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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2019
Jul. 31, 2018
Sep. 30, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]            
Legal fees   $ 5 $ 24   $ 56  
Reverse Mortgage Servicing Rights, Excluding Subservicing            
Loss Contingencies [Line Items]            
UPB     23,990   23,990 $ 28,415
Warehouse facilities, net of unamortized debt issuance costs            
Loss Contingencies [Line Items]            
Unfunded advance obligations     2,741   2,741 $ 3,128
Litigation and Regulatory Matters | Minimum            
Loss Contingencies [Line Items]            
Estimate of possible loss     20   20  
Litigation and Regulatory Matters | Maximum            
Loss Contingencies [Line Items]            
Estimate of possible loss     $ 57   $ 57  
Nationstar Mortgage Holdings Inc.            
Loss Contingencies [Line Items]            
Legal fees $ 33     $ 40