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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