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Quarterly Data (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Quarterly Data | Supplemental Financial Information (unaudited) Quarterly Data (in millions, except per-share amounts)
|  | First |  |  | Second |  |  | Third |  |  | Fourth |  |  | Year |
2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 6,006 |  |  | $ | 5,963 |  |  | $ | 5,833 |  |  | $ | 5,898 |  |  | $ | 23,700 |
Amounts attributable to Alcoa common shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | 94 |  |  | $ | (2 | ) |  | $ | (143 | ) |  | $ | 242 |  |  | $ | 191 |
Loss from discontinued operations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net income (loss) |  | $ | 94 |  |  | $ | (2 | ) |  | $ | (143 | ) |  | $ | 242 |  |  | $ | 191 |
Earnings per share attributable to Alcoa common shareholders*: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | 0.09 |  |  | $ | - |  |  | $ | (0.13 | ) |  | $ | 0.23 |  |  | $ | 0.18 |
Loss from discontinued operations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net income (loss) |  | $ | 0.09 |  |  | $ | - |  |  | $ | (0.13 | ) |  | $ | 0.23 |  |  | $ | 0.18 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | 0.09 |  |  | $ | - |  |  | $ | (0.13 | ) |  | $ | 0.21 |  |  | $ | 0.18 |
Loss from discontinued operations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net income (loss) |  | $ | 0.09 |  |  | $ | - |  |  | $ | (0.13 | ) |  | $ | 0.21 |  |  | $ | 0.18 |
2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,958 |  |  | $ | 6,585 |  |  | $ | 6,419 |  |  | $ | 5,989 |  |  | $ | 24,951 |
Amounts attributable to Alcoa common shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | 309 |  |  | $ | 326 |  |  | $ | 172 |  |  | $ | (193 | ) |  | $ | 614 |
(Loss) income from discontinued operations |  |  | (1 | ) |  |  | (4 | ) |  |  | - |  |  |  | 2 |  |  |  | (3 | )
Net income (loss) |  | $ | 308 |  |  | $ | 322 |  |  | $ | 172 |  |  | $ | (191 | ) |  | $ | 611 |
Earnings per share attributable to Alcoa common shareholders*: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | 0.29 |  |  | $ | 0.31 |  |  | $ | 0.16 |  |  | $ | (0.18 | ) |  | $ | 0.58 |
(Loss) income from discontinued operations |  |  | - |  |  |  | (0.01 | ) |  |  | - |  |  |  | - |  |  |  | (0.01 | )
Net income (loss) |  | $ | 0.29 |  |  | $ | 0.30 |  |  | $ | 0.16 |  |  | $ | (0.18 | ) |  | $ | 0.57 |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  | $ | 0.27 |  |  | $ | 0.28 |  |  | $ | 0.15 |  |  | $ | (0.18 | ) |  | $ | 0.55 |
(Loss) income from discontinued operations |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Net income (loss) |  | $ | 0.27 |  |  | $ | 0.28 |  |  | $ | 0.15 |  |  | $ | (0.18 | ) |  | $ | 0.55 |
* | 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.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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