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Financial Derivatives (Derivatives Designated in GAAP Hedge Relationships - Cash Flow Hedges) (Details) (Cash Flow Hedging [Member], Interest Rate Contracts [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Derivatives, Fair Value [Line Items]        
Gain/ Loss on Derivatives Recognized in OCI (Effective Portion) $ 154 $ 266 $ 207 $ 280
Interest Income [Member]
       
Derivatives, Fair Value [Line Items]        
Gain Reclassified from Accumulated OCI into Income (Effective Portion) 116 115 232 212
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion)   (1)    
Noninterest Income [Member]
       
Derivatives, Fair Value [Line Items]        
Gain Reclassified from Accumulated OCI into Income (Effective Portion) $ 32 $ 8 $ 59 $ 33