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Segment Information - Schedule of Combined Segment Adjusted EBITDA to Net Income Attributable to Arconic (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 19, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Combined segment adjusted EBITDA |  | $ 535 | $ 515 | $ 1,640 | $ 1,607
Depreciation and amortization |  | (140) | (136) | (410) | (402)
Restructuring and other charges |  | (19) | (3) | (118) | (33)
Operating income |  | 271 | 237 | 797 | 790
Other income, net |  | 1 | 11 | 526 | 40
Interest expense | $ (24) | (100) | (126) | (398) | (371)
Income from continuing operations before income taxes |  | 172 | 122 | 925 | 459
Provision for income taxes |  | (53) | (56) | (272) | (230)
Discontinued operations |  |  | 100 |  | 88
Net income attributable to Arconic |  | 119 | 166 | 653 | 317
Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization |  | (140) | (136) | (410) | (402)
Restructuring and other charges |  | (19) | (3) | (118) | (33)
Impact of LIFO |  | (48) | (1) | (78) | (26)
Metal price lag |  | 2 | 4 | 43 | 10
Corporate expense |  | (42) | (113) | (224) | (304)
Other |  | (17) | (29) | (56) | (62)
Operating income |  | 271 | 237 | 797 | 790
Other income, net |  | 1 | 11 | 526 | 40
Interest expense |  | (100) | (126) | (398) | (371)
Income from continuing operations before income taxes |  | 172 | 122 | 925 | 459
Provision for income taxes |  | $ (53) | (56) | $ (272) | (230)
Discontinued operations |  |  | $ 100 |  | $ 88

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