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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Reconciliation of Information Used to Compute Basic and Diluted EPS | The information used to compute basic and diluted EPS attributable to Alcoa common shareholders was as follows (shares in millions):
|  | 2012 |  |  | 2011 |  |  | 2010 |
Income from continuing operations attributable to Alcoa common shareholders |  | $ | 191 |  |  | $ | 614 |  |  | $ | 262 |
Less: preferred stock dividends declared |  |  | 2 |  |  |  | 2 |  |  |  | 2 |
Income from continuing operations available to common equity |  |  | 189 |  |  |  | 612 |  |  |  | 260 |
Less: dividends and undistributed earnings allocated to participating securities |  |  | - |  |  |  | 1 |  |  |  | 1 |
Income from continuing operations available to Alcoa common shareholders—basic |  |  | 189 |  |  |  | 611 |  |  |  | 259 |
Add: interest expense related to convertible notes |  |  | - |  |  |  | 30 |  |  |  | - |
Income from continuing operations available to Alcoa common shareholders—diluted |  | $ | 189 |  |  | $ | 641 |  |  | $ | 259 |
Average shares outstanding—basic |  |  | 1,067 |  |  |  | 1,061 |  |  |  | 1,018 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | 3 |  |  |  | 7 |  |  |  | 6 |
Stock and performance awards |  |  | 6 |  |  |  | 4 |  |  |  | 1 |
Convertible notes |  |  | - |  |  |  | 89 |  |  |  | - |
Average shares outstanding—diluted |  |  | 1,076 |  |  |  | 1,161 |  |  |  | 1,025 |

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- Definition Disclosure of the description and amount of each reconciling item used to derive the numerator and denominator for the calculation of an entity's basic and diluted earnings per share. + References No definition available. + Details
Name: | aa_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTableTextBlock
Namespace Prefix: | aa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration