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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Mortgage Servicing Rights [Line Items] |  |  |  |
Rental expense | $ 16 | $ 19 | $ 31 | $ 26
Litigation and Regulatory Matters |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
Legal fees | 22 | $ 40 | 40 | $ 64
Reverse Mortgage Servicing Rights, Excluding Subservicing |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights | 28,415 |  | 34,635 |
Reverse mortgage interests, net |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
Principal amount outstanding on mortgage servicing rights | 28,415 |  | 35,112 |
Maximum unfunded advance obligation | 3,128 |  | $ 3,713 |
Minimum | Litigation and Regulatory Matters |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
Reasonably possible loss | 4 |  |  |
Maximum | Litigation and Regulatory Matters |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
Reasonably possible loss | $ 16 |  |  |

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