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Derivative Instruments & Hedging Activities (Fair Value Of Derivatives Not Designated As Hedging Instruments) (Details) (Not Designated As Hedging Instrument [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Jun. 30, 2011
Not Designated As Hedging Instrument [Member]
   
FX Contracts Assets $ 288 $ 237
Interest Contracts Assets   3
Commodity Contracts Assets 2,135 2,766
Total fair value of derivative assets not designated as hedging instruments 2,423 3,006
FX Contracts Liabilities 307 178
Interest Contracts Liabilities     
Commodity Contracts Liabilities 2,240 2,553
Total fair value of derivative liabilities not designated as hedging instruments. $ 2,547 $ 2,731