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Statement Of Consolidated Operations (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Statement Of Consolidated Operations [Abstract]    
Sales (H) $ 6,006 $ 5,958
Cost of goods sold (exclusive of expenses below) 5,098 4,715
Selling, general administrative, and other expenses 241 245
Research and development expenses 43 43
Provision for depreciation, depletion, and amortization 369 361
Restructuring and other charges (C) 10 6
Interest expense 123 111
Other income, net (G) (16) (28)
Total costs and expenses 5,868 5,453
Income from continuing operations before income taxes 138 505
Provision for income taxes 39 138
Income from continuing operations 99 367
Loss from discontinued operations   (1)
Net income 99 366
Less: Net income attributable to noncontrolling interests 5 58
NET INCOME ATTRIBUTABLE TO ALCOA 94 308
AMOUNTS ATTRIBUTABLE TO ALCOA COMMON SHAREHOLDERS:    
Income from continuing operations 94 309
Loss from discontinued operations   (1)
Net income $ 94 $ 308
Basic:    
Income from continuing operations $ 0.09 $ 0.29
Loss from discontinued operations      
Net income $ 0.09 $ 0.29
Diluted:    
Income from continuing operations $ 0.09 $ 0.27
Loss from discontinued operations      
Net income $ 0.09 $ 0.27
Dividends paid per common share $ 0.03 $ 0.03