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Inventories - Schedule of Inventory Components (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Finished goods	$ 850	$ 768
Work-in-process	1,233	1,035
Bauxite and alumina	493	578
Purchased raw materials	790	508
Operating supplies	193	193
Inventories, total	$ 3,559	$ 3,082

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

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