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Securitizations and Variable Interests Entities - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]      
Average period to securitization 30 days    
MSRs retained $ 36,000,000 $ 39,800,000 $ 74,800,000
Percentage of transferred residential loans serviced 60 days or more past due 8.20% 5.10%  
Charge-offs, net of recovers, associated with transferred residential loans serviced 60 days or more past due $ 500,000 $ 0  
Minimum [Member]      
Servicing Assets at Fair Value [Line Items]      
Number of days that transferred residential loans serviced were past due 60 days    
HMBS - Related Borrowings [Member]      
Servicing Assets at Fair Value [Line Items]      
HMBS-related borrowings $ 2,400,000,000 1,400,000,000  
HECM [Member]      
Servicing Assets at Fair Value [Line Items]      
HECMs pledged as collateral $ 2,500,000,000 $ 1,600,000,000