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Mortgage Loans Held for Sale and Investment - Mortgage Loans Held For Investment - UPB, Fair Value (Details) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Mortgage Loans Held For Investment [Roll Forward]        
Balance - beginning of period     $ 119  
Changes in fair value   $ 0 3  
Balance - end of period $ 0   0  
Mortgage loans held for investment, net        
Mortgage Loans Held For Investment [Roll Forward]        
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   (2) (11)  
Transfers to real estate owned   0 (5)  
Changes in fair value   0 3  
Losses incurred   (1) 0  
Balance - end of period 0 $ 122 $ 0  
UPB       $ 27
Fair Value       $ 13
Trust 2009-A        
Mortgage Loans Held For Investment [Roll Forward]        
Sale of mortgage loans (94)      
Transfers to mortgage loans held for sale (12)      
Transfers to real estate owned $ (5)