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Separation Transaction and Discontinued Operations - Summary of Discontinued Operations in Statement of Consolidated Operations (Details) - USD ($) $ in Millions | 10 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Income from discontinued operations after income taxes |  | $ 0 | $ 0 | $ 184
Less: Net income from discontinued operations attributable to noncontrolling interests |  | 0 | 0 | 63
Net income from discontinued operations |  | $ 0 | $ 0 | $ 121
Alcoa Corporation |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Sales | $ 6,752 |  |  |
Cost of goods sold (exclusive of expenses below) | 5,655 |  |  |
Selling, general administrative, and other expenses | 164 |  |  |
Research and development | 28 |  |  |
Provision for depreciation, depletion and amortization | 593 |  |  |
Restructuring and other charges | 102 |  |  |
Interest expense | 28 |  |  |
Other (income) expenses, net | (75) |  |  |
Income from discontinued operations before income taxes | 257 |  |  |
Provision for income taxes | 73 |  |  |
Income from discontinued operations after income taxes | 184 |  |  |
Less: Net income from discontinued operations attributable to noncontrolling interests | 63 |  |  |
Net income from discontinued operations | $ 121 |  |  |

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