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Stockholders' Equity - Narrative (Details) - RSUs - Certain Employees - USD ($) shares in Thousands, $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Jul. 31, 2018 | Sep. 30, 2019
Class of Stock [Line Items] |  |  |  |  |
Shares granted (in shares) |  | 73 |  | 3,297 | 2,525
Compensation expense |  | $ 2 | $ 5 |  | $ 14
Tranche One |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage |  |  |  |  | 33.30%
Tranche Two |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage |  |  |  |  | 33.30%
Tranche Three |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Vesting percentage |  |  |  |  | 33.40%
Nationstar Mortgage Holdings Inc. |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Compensation expense | $ 9 |  |  | $ 17 |
One-time accelerated vesting |  |  |  | $ 7 |

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