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Subsequent Events (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Nov. 08, 2016
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Subsequent Event [Line Items]        
Capitalization servicing rate (as a percent)     0.73% 0.89%
Servicing advances, net   $ 668 $ 668 $ 691
Private label solutions, mortgage production volume percentage     78.00%  
Subsequent Event        
Subsequent Event [Line Items]        
Commitment to sell Mortgage Servicing Rights, amount requires consent of originator prior to sale, percentage 30.00%      
GNMA Loans        
Subsequent Event [Line Items]        
Commitment to sell Mortgage Servicing Rights   $ 14,800 $ 14,800  
Capitalization servicing rate (as a percent)   0.70%    
Commitment to sell Mortgage servicing rights, fair value   $ 104 104  
Servicing advances, net   $ 16 $ 16  
GNMA Loans | Subsequent Event        
Subsequent Event [Line Items]        
Commitment to sell Mortgage Servicing Rights, MSR GNMA sales price $ 122      
Private Label Services | Minimum | Subsequent Event        
Subsequent Event [Line Items]        
Exit costs 75      
Private Label Services | Maximum | Subsequent Event        
Subsequent Event [Line Items]        
Exit costs $ 105