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Segment Information - Schedule of Combined Segment Adjusted EBITDA to Net Income Attributable to Arconic (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Total segment operating profit | $ 524 | $ 391 | $ 1,511 | $ 1,225 |  |
Restructuring and other charges | (119) | 2 | (630) | (20) |  |
Operating income | 326 | 345 | 619 | 1,002 |  |
Interest expense | (86) | (88) | (256) | (291) |  |
Other expense, net | (31) | (8) | (92) | (69) | $ (92) | $ (69)
Income before income taxes | 209 | 249 | 271 | 642 |  |
Segment Reconciling Items |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Restructuring and other charges | (119) | 2 | (630) | (20) |  |
Corporate expense | (79) | (48) | (262) | (203) |  |
Operating income | 326 | 345 | 619 | 1,002 |  |
Interest expense | (86) | (88) | (256) | (291) |  |
Other expense, net | (31) | (8) | (92) | (69) |  |
Income before income taxes | $ 209 | $ 249 | $ 271 | $ 642 |  |

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