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Separation Transaction and Discontinued Operations - Summary of Discontinued Operations in Statement of Consolidated Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Income from discontinued operations after income taxes | $ 120 | $ 146
Less: Net income from discontinued operations attributable to noncontrolling interests | 20 | 58
Net income from discontinued operations | 100 | 88
Alcoa Corporation [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales | 2,075 | 6,028
Cost of goods sold (exclusive of expenses below) | 1,714 | 5,038
Selling, general administrative, and other expenses | 46 | 148
Research and development expenses | 8 | 26
Provision for depreciation, depletion and amortization | 180 | 532
Restructuring and other charges | 15 | 101
Interest expense | 7 | 18
Other income, net | (106) | (80)
Income from discontinued operations before income taxes | 211 | 245
Provision for income taxes | 91 | 99
Income from discontinued operations after income taxes | 120 | 146
Less: Net income from discontinued operations attributable to noncontrolling interests | 20 | 58
Net income from discontinued operations | $ 100 | $ 88

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