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Loan Servicing (Residential Mortgage Servicing Rights Sensitivity) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Yr
Weighted average life, in years 7.1
Residential Mortgage Servicing Rights [Member]
 
Weighted Average Prepayment speed 8.70%
Effect on fair value of a 10% increase in weighted average prepayment speed $ (32)
Effect on fair value of a 20% increase in weighted average prepayment speed (63)
Weighted average OAS 9.70%
Effect on fair value of a 10% increase in weighted average OAS (33)
Effect on fair value of a 20% increase in weighted average OAS $ (63)
Composition of residential mortgage loans serviced for others 100.00%
Residential Mortgage Servicing Rights [Member] | Maximum [Member]
 
Weighted Average Prepayment speed 11.90%
Weighted average OAS 10.20%
Residential Mortgage Servicing Rights [Member] | Minimum [Member]
 
Weighted Average Prepayment speed 6.90%
Weighted average OAS 9.50%
Fixed-Rate Residential Mortgage [Member]
 
Composition of residential mortgage loans serviced for others 99.60%
Adjustable Rate Residential Mortgage [Member]
 
Composition of residential mortgage loans serviced for others 0.40%