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Derivatives (Hedges of Net Investments in Foreign Operations) (Details) (Foreign Operations Hedges [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion) $ 170 $ (51)
Foreign currency forwards [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion) 80 (52)
Currency options [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion) 90 1
Non-derivative hedging instruments [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion) $ 0 $ 0