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Statement Of Consolidated Operations (USD $)
In Millions, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Statement Of Consolidated Operations    
Sales (J)$ 6,419$ 5,287$ 18,962$ 15,361
Cost of goods sold (exclusive of expenses below)5,2904,41315,25212,636
Selling, general administrative, and other expenses261232759679
Research and development expenses4740136124
Provision for depreciation, depletion, and amortization3763581,1121,079
Restructuring and other charges (D)9249219
Interest expense125139399376
Other expenses (income), net (I)3143(47)48
Total costs and expenses6,1395,22717,66015,161
Income from continuing operations before income taxes280601,302200
Provision (benefit) for income taxes (M)55(49)32992
Income from continuing operations225109973108
Loss from discontinued operations (C)  (5)(8)
Net income225109968100
Less: Net income attributable to noncontrolling interests5348166104
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA17261802(4)
AMOUNTS ATTRIBUTABLE TO ALCOA COMMON SHAREHOLDERS:    
Income from continuing operations172618074
Loss from discontinued operations  (5)(8)
Net income (loss)$ 172$ 61$ 802$ (4)
Basic:    
Income from continuing operations$ 0.16$ 0.06$ 0.76 
Loss from discontinued operations  $ (0.01)$ (0.01)
Net income (loss)$ 0.16$ 0.06$ 0.75$ (0.01)
Diluted:    
Income from continuing operations$ 0.15$ 0.06$ 0.71 
Loss from discontinued operations   $ (0.01)
Net income (loss)$ 0.15$ 0.06$ 0.71$ (0.01)
Dividends paid per common share$ 0.03$ 0.03$ 0.09$ 0.09