Segment and Geographic Area Information - Schedule of Segment Operating Profit to Consolidated Net Income (loss) Income Attributable to Arconic (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total Segment Adjusted EBITDA	$ 1,203	$ 919	$ 748
Loss on debt redemption	(2)	(2)	(146)
Interest expense, net	(218)	(229)	(259)
Other expense, net (F)	(8)	(82)	(19)
Income before income taxes	975	606	324
Total segment sales
Segment Reporting Information [Line Items]
Total Segment Adjusted EBITDA	1,587	1,352	1,200
Segment provision for depreciation and amortization	(262)	(258)	(261)
Restructuring and other charges
Segment Reporting Information [Line Items]
Total Segment Adjusted EBITDA	(23)	(56)	(90)
Corporate expense
Segment Reporting Information [Line Items]
Total Segment Adjusted EBITDA	$ (99)	$ (119)	$ (101)