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Other Current Assets (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Other Assets [Abstract]    
Unrealized gains on derivative contracts $ 2,608 $ 2,676
Deferred receivables consideration 487 900
Other current assets 2,784 2,972
Total other current assets $ 5,879 $ 6,548