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Arconic Inc. Separation Transaction and Discontinued Operations - Summary of Results of Discontinued Operations (Details) - Arconic Corporation - Discontinued Operations, Disposed of by Means Other than Sale - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |
Sales |  | $ 1,575
Cost of goods sold |  | 1,293
Selling, general administrative, research and development and other expenses |  | 106
Provision for depreciation and amortization |  | 58
Restructuring and other charges |  | (18)
Operating income from discontinued operations |  | 136
Interest expense, net |  | 7
Other expense, net |  | 41
Income from discontinued operations |  | 88
Provision for income taxes |  | 38
Income from discontinued operations after income taxes | $ 0 | $ 50

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