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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 $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Derivatives, Fair Value [Line Items]    
Gain/ Loss on Derivatives Recognized in OCI (Effective Portion)$ 423$ 341$ 703$ 1,066
Interest Income [Member]
    
Derivatives, Fair Value [Line Items]    
Gain Reclassified from Accumulated OCI into Income (Effective Portion)12084332259
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) (2)  
Noninterest Income [Member]
    
Derivatives, Fair Value [Line Items]    
Gain Reclassified from Accumulated OCI into Income (Effective Portion)$ 8$ 8$ 41$ 33