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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Earnings Per Share [Abstract] |  |  |  |
Income from continuing operations after income taxes | $ 119 | $ 66 | $ 653 | $ 229
Less: Preferred stock dividends declared | (18) | (18) | (53) | (52)
Income from continuing operations available to Arconic common shareholders | 101 | 48 | 600 | 177
Income from discontinued operations after income taxes and noncontrolling interests |  | 100 |  | 88
Net income available to Arconic common shareholders - basic | 101 | 148 | 600 | 265
Add: Interest expense related to convertible notes | 2 | 2 | 7 |
Add: Dividends related to mandatory convertible preferred stock |  |  | 50 |
Net income available to Arconic common shareholders - diluted | $ 103 | $ 150 | $ 657 | $ 265
Weighted average shares outstanding - basic | 442 | 438 | 441 | 438
Stock options | 1 | 1 | 2 | 1
Stock and performance awards | 5 | 5 | 5 | 4
Mandatory convertible preferred stock |  |  | 39 |
Convertible notes | 14 | 9 | 14 |
Weighted average shares outstanding - diluted | 462 | 453 | 501 | 443

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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4613673-111683 + Details
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