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Statement of Consolidated Operations (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Sales (I) $ 5,573 $ 6,239 $ 17,289 $ 17,529
Cost of goods sold (exclusive of expenses below) 4,559 4,904 13,665 14,164
Selling, general administrative, and other expenses 261 243 717 724
Research and development expenses 55 57 178 158
Provision for depreciation, depletion, and amortization 318 347 958 1,036
Restructuring and other charges (D) 66 209 460 780
Interest expense 123 126 369 351
Other (income) expenses, net (H) (15) 23 (27) 53
Total costs and expenses 5,367 5,909 16,320 17,266
Income before income taxes 206 330 969 263
Provision for income taxes (K) 100 199 401 200
Net income 106 131 568 63
Less: Net income (loss) attributable to noncontrolling interests 62 (18) 189 (46)
Consolidated net income attributable to Alcoa 44 149 379 109
AMOUNTS ATTRIBUTABLE TO ALCOA COMMON SHAREHOLDERS (J):        
Net income $ 26 $ 149 $ 327 $ 108
Earnings per share:        
Basic $ 0.02 $ 0.13 $ 0.26 $ 0.09
Diluted 0.02 0.12 0.26 0.09
Dividends paid per share $ 0.03 $ 0.03 $ 0.09 $ 0.09