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Loan Servicing (Residential Mortgage Servicing Rights Sensitivity) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Dec. 31, 2009
Jun. 30, 2011
Residential Mortgage Servicing Rights [Member]
Jun. 30, 2011
Fixed-Rate Residential Mortgage [Member]
Jun. 30, 2011
Adjustable Rate Residential Mortgage [Member]
Residential mortgage servicing rights $ 879 $ 830 $ 665 $ 832 $ 879    
Percentage of mortgage loans serviced for others           99.00% 1.00%
Total         100.00%    
Weighted average life, in years         5.9    
Prepayment speed         11.70%    
Effect on fair value of a 10% increase         (37)    
Effect on fair value of a 20% increase         (70)    
Weighted average discount rate         10.30%    
Effect on fair value of a 10% increase         (36)    
Effect on fair value of a 20% increase         $ (68)