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Inventories (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Inventory, Net [Abstract]    
Raw materials and work in process $ 8,717 $ 6,973
Finished goods 5,724 4,501
Unbilled shipments 566 456
Inventory, Gross, Total 15,007 11,930
Less revaluation to LIFO (391) (404)
Total $ 14,616 $ 11,526