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Mortgage Loans Held for Sale and Investment - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Feb. 01, 2019
Dec. 31, 2018
Servicing Assets at Fair Value [Line Items]        
Mortgage loans held for sale in foreclosure $ 16     $ 33
Sale of mortgage loans held for sale 15,422 $ 11,491    
Gain on sale of mortgage loans held for sale 219 114    
Mortgage loans held for investment in foreclosure 11     $ 15
Ginnie Mae Loans        
Servicing Assets at Fair Value [Line Items]        
Delinquent loans acquired 72 109    
Delinquent loans securitized or sold 117 135    
Purchased loans that have re-performed 19 $ 92    
Pacific Union        
Servicing Assets at Fair Value [Line Items]        
Mortgage loans held for sale $ 536   $ 536