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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Loss Contingencies [Line Items]          
Legal fees $ 12 $ 21 $ 27 $ 32  
UPB 277,975   277,975   $ 296,782
Reverse mortgage servicing rights, excluding subservicing          
Loss Contingencies [Line Items]          
UPB 20,758   20,758   22,725
Warehouse facilities, net of unamortized debt issuance costs          
Loss Contingencies [Line Items]          
Unfunded advance obligations 2,408   2,408   $ 2,617
Litigation and regulatory matters | Minimum          
Loss Contingencies [Line Items]          
Estimate of possible loss 2   2    
Litigation and regulatory matters | Maximum          
Loss Contingencies [Line Items]          
Estimate of possible loss $ 18   $ 18