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Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Management evaluated all activity of Arconic 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 noted below: See Note F for details of the final cash contribution the Company made to its pension plan associated with the separation of Alcoa Inc. See Note H for details of the completed ASR. On April 30, 2019, Arconic reached an agreement to sell a small manufacturing facility. The sale is expected to close in the second quarter of 2019 and the Company expects to record a restructuring-related charge of approximately $10 to $15 pre-tax. The charge primarily relates to the non-cash impairment of the net book value of the business.