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Quarterly Data (Schedule Of Quarterly Data) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Quarterly Data [Abstract]                      
Sales $ 5,989 $ 6,419 $ 6,585 $ 5,958 $ 5,652 $ 5,287 $ 5,187 $ 4,887 $ 24,951 $ 21,013 $ 18,439
Amounts Attributable to Alcoa Common Shareholders:                      
Income (loss) from continuing operations (193) 172 326 309 258 61 137 (194) 614 262 (985)
(Loss) income from discontinued operations 2   (4) (1)     (1) (7) (3) (8) (166)
Net Income (Loss) Attributable to Alcoa $ (191) $ 172 $ 322 $ 308 $ 258 $ 61 $ 136 $ (201) $ 611 $ 254 $ (1,151)
Basic:                      
Income (loss) from continuing operations $ (0.18) [1] $ 0.16 [1] $ 0.31 [1] $ 0.29 [1] $ 0.25 [1] $ 0.06 [1] $ 0.13 [1] $ (0.19) [1] $ 0.58 [1] $ 0.25 [1] $ (1.06)
(Loss) income from discontinued operations     $ (0.01) [1]         $ (0.01) [1] $ (0.01) [1]   $ (0.17)
Net income (loss) $ (0.18) [1] $ 0.16 [1] $ 0.30 [1] $ 0.29 [1] $ 0.25 [1] $ 0.06 [1] $ 0.13 [1] $ (0.20) [1] $ 0.57 [1] $ 0.25 [1] $ (1.23)
Diluted:                      
Income (loss) from continuing operations $ (0.18) [1] $ 0.15 [1] $ 0.28 [1] $ 0.27 [1] $ 0.24 [1] $ 0.06 [1] $ 0.13 [1] $ (0.19) [1] $ 0.55 [1] $ 0.25 [1] $ (1.06)
(Loss) income from discontinued operations               $ (0.01) [1]   $ (0.01) [1] $ (0.17)
Net income (loss) $ (0.18) [1] $ 0.15 [1] $ 0.28 [1] $ 0.27 [1] $ 0.24 [1] $ 0.06 [1] $ 0.13 [1] $ (0.20) [1] $ 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.