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Derivative Instruments - Impact on Statements of Income, Net Investment Hedges (Details 2c) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net Investment Hedging [Member] | Foreign exchange
   
Net investment hedge gains and losses [Abstract]    
Excluded components recorded directly in income $ (55) $ (71)
Accumulated Translation Adjustment [Member]
   
Net investment hedge gains and losses [Abstract]    
Gains/(losses) - effective portion recorded in OCI $ (267) $ (390)