Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Reconciliation of Information Used to Compute Basic and Diluted EPS

The information used to compute basic and diluted EPS attributable to Alcoa common shareholders was as follows (shares in millions):

	Second quarter ended June  30,						Six months ended June 30,
	2013			2012			2013		2012
Net (loss) income attributable to Alcoa common shareholders	$	(119	)	$	(2	)	$	30	$	92
Less: preferred stock dividends declared		—			—			1		1
Net (loss) income available to common equity		(119	)		(2	)		29		91
Less: dividends and undistributed earnings allocated to participating securities		—			—			—		—
Net (loss) income available to Alcoa common shareholders – basic		(119	)		(2	)		29		91
Add: interest expense related to convertible notes		—			—			—		—
Net (loss) income available to Alcoa common shareholders – diluted	$	(119	)	$	(2	)	$	29	$	91
Average shares outstanding – basic		1,069			1,067			1,069		1,066
Effect of dilutive securities:
Stock options		—			—			2		4
Stock and performance awards		—			—			8		5
Convertible notes		—			—			—		—
Average shares outstanding – diluted		1,069			1,067			1,079		1,075