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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Mortgage Servicing Rights [Line Items]        
Operating lease, rent expense     $ 39  
Rental expense $ 16 $ 19   $ 31
Litigation and Regulatory Matters        
Mortgage Servicing Rights [Line Items]        
Legal fees 22 $ 40 64 $ 40
Reverse Mortgage Servicing Rights, Excluding Subservicing        
Mortgage Servicing Rights [Line Items]        
Principal amount outstanding on mortgage servicing rights 28,415   22,725  
Reverse mortgage interests        
Mortgage Servicing Rights [Line Items]        
Principal amount outstanding on mortgage servicing rights 28,415   22,725  
Maximum unfunded advance obligation $ 3,128   2,617  
Minimum | Litigation and Regulatory Matters        
Mortgage Servicing Rights [Line Items]        
Reasonably possible loss     18  
Maximum | Litigation and Regulatory Matters        
Mortgage Servicing Rights [Line Items]        
Reasonably possible loss     $ 37