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Loan Servicing - Residential MSR Sensitivity (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Residential MSRs    
Servicing Liabilities at Fair Value [Line Items]    
Prepayment speed 12.00% 8.70%
Effect on fair value of a 10% increase $ (32) $ (28)
Effect on fair value of a 20% increase $ (62) $ (54)
OAS 10.00% 10.40%
Effect on fair value of a 10% increase $ (25) $ (32)
Effect on fair value of a 20% increase $ (49) $ (61)
Composition of loans serviced for others 100.00% 100.00%
Weighted average life (in years) 5 years 6 months 6 years 9 months 18 days
Fixed-rate residential mortgage loans    
Servicing Liabilities at Fair Value [Line Items]    
Composition of loans serviced for others 99.20% 99.20%
Adjustable-rate residential mortgage loans    
Servicing Liabilities at Fair Value [Line Items]    
Composition of loans serviced for others 0.80% 0.80%
Minimum | Residential MSRs    
Servicing Liabilities at Fair Value [Line Items]    
Prepayment speed 10.90% 8.10%
OAS 9.90% 10.30%
Maximum | Residential MSRs    
Servicing Liabilities at Fair Value [Line Items]    
Prepayment speed 12.60% 9.00%
OAS 10.20% 10.60%