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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