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Financial Instruments (Fair value hedges) (Details) (Fair Value Hedges [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
Fair value hedges        
Hedge ineffectiveness gain (loss) $ (82) $ (130) $ (187) $ (203)
Hedge amount excluded from assessment of effectiveness insignificant amounts insignificant amounts insignificant amounts insignificant amounts
Interest Rate Contract [Member]
       
Fair value hedges        
Gain (loss) on derivatives 2,232 1,341 785 (390)
Gain (loss) on hedged items (2,312) (1,466) (962) 195
Foreign Exchange Contract [Member]
       
Fair value hedges        
Gain (loss) on derivatives (164) 15 (212) 39
Gain (loss) on hedged items $ 162 $ 20 $ 202 $ (47)