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Inventories, 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
Dec. 31, 2012
Jun. 30, 2012
Jun. 30, 2011
Not Designated As Hedging Instrument [Member]
     
Derivative [Line Items]      
FX Contracts Assets $ 170 $ 219 $ 237
Interest Contracts Assets 1   3
Commodity Contracts Assets 2,504 2,843 2,766
Other Contracts Asset   1  
Total fair value of derivative assets not designated as hedging instruments 2,675 3,063 3,006
FX Contracts Liabilities 215 291 178
Commodity Contracts Liabilities 2,376 2,704 2,553
Total fair value of derivative liabilities not designated as hedging instruments. $ 2,591 $ 2,995 $ 2,731