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Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	S. 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, with the exception of the Reverse Stock Split as described in Note A and the completion of the Separation Transaction on November 1, 2016 as described in Note R.