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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
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):
|  | First quarter ended March 31, |
|  | 2013 |  |  | 2012 |
Net income attributable to Alcoa common shareholders |  | $ | 149 |  |  | $ | 94 |
Less: preferred stock dividends declared |  |  | 1 |  |  |  | 1 |
Net income available to common equity |  |  | 148 |  |  |  | 93 |
Less: dividends and undistributed earnings allocated to participating securities |  |  | — |  |  |  | — |
Net income available to Alcoa common shareholders – basic |  |  | 148 |  |  |  | 93 |
Add: interest expense related to convertible notes |  |  | 8 |  |  |  | 8 |
Net income available to Alcoa common shareholders – diluted |  | $ | 156 |  |  | $ | 101 |
Average shares outstanding – basic |  |  | 1,069 |  |  |  | 1,066 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options |  |  | 3 |  |  |  | 4 |
Stock and performance awards |  |  | 8 |  |  |  | 5 |
Convertible notes |  |  | 89 |  |  |  | 89 |
Average shares outstanding – diluted |  |  | 1,169 |  |  |  | 1,164 |

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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