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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Total segment operating profit | $ 400 | $ 451
Restructuring and other charges | (7) | (73)
Operating income | 333 | 283
Interest expense | (114) | (115)
Other (expense) income, net | (20) | 316
Income before income taxes | 199 | 484
Segment Reconciling Items |  |
Segment Reporting Information [Line Items] |  |
Restructuring and other charges | (7) | (73)
Corporate expense | (60) | (95)
Operating income | 333 | 283
Interest expense | (114) | (115)
Other (expense) income, net | (20) | 316
Income before income taxes | $ 199 | $ 484

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