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Statement of Consolidated Operations - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Sales (I) $ 5,897 $ 5,836 $ 11,716 $ 11,290
Cost of goods sold (exclusive of expenses below) 4,663 4,765 9,106 9,260
Selling, general administrative, and other expenses 224 245 456 481
Research and development expenses 68 50 123 101
Provision for depreciation, depletion, and amortization 319 349 640 689
Restructuring and other charges (D) 217 110 394 571
Interest expense 124 105 246 225
Other (income) expenses, net (H)   5 (12) 30
Total costs and expenses 5,615 5,629 10,953 11,357
Income (loss) before income taxes 282 207 763 (67)
Provision for income taxes (K) 75 78 301 1
Net income (loss) 207 129 462 (68)
Less: Net income (loss) attributable to noncontrolling interests 67 (9) 127 (28)
Net income (loss) attributable to Alcoa $ 140 $ 138 $ 335 $ (40)
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA COMMON SHAREHOLDERS (J):        
Basic $ 0.10 $ 0.12 $ 0.25 $ (0.04)
Diluted 0.10 0.12 0.24 (0.04)
Dividends paid per common share $ 0.03 $ 0.03 $ 0.06 $ 0.06