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Investments - Summary of Unaudited Financial Information for Alcoa's Equity Investments (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investments Schedule [Abstract]
Sales	$ 904	$ 971	$ 1,796	$ 1,857
Cost of goods sold	679	862	1,360	1,557
Net income (loss)	$ 14	$ (45)	$ 29	$ (86)

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The amount of the cost of sales reported by an equity method investment of the entity.

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The amount of net income (loss) reported by an equity method investment of the entity.

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The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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