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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Earnings Per Share [Abstract] |  |
Net income | $ 143 | $ 322
Less: Preferred stock dividends declared | (1) | (17)
Net income available to Arconic common shareholders - basic | 142 | 305
Add: Interest expense related to convertible notes | 3 | 2
Add: Dividends related to mandatory convertible preferred stock | 0 | 17
Net income available to Arconic common shareholders - diluted | $ 145 | $ 324
Average shares outstanding - basic (in shares) | 482 | 440
Effect of dilutive securities: |  |
Stock options (in shares) | 5 | 1
Stock and performance awards (in shares) | 2 | 5
Mandatory convertible preferred stock (in shares) | 0 | 39
Convertible notes (in shares) | 14 | 14
Weighted average shares outstanding - diluted (in shares) | 503 | 499

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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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- Definition The after-tax amount of interest recognized in the period associated with any convertible debt. + 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=96947427&loc=d3e1505-109256 + Details
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