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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Loss Contingencies [Line Items]      
Legal fees $ 15 $ 11  
Reverse Mortgage Servicing Rights, Excluding Subservicing      
Loss Contingencies [Line Items]      
UPB 21,590   $ 22,725
Warehouse facilities, net of unamortized debt issuance costs      
Loss Contingencies [Line Items]      
Unfunded advance obligations 2,504   $ 2,617
Litigation and Regulatory Matters | Minimum      
Loss Contingencies [Line Items]      
Estimate of possible loss 17    
Litigation and Regulatory Matters | Maximum      
Loss Contingencies [Line Items]      
Estimate of possible loss $ 47