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Other Current Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Jun. 30, 2012
Jun. 30, 2011
Other Current Assets [Abstract]      
Unrealized gains on derivative contracts $ 2,676 $ 3,063 $ 3,007
Deferred receivables consideration 900 629  
Other current assets 2,972 2,901 2,884
Total other current assets $ 6,548 $ 6,593 $ 5,891