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Mortgage Loans Held for Sale and Investment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Feb. 01, 2019
Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]        
Mortgage loans held for sale in foreclosure $ 20     $ 33
Sale of mortgage loans held for sale 6,194      
Gain on sale of mortgage loans held for sale 106      
Mortgage loans held for investment in foreclosure 13     $ 15
Ginnie Mae Loans        
Servicing Assets at Fair Value [Line Items]        
Delinquent loans acquired 67      
Delinquent loans securitized or sold 39      
Purchased loans that have re-performed $ 43      
Predecessor        
Servicing Assets at Fair Value [Line Items]        
Sale of mortgage loans held for sale   $ 5,709    
Gain on sale of mortgage loans held for sale   60    
Predecessor | Ginnie Mae Loans        
Servicing Assets at Fair Value [Line Items]        
Delinquent loans acquired   68    
Delinquent loans securitized or sold   88    
Purchased loans that have re-performed   $ 39    
Pacific Union        
Servicing Assets at Fair Value [Line Items]        
Mortgage loans held for sale     $ 536