Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Reconciliation of Information Used to Compute Basic and Diluted EPS

	First quarter ended March 31,
	2016			2015
Net income attributable to Alcoa	$	16		$	195
Less: preferred stock dividends declared		18			17
Net (loss) income available to Alcoa common shareholders – basic		(2	)		178
Add: dividends related to mandatory convertible preferred stock		—			—
Add: interest expense related to convertible notes		—			—
Net (loss) income available to Alcoa common shareholders – diluted	$	(2	)	$	178
Average shares outstanding – basic		1,314			1,221
Effect of dilutive securities:
Stock options		—			6
Stock and performance awards		—			11
Mandatory convertible preferred stock		—			—
Convertible notes		—			—
Average shares outstanding – diluted		1,314			1,238