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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
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to Alcoa | $ 135 | $ 140 | $ 151 | $ 335
Less: preferred stock dividends declared | 17 | 17 | 35 | 35
Net income available to Alcoa common shareholders - basic | 118 | 123 | 116 | 300
Add: interest expense related to convertible notes | 2 |  |  |
Add: dividends related to mandatory convertible preferred stock | 0 | 0 | 0 | 0
Net income available to Alcoa common shareholders - diluted | $ 120 | $ 123 | $ 116 | $ 300
Average shares outstanding - basic | 1,315 | 1,222 | 1,314 | 1,222
Stock options | 2 | 4 | 1 | 5
Stock and performance awards | 11 | 11 | 11 | 11
Convertible notes | 28 |  |  |
Mandatory convertible preferred stock | 0 | 0 | 0 | 0
Average shares outstanding - diluted | 1,356 | 1,237 | 1,326 | 1,238

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1930-109256 + Details
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