Statement of Consolidated Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Sales (C)	$ 6,640	$ 5,663	$ 4,972
Cost of goods sold (exclusive of expenses below)	4,773	4,103	3,596
Selling, general administrative, and other expenses	333	288	251
Research and development expenses	36	32	17
Provision for depreciation and amortization	272	265	270
Restructuring and other charges (D)	23	56	90
Operating income	1,203	919	748
Loss on debt redemption (Q)	2	2	146
Interest expense, net (E)	218	229	259
Other expense, net (F)	8	82	19
Income before income taxes	975	606	324
Provision for income taxes (H)	210	137	66
Net income	765	469	258
Amounts Attributable to Howmet Aerospace Inc. Common Shareholders (J):
Net income	763	467	256
Net income	$ 763	$ 467	$ 256
Earnings per share:
Basic (in usd per share)	$ 1.85	$ 1.12	$ 0.60
Diluted (in usd per share)	$ 1.83	$ 1.11	$ 0.59
Average Shares Outstanding (I):
Basic (in shares)	412	416	430
Diluted (in shares)	416	421	435