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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	P. Subsequent Events – Management evaluated all activity of Alcoa Corporation 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 July 6, 2018, Alcoa Corporation, along with Arconic, received notice of a court decision related to an outstanding appeal of an income tax matter associated with a former Spanish consolidated tax group previously owned by ParentCo (see “Spain” in the Tax section of Note N).