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Inventories (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 2,990	$ 2,986
Work-in-process	2,335	2,455
Finished goods	6,514	6,504
Supplies	260us-gaap_InventorySuppliesNetOfReserves	260us-gaap_InventorySuppliesNetOfReserves
Total inventories	$ 12,099us-gaap_InventoryNet	$ 12,205us-gaap_InventoryNet

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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