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Derivative Instruments and Hedging Activities (Fair Value Of Derivatives Not Designated As Hedging Instruments) (Details) (Not Designated As Hedging Instrument [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Not Designated As Hedging Instrument [Member]
   
Derivative [Line Items]    
FX Contracts Assets $ 233 $ 170
Interest Contracts Assets 1 1
Commodity Contracts Assets 2,374 2,504
Total fair value of derivative assets not designated as hedging instruments 2,608 2,675
FX Contracts Liabilities 201 215
Commodity Contracts Liabilities 2,561 2,376
Total fair value of derivative liabilities not designated as hedging instruments. $ 2,762 $ 2,591