Quarterly Data (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Data [Abstract]

Schedule Of Quarterly Data

	First			Second			Third		Fourth			Year
2011
Sales	$	5,958		$	6,585		$	6,419	$	5,989		$	24,951
Amounts attributable to Alcoa common shareholders:
Income (loss) from continuing operations	$	309		$	326		$	172	$	(193	)	$	614
(Loss) income from discontinued operations		(1	)		(4	)		—		2			(3	)
Net income (loss)	$	308		$	322		$	172	$	(191	)	$	611
Earnings per share attributable to Alcoa common shareholders*:
Basic:
Income (loss) from continuing operations	$	0.29		$	0.31		$	0.16	$	(0.18	)	$	0.58
(Loss) income from discontinued operations		—			(0.01	)		—		—			(0.01	)
Net income (loss)	$	0.29		$	0.30		$	0.16	$	(0.18	)	$	0.57
Diluted:
Income (loss) from continuing operations	$	0.27		$	0.28		$	0.15	$	(0.18	)	$	0.55
(Loss) income from discontinued operations		—			—			—		—			—
Net income (loss)	$	0.27		$	0.28		$	0.15	$	(0.18	)	$	0.55
2010
Sales	$	4,887		$	5,187		$	5,287	$	5,652		$	21,013
Amounts attributable to Alcoa common shareholders:
(Loss) income from continuing operations	$	(194	)	$	137		$	61	$	258		$	262
Loss from discontinued operations		(7	)		(1	)		—		—			(8	)
Net (loss) income	$	(201	)	$	136		$	61	$	258		$	254
Earnings per share attributable to Alcoa common shareholders*:
Basic:
(Loss) income from continuing operations	$	(0.19	)	$	0.13		$	0.06	$	0.25		$	0.25
Loss from discontinued operations		(0.01	)		—			—		—			—
Net (loss) income	$	(0.20	)	$	0.13		$	0.06	$	0.25		$	0.25
Diluted:
(Loss) income from continuing operations	$	(0.19	)	$	0.13		$	0.06	$	0.24		$	0.25
Loss from discontinued operations		(0.01	)		—			—		—			(0.01	)
Net (loss) income	$	(0.20	)	$	0.13		$	0.06	$	0.24		$	0.24

* Per share amounts are calculated independently for each period presented; therefore, the sum of the quarterly per share amounts may not equal the per share amounts for the year.