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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Loss Contingencies [Line Items]          
Legal fees $ 21 $ 3 $ 32 $ 7  
Reverse Mortgage Servicing Rights, Excluding Subservicing          
Loss Contingencies [Line Items]          
UPB 25,569   25,569   $ 28,415
Warehouse facilities, net of unamortized debt issuance costs          
Loss Contingencies [Line Items]          
Unfunded advance obligations 2,869   2,869   $ 3,128
Litigation and Regulatory Matters | Minimum          
Loss Contingencies [Line Items]          
Estimate of possible loss 16   16    
Litigation and Regulatory Matters | Maximum          
Loss Contingencies [Line Items]          
Estimate of possible loss $ 45   $ 45