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Mortgage Loans Held for Sale and Investment - Mortgage Loans Held for Investment (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jul. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total mortgage loans held for investment, net $ 119    
Mortgage Loans Held for Investment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgage loans held for investment, net - UPB 156    
Fair value adjustments (37)    
Total mortgage loans held for investment, net $ 119 $ 125  
Predecessor      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total mortgage loans held for investment, net     $ 139
Predecessor | Mortgage Loans Held for Investment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgage loans held for investment, net - UPB     193
Transfer discount - non-accretable     (41)
Transfer discount - accretable     (12)
Allowance for loan losses     (1)
Total mortgage loans held for investment, net     $ 139