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Financial Instruments (Free-standing derivatives) (Details) (Free Standing Derivatives [Member], USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Free standing derivatives    
Gain (loss) on derivatives $ (1,052) $ (1,579)
Interest Rate Contract [Member]
   
Free standing derivatives    
Gain (loss) on derivatives (79) (132)
Foreign Exchange Contract [Member]
   
Free standing derivatives    
Gain (loss) on derivatives (997) (1,443)
Other Contract [Member]
   
Free standing derivatives    
Gain (loss) on derivatives $ 24 $ (4)