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Segment and Geographic Area Information - Schedule of Segment Operating Profit to Consolidated Net Income (Loss) Income Attributable to Arconic (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Total segment operating profit |  |  | $ 1,581,000,000 | $ 1,678,000,000 | $ 1,622,000,000
Impairment of goodwill | $ 0 |  | 0 | 719,000,000 | 0
Restructuring and other charges |  |  | (9,000,000) | (165,000,000) | (155,000,000)
Operating income |  |  | 1,325,000,000 | 480,000,000 | 954,000,000
Interest expense |  | $ (24,000,000) | (378,000,000) | (496,000,000) | (499,000,000)
Other (expense) income, net |  |  | (79,000,000) | 486,000,000 | (41,000,000)
Income from continuing operations before income taxes |  |  | 868,000,000 | 470,000,000 | 414,000,000
Segment Reconciling Item |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Impairment of goodwill |  |  | 0 | (719,000,000) | 0
Restructuring and other charges |  |  | (9,000,000) | (165,000,000) | (155,000,000)
Corporate expense |  |  | (247,000,000) | (314,000,000) | (513,000,000)
Operating income |  |  | 1,325,000,000 | 480,000,000 | 954,000,000
Interest expense |  |  | (378,000,000) | (496,000,000) | (499,000,000)
Other (expense) income, net |  |  | (79,000,000) | 486,000,000 | (41,000,000)
Income from continuing operations before income taxes |  |  | $ 868,000,000 | $ 470,000,000 | $ 414,000,000

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