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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Z. Subsequent Events Management evaluated all activity of Alcoa and concluded that no subsequent events have occurred that would require recognition in the Consolidated Financial Statements or disclosure in the Notes to the Consolidated Financial Statements, except as described below. On January 26, 2016, the European Court of Justice issued a decision in connection with legal proceedings related to whether the extension of energy tariffs by Italy to Alcoa constituted unlawful state aid (see European Commission Matters in Note N). In addition, a separate but related matter was also updated as a result of the aforementioned decision (see Other Matters in the Litigation section of Note N).