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Loan Servicing (Residential MSRs Sensitivity) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Residential MSRs    
Servicing Assets at Fair Value [Line Items]    
Composition of loans serviced for others 100.00% 100.00%
Weighted average life (in years) 7 years 6 years 9 months 18 days
Residential MSRs | Min    
Servicing Assets at Fair Value [Line Items]    
Prepayment speed 7.50% 8.10%
OAS 9.80% 10.30%
Residential MSRs | Max    
Servicing Assets at Fair Value [Line Items]    
Prepayment speed 8.40% 9.00%
OAS 10.20% 10.60%
Residential MSRs | Weighted Average    
Servicing Assets at Fair Value [Line Items]    
Prepayment speed 8.10% 8.70%
Effect on fair value of a 10% increase $ (28) $ (29)
Effect on fair value of a 20% increase $ (54) $ (56)
OAS 10.00% 10.40%
Effect on fair value of a 10% increase $ (33) $ (33)
Effect on fair value of a 20% increase $ (64) $ (63)
Fixed Rate Residential Mortgage    
Servicing Assets at Fair Value [Line Items]    
Composition of loans serviced for others 99.10% 99.20%
Adjustable Rate Residential Mortgage    
Servicing Assets at Fair Value [Line Items]    
Composition of loans serviced for others 0.90% 0.80%