Statement of Consolidated Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]
Sales (J)	$ 6,239	$ 5,765	$ 17,529	$ 17,447
Cost of goods sold (exclusive of expenses below)	4,904	4,798	14,164	14,578
Selling, general administrative, and other expenses	243	248	724	753
Research and development expenses	57	44	158	135
Provision for depreciation, depletion, and amortization	347	348	1,036	1,071
Restructuring and other charges (D)	209	151	780	402
Interest expense	126	108	351	341
Other expenses (income), net (I)	23	(7)	53	(15)
Total costs and expenses	5,909	5,690	17,266	17,265
Income before income taxes	330	75	263	182
Provision for income taxes (M)	199	31	200	116
Net income	131	44	63	66
Less: Net (loss) income attributable to noncontrolling interests	(18)	20	(46)	12
NET INCOME ATTRIBUTABLE TO ALCOA	$ 149	$ 24	$ 109	$ 54
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA COMMON SHAREHOLDERS (L):
Basic	$ 0.13	$ 0.02	$ 0.09	$ 0.05
Diluted	$ 0.12	$ 0.02	$ 0.09	$ 0.05
Dividends paid per common share	$ 0.03	$ 0.03	$ 0.09	$ 0.09