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Stockholders' Equity - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 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 | 103,000,000 |
Share-based compensation | 12,000,000 | $ 9,000,000 |
Unrecognized compensation expense | $ 89,000,000 |  |
Unrecognized compensation forfeiture rate | 10.70% |  |
Stock options granted (in shares) | 0 |  |
RSAs |  |  |
Class of Stock [Line Items] |  |  |
Weighted average period for recognition | 2 years 10 months 24 days |  |
PSUs |  |  |
Class of Stock [Line Items] |  |  |
Weighted average period for recognition | 1 year 10 months 24 days |  |
Employee Stock Option |  |  |
Class of Stock [Line Items] |  |  |
Unrecognized compensation expense | $ 3,000,000 |  |
Weighted average period for recognition | 6 months |  |
1.125% Warrants |  |  |
Class of Stock [Line Items] |  |  |
Stated percentage of warrants | 1.125% |  |
Warrants outstanding |  |  | 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) | 98,000 | 1,000,000 |

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