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Statement Of Consolidated Operations (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Statement Of Consolidated Operations [Abstract]      
Sales (Q) $ 24,951 $ 21,013 $ 18,439
Cost of goods sold (exclusive of expenses below) 20,480 17,174 16,902
Selling, general administrative, and other expenses 1,027 961 1,009
Research and development expenses 184 174 169
Provision for depreciation, depletion, and amortization 1,479 1,450 1,311
Restructuring and other charges (D) 281 207 237
Interest expense (V) 524 494 470
Other (income) expenses, net (O) (87) 5 (161)
Total costs and expenses 23,888 20,465 19,937
Income (loss) from continuing operations before income taxes 1,063 548 (1,498)
Provision (benefit) for income taxes (T) 255 148 (574)
Income (loss) from continuing operations 808 400 (924)
Loss from discontinued operations (B) (3) (8) (166)
Net income (loss) 805 392 (1,090)
Less: Net income attributable to noncontrolling interests 194 138 61
Net Income (Loss) Attributable to Alcoa 611 254 (1,151)
Amounts Attributable to Alcoa Common Shareholders:      
Income (loss) from continuing operations 614 262 (985)
Loss from discontinued operations (3) (8) (166)
Net income (loss) $ 611 $ 254 $ (1,151)
Basic:      
Income (loss) from continuing operations $ 0.58 [1] $ 0.25 [1] $ (1.06)
Loss from discontinued operations $ (0.01) [1]   $ (0.17)
Net income (loss) $ 0.57 [1] $ 0.25 [1] $ (1.23)
Diluted:      
Income (loss) from continuing operations $ 0.55 [1] $ 0.25 [1] $ (1.06)
Loss from discontinued operations   $ (0.01) [1] $ (0.17)
Net income (loss) $ 0.55 [1] $ 0.24 [1] $ (1.23)
[1] 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.