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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 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 D for details of a curtailment of operations at a plant in the GRP segment. See Note H for details of the August 2019 ASR that was settled in October. See Note O for details on the maturity of Convertible Notes. See Note Q for details on an agreement reached to sell a hard alloy extrusions plant.