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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials $ 3,536 $ 3,573
Work-in-process 2,906 2,920
Finished goods 8,345 8,767
Supplies 287 287
Total inventories $ 15,074 $ 15,547