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Derivatives and Hedging Activities (Details 1) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]        
Net hedge ineffectiveness     $ (15) $ 46
Fair Value Hedging [Member] | Other Expense [Member] | Interest rate contracts [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative contract 142 289 (16) 413
Hedged item (138) (252) 1 (367)
Net hedge ineffectiveness $ 4 $ 37