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Mortgage Loans Held for Sale and Investment - Mortgage Loans Held for Investment (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jul. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total mortgage loans held for investment $ 122    
Mortgage loans held for investment, net      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgage loans held for investment, net – UPB 161    
Fair value adjustments (39)    
Total mortgage loans held for investment $ 122 $ 125  
Predecessor      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total mortgage loans held for investment     $ 139
Predecessor | Mortgage loans held for investment, net      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgage loans held for investment, net – UPB     193
Non-accretable     (41)
Accretable     (12)
Allowance for loan losses     (1)
Total mortgage loans held for investment     $ 139