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Earnings Per Share - Reconciliation of Information Used to Compute Basic and Diluted EPS (Detail) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Earnings Per Share [Abstract] |  |  |  |
Net income (loss) attributable to Alcoa common shareholders | $ 140 | $ 138 | $ 335 | $ (40)
Less: preferred stock dividends declared | 17 |  | 35 | 1
Net income (loss) available to Alcoa common shareholders - basic | 123 | 138 | 300 | (41)
Add: dividends related to mandatory convertible preferred stock | 0 | 0 | 0 | 0
Add: interest expense related to convertible notes | 0 | 0 | 0 | 0
Net income (loss) available to Alcoa common shareholders - diluted | $ 123 | $ 138 | $ 300 | $ (41)
Average shares outstanding - basic | 1,222 | 1,173 | 1,222 | 1,137
Stock options | 4 | 6 | 5 |
Stock and performance awards | 11 | 10 | 11 |
Mandatory convertible preferred stock | 0 | 0 | 0 | 0
Convertible notes | 0 | 0 | 0 | 0
Average shares outstanding - diluted | 1,237 | 1,189 | 1,238 | 1,137

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