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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, 2012
Jun. 30, 2012
Not Designated As Hedging Instrument [Member]
   
Derivative [Line Items]    
FX Contracts Assets $ 222 $ 219
Interest Contracts Assets 1  
Commodity Contracts Assets 3,370 2,843
Other Contracts Asset   1
Total fair value of derivative assets not designated as hedging instruments 3,593 3,063
FX Contracts Liabilities 244 291
Commodity Contracts Liabilities 2,901 2,704
Other Contracts Liabilities 3  
Total fair value of derivative liabilities not designated as hedging instruments. $ 3,148 $ 2,995