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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, 2017
Dec. 31, 2016
Mortgage Servicing Rights [Line Items]        
Rental expense $ 16 $ 19 $ 31 $ 26
Litigation and Regulatory Matters        
Mortgage Servicing Rights [Line Items]        
Legal fees 22 $ 40 40 $ 64
Reverse Mortgage Servicing Rights, Excluding Subservicing        
Mortgage Servicing Rights [Line Items]        
Principal amount outstanding on mortgage servicing rights 28,415   34,635  
Reverse mortgage interests, net        
Mortgage Servicing Rights [Line Items]        
Principal amount outstanding on mortgage servicing rights 28,415   35,112  
Maximum unfunded advance obligation 3,128   $ 3,713  
Minimum | Litigation and Regulatory Matters        
Mortgage Servicing Rights [Line Items]        
Reasonably possible loss 4      
Maximum | Litigation and Regulatory Matters        
Mortgage Servicing Rights [Line Items]        
Reasonably possible loss $ 16