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Loan Servicing (Residential MSRs Sensitivity) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Yr
Dec. 31, 2013
Yr
Residential Mortgage Servicing Rights [Member]
   
Weighted average prepayment speed 9.30% 6.90%
Effect on fair value of a 10% increase in weighted average prepayment speed $ (31) $ (33)
Effect on fair value of a 20% increase in weighted average prepayment speed (61) (64)
Weighted average OAS 9.20% 9.30%
Effect on fair value of a 10% increase in weighted average OAS (32) (39)
Effect on fair value of a 20% increase in weighted average OAS $ (62) $ (75)
Composition of residential mortgage loans serviced for others 100.00% 100.00%
Weighted average life, in years 6.7 7.9
Residential Mortgage Servicing Rights [Member] | Maximum [Member]
   
Weighted average prepayment speed 10.20% 8.00%
Weighted average OAS 9.80% 9.90%
Residential Mortgage Servicing Rights [Member] | Minimum [Member]
   
Weighted average prepayment speed 7.40% 5.50%
Weighted average OAS 9.00% 9.10%
Fixed-Rate Residential Mortgage [Member]
   
Composition of residential mortgage loans serviced for others 99.70% 99.70%
Adjustable Rate Residential Mortgage [Member]
   
Composition of residential mortgage loans serviced for others 0.30% 0.30%