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Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Earnings Per Share Basic And Diluted By Common Class [Line Items] |  |
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
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 Amount of dividends paid to participating securities (unvested awards) on a basis equivalent to holders of an entity's common stock plus an allocation of the undistributed earnings of an entity to the participating securities on the same basis as the paid dividends. This deduction in the EPS reconciliation is only applicable in periods when an entity generates income as the holders of the participating securities do not share in the losses of an entity unlike a common shareholder. + References No definition available. + Details
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