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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Income from discontinued operations after income taxes | $ 125 | $ 26
Less: Net income from discontinued operations attributable to noncontrolling interests | 43 | 38
Net income (loss) from discontinued operations | 82 | (12)
Alcoa Corporation [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Sales | 2,061 | 3,953
Cost of goods sold (exclusive of expenses below) | 1,683 | 3,324
Selling, general administrative, and other expenses | 47 | 102
Research and development expenses | 7 | 18
Provision for depreciation, depletion and amortization | 177 | 352
Restructuring and other charges | 9 | 86
Interest expense | 5 | 11
Other (income) expense, net | (21) | 26
Income from discontinued operations before income taxes | 154 | 34
Provision for income taxes | 29 | 8
Income from discontinued operations after income taxes | 125 | 26
Less: Net income from discontinued operations attributable to noncontrolling interests | 43 | 38
Net income (loss) from discontinued operations | $ 82 | $ (12)

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