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Separation Transaction and Discontinued Operations - Summary of Discontinued Operations in Statement of Consolidated Cash Flows (Details) - Alcoa Corporation $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |
Depreciation, depletion and amortization | $ 593
Restructuring and other charges | 102
Capital expenditures | $ 298

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