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v3.8.0.1

Quarterly Data - Schedule of Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales revenue, goods, net | $ 3,271 | $ 3,236 | $ 3,261 | $ 3,192 | $ 2,967 | $ 3,138 | $ 3,234 | $ 3,055 | $ 12,960 | $ 12,394 | $ 12,413
Net income (loss) attributable to Arconic | $ (727) | $ 119 | $ 212 | $ 322 | $ (1,258) | $ 166 | $ 135 | $ 16 | $ (74) | $ (941) | $ (322)
Basic |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in usd per share) |  |  |  |  | $ (2.98) | $ 0.11 | $ 0.08 | $ 0.21 | $ (0.28) | $ (2.58) | $ (0.54)
Discontinued operations (in usd per share) |  |  |  |  | 0.07 | 0.23 | 0.19 | (0.21) | 0.00 | 0.27 | (0.39)
Net loss per share-basic (in usd per share) | $ (1.51) | $ 0.23 | $ 0.44 | $ 0.69 | (2.91) | 0.34 | 0.27 | 0.00 | (0.28) | (2.31) | (0.93)
Diluted |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in usd per share) |  |  |  |  | (2.98) | 0.11 | 0.08 | 0.21 | (0.28) | (2.58) | (0.54)
Discontinued operations (in usd per share) |  |  |  |  | 0.07 | 0.22 | 0.19 | (0.21) | 0.00 | 0.27 | (0.39)
Net loss per share-diluted (in usd per share) | $ (1.51) | $ 0.22 | $ 0.43 | $ 0.65 | $ (2.91) | $ 0.33 | $ 0.27 | $ 0.00 | $ (0.28) | $ (2.31) | $ (0.93)
Goodwill impairment |  |  |  |  |  |  |  |  | $ 719 | $ 0 | $ 25
Tax cuts and jobs act of 2017, incomplete accounting, provisional income tax expense (benefit) | $ 272 |  |  |  |  |  |  |  |  |  |
Disposal group, contingent liability, period increase (decrease), net of tax | 18 |  |  |  |  |  |  |  |  |  |
Disposal group, contingent liability, period increase (decrease) | 25 |  |  |  |  |  |  |  |  |  |
Increase to allowance |  |  |  |  | $ 1,267 |  |  |  | 831 | 772 | $ 180
Firth Rixson |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |
Business combination, contingent consideration arrangements, change in amount of contingent consideration, liability, net of tax |  |  |  |  |  |  |  |  | 81 |  |
Contingent consideration arrangements, change in amount of contingent consideration, liability | (81) |  |  |  | $ (56) |  |  |  | 81 | $ 56 |
Engineered Products and Solutions |  |  |  |  |  |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |  |  |  |
Goodwill, impairment loss, net of tax | 719 |  |  |  |  |  |  |  |  |  |
Goodwill impairment | $ 719 |  |  |  |  |  |  |  | $ 719 |  |

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