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Separation Transaction and Discontinued Operations - Summary of Discontinued Operations in Statement of Consolidated Cash Flows (Detail) - Alcoa Corporation - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Depreciation, depletion and amortization | $ 593 | $ 772
Restructuring and other charges | 102 | 981
Capital expenditures | $ 298 | $ 391

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- Definition Amount of capital expenditure attributable to discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 + Details
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