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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory, Net [Abstract]    
Raw materials and work in process $ 9,738 $ 9,295
Finished goods 6,462 6,099
Unbilled shipments 467 378
Inventory, Gross, Total 16,667 15,772
Less revaluation to LIFO (386) (398)
Total $ 16,281 $ 15,374