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Inventories - Schedule of Inventory Components (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Finished goods	$ 769us-gaap_InventoryFinishedGoodsNetOfReserves	$ 768us-gaap_InventoryFinishedGoodsNetOfReserves
Work-in-process	1,106us-gaap_InventoryWorkInProcessNetOfReserves	1,035us-gaap_InventoryWorkInProcessNetOfReserves
Bauxite and alumina	594us-gaap_OtherInventoryNetOfReserves	578us-gaap_OtherInventoryNetOfReserves
Purchased raw materials	514us-gaap_InventoryRawMaterialsNetOfReserves	508us-gaap_InventoryRawMaterialsNetOfReserves
Operating supplies	190us-gaap_InventorySuppliesNetOfReserves	193us-gaap_InventorySuppliesNetOfReserves
Inventories, total	$ 3,173us-gaap_InventoryNet	$ 3,082us-gaap_InventoryNet

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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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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of unprocessed items to be consumed in the manufacturing or production process.

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Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

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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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Carrying amount, net of valuation reserves and allowances, as of the balance sheet date of inventories not otherwise specified in the taxonomy.

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