  |
Class of Stock [Line Items] |  |  |  |
Cash paid for partial termination of 1.125% Warrants | $ 298 |  |  |
Number of warrants terminated (in shares) | 3,100,000 |  |  |

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