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Segment and Geographic Area Information - Schedule of Segment EBITDA to Consolidated Net (Loss) Income Attributable to Arconic (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 19, 2017 | 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] |  |  |  |  |  |  |  |  |  |  |  |
Combined segment adjusted EBITDA |  |  |  |  |  |  |  |  |  | $ 2,144 | $ 2,063 | $ 1,894
Impairment of goodwill |  |  |  |  |  |  |  |  |  | (719) | 0 | (25)
Restructuring and other charges |  |  |  |  |  |  |  |  |  | (165) | (155) | (214)
Operating income |  |  |  |  |  |  |  |  |  | 326 | 819 | 628
Interest expense | $ (24) |  |  |  |  |  |  |  |  | (496) | (499) | (473)
Other income, net |  |  |  |  |  |  |  |  |  | 640 | 94 | 28
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  | 470 | 414 | 183
Provision for income taxes |  |  |  |  |  |  |  |  |  | (544) | (1,476) | (339)
Discontinued operations |  |  |  |  |  |  |  |  |  | 0 | 121 | (165)
Net loss attributable to Arconic |  | $ (727) | $ 119 | $ 212 | $ 322 | $ (1,258) | $ 166 | $ 135 | $ 16 | (74) | (941) | (322)
Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (551) | (535) | (508)
Impairment of goodwill |  |  |  |  |  |  |  |  |  | (719) | 0 | (25)
Restructuring and other charges |  |  |  |  |  |  |  |  |  | (165) | (155) | (214)
Impact of LIFO |  |  |  |  |  |  |  |  |  | (110) | (18) | 101
Metal price lag |  |  |  |  |  |  |  |  |  | 72 | 27 | (175)
Corporate expense |  |  |  |  |  |  |  |  |  | (274) | (454) | (371)
Other |  |  |  |  |  |  |  |  |  | (71) | (109) | (74)
Operating income |  |  |  |  |  |  |  |  |  | 326 | 819 | 628
Interest expense |  |  |  |  |  |  |  |  |  | (496) | (499) | (473)
Other income, net |  |  |  |  |  |  |  |  |  | 640 | 94 | 28
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  | 470 | 414 | 183
Provision for income taxes |  |  |  |  |  |  |  |  |  | (544) | (1,476) | (339)
Discontinued operations |  |  |  |  |  |  |  |  |  | 0 | 121 | (165)
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ (1)

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