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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Earnings Per Share [Abstract] |  |  |  |
Net income attributable to Arconic | $ 166 | $ 44 | $ 317 | $ 379
Less: preferred stock dividends declared | 18 | 18 | 52 | 52
Net income available to Arconic common shareholders - basic | 148 | 26 | 265 | 327
Add: interest expense related to convertible notes | 2 |  |  |
Add: dividends related to mandatory convertible preferred stock | 0 | 0 | 0 | 0
Net income available to Arconic common shareholders - diluted | $ 150 | $ 26 | $ 265 | $ 327
Average shares outstanding - basic | 438 | 427 | 438 | 414
Stock options | 1 |  | 1 | 1
Stock and performance awards | 5 | 4 | 4 | 4
Convertible notes | 9 |  |  |
Mandatory convertible preferred stock | 0 | 0 | 0 | 0
Average shares outstanding - diluted | 453 | 431 | 443 | 419

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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256 + Details
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