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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 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):
|  | Third quarter ended September 30, |  |  | Nine months ended September 30, |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
(Loss) income from continuing operations attributable to Alcoa common shareholders |  | $ | (143 | ) |  | $ | 172 |  |  | $ | (51 | ) |  | $ | 807 |
Less: preferred stock dividends declared |  |  | 1 |  |  |  | 1 |  |  |  | 2 |  |  |  | 2 |
(Loss) income from continuing operations available to common equity |  |  | (144 | ) |  |  | 171 |  |  |  | (53 | ) |  |  | 805 |
Less: dividends and undistributed earnings allocated to participating securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2 |
(Loss) income from continuing operations available to Alcoa common shareholders – basic |  |  | (144 | ) |  |  | 171 |  |  |  | (53 | ) |  |  | 803 |
Add: interest expense related to convertible notes |  |  | — |  |  |  | 8 |  |  |  | — |  |  |  | 22 |
(Loss) income from continuing operations available to Alcoa common shareholders – diluted |  | $ | (144 | ) |  | $ | 179 |  |  | $ | (53 | ) |  | $ | 825 |
Average shares outstanding – basic |  |  | 1,067 |  |  |  | 1,064 |  |  |  | 1,066 |  |  |  | 1,060 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 8 |
Stock and performance awards |  |  | — |  |  |  | 4 |  |  |  | — |  |  |  | 3 |
Convertible notes |  |  | — |  |  |  | 89 |  |  |  | — |  |  |  | 89 |
Average shares outstanding – diluted |  |  | 1,067 |  |  |  | 1,164 |  |  |  | 1,066 |  |  |  | 1,160 |

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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
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Namespace Prefix: | aa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration