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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Loss Contingencies [Line Items] |  |  |  |  |
Legal fees | $ 21 | $ 3 | $ 32 | $ 7 |
Reverse Mortgage Servicing Rights, Excluding Subservicing |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
UPB | 25,569 |  | 25,569 |  | $ 28,415
Warehouse facilities, net of unamortized debt issuance costs |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Unfunded advance obligations | 2,869 |  | 2,869 |  | $ 3,128
Litigation and Regulatory Matters | Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | 16 |  | 16 |  |
Litigation and Regulatory Matters | Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | $ 45 |  | $ 45 |  |

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