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Mortgage Loans Held for Sale and Investment - Fair Value (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 loans held for investment at fair value        
Balance - beginning of period     $ 119  
Changes in fair value $ 2 $ 0 3 $ 0
Balance - end of period 119   0  
Mortgage Loans Held for Investment        
Mortgage loans held for investment at fair value        
Balance - beginning of period 125   119  
Sale of mortgage loans 0   (94)  
Transfers to mortgage loans held for sale 0   (12)  
Payments received from borrowers (5)   (11)  
Transfers to real estate owned 0   (5)  
Changes in fair value 2      
Charge-offs (3)   0  
Balance - end of period 119 $ 125 0  
Mortgage Loans Held for Investment        
Mortgage loans held for investment at fair value        
Sale of mortgage loans $ 0   (94)  
Transfers to mortgage loans held for sale     (12)  
Transfers to real estate owned     (5)  
Changes in fair value     $ 3