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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