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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |
Legal fees | $ 13 | $ 15 |
Reverse mortgage servicing rights, excluding subservicing |  |  |
Loss Contingencies [Line Items] |  |  |
UPB | 17,269 |  | $ 18,091
Warehouse facilities, net of unamortized debt issuance costs |  |  |
Loss Contingencies [Line Items] |  |  |
Unfunded advance obligations | 2,113 |  | $ 2,202
Litigation and regulatory matters | Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Estimate of possible loss | 2 |  |
Litigation and regulatory matters | Maximum |  |  |
Loss Contingencies [Line Items] |  |  |
Estimate of possible loss | $ 18 |  |

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