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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
Mar. 31, 2014
Dec. 31, 2013
Not Designated As Hedging Instrument [Member]
   
Derivative [Line Items]    
FX Contracts Assets $ 132 $ 118
Interest Contracts Assets 1 1
Interest Rate Derivative Liabilities, at Fair Value 1  
Commodity Contracts Assets 995 850
Total fair value of derivative assets not designated as hedging instruments 1,128 969
FX Contracts Liabilities 140 166
Commodity Contracts Liabilities 811 649
Total fair value of derivative liabilities not designated as hedging instruments. $ 952 $ 815