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Stockholders' Equity - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased, value |  | $ 446,000,000 |  |  |  |  |
Common stock purchases |  |  |  |  | $ 453,000,000 | $ 0 |
Cash paid for partial termination of 1.125% Warrants |  |  |  |  | 30,000,000 | 424,000,000 |
Share-based compensation | $ 16,000,000 |  | $ 10,000,000 |  | 28,000,000 | $ 19,000,000 |
Unrecognized compensation expense | 85,000,000 |  |  |  | $ 85,000,000 |  |
Unrecognized compensation forfeiture rate |  |  |  |  | 11.30% |  |
Stock options granted (in shares) |  |  |  |  | 0 |  |
RSAs |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Weighted average period for recognition |  |  |  |  | 2 years 8 months 12 days |  |
PSUs |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Weighted average period for recognition |  |  |  |  | 1 year 8 months 12 days |  |
Employee stock option |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense | $ 1,000,000 |  |  |  | $ 1,000,000 |  |
1.125% Warrants |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Stated percentage of warrants | 1.125% |  |  |  | 1.125% |  |
Warrants outstanding (in shares) |  |  |  |  |  |  | 310,000
Cash paid for partial termination of 1.125% Warrants |  | $ 30,000,000 |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized amount |  |  |  |  |  |  | $ 500,000,000
Shares repurchased (in shares) |  | 3,400,000 |  |  |  |  |
Shares repurchased, value |  | $ 446,000,000 |  |  |  |  |
Shares repurchased (in dollars per share) |  | $ 132.45 |  |  |  |  |
Common stock purchases |  | $ 7,000,000 |  |  |  |  |
Number of common stock issued (in shares) |  |  |  | 1,000,000 | 188,000 |  |

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