Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Carrying Values and Fair Values of Financial Instruments

The following table summarizes Arconic’s financial liabilities that were not carried at fair value at September 30, 2018 and December 31, 2017:

	September 30, 2018				December 31, 2017
	Carrying value		Fair value		Carrying value		Fair value
Long-term debt, less amount due within one year	$	6,315	$	6,495	$	6,806	$	7,443