Investments (Tables)

9 Months Ended

Sep. 30, 2016

Investments Schedule [Abstract]

Summary of Financial Information for Alcoa Corporation's Equity Investments

A summary of unaudited financial information for Alcoa Corporation’s equity investments is as follows (amounts represent 100% of investee financial information):

	Third quarter ended September 30,					Nine months ended September 30,
	2016			2015		2016		2015
Sales	$	888		$	1,015	$	2,684	$	2,872
Cost of goods sold		840			796		2,200		2,353
Net (loss) income		(6	)		20		23		(66	)