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Financial Instruments (Free-standing derivatives) (Details) (Free Standing Derivatives [Member], USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Free standing derivatives    
Gain (loss) on derivatives $ (644) $ 66
Interest Rate Contract [Member]
   
Free standing derivatives    
Gain (loss) on derivatives (211) 32
Foreign Exchange Contract [Member]
   
Free standing derivatives    
Gain (loss) on derivatives (428) 9
Other Contract [Member]
   
Free standing derivatives    
Gain (loss) on derivatives $ (5) $ 25