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Other Current Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Other Current Assets [Abstract]    
Unrealized gains on derivative contracts $ 2,392 $ 2,676
Deferred receivables consideration 597 900
Other current assets 3,426 2,972
Total other current assets $ 6,415 $ 6,548