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Inventories (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Raw Materials	$ 4,018	$ 3,766
Work-in-process	3,488	2,959
Finished goods	9,775	7,562
Supplies	269	257
Total inventories	$ 17,550	$ 14,544

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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