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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Loss Contingencies [Line Items] |  |  |  |  |
Legal fees | $ 9 | $ 24 | $ 36 | $ 56 |
Reverse mortgage servicing rights, excluding subservicing |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
UPB | 20,006 |  | 20,006 |  | $ 22,725
Warehouse facilities, net of unamortized debt issuance costs |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Unfunded advance obligations | 2,304 |  | 2,304 |  | $ 2,617
Litigation and regulatory matters | Minimum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | 3 |  | 3 |  |
Litigation and regulatory matters | Maximum |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Estimate of possible loss | $ 20 |  | $ 20 |  |

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