Statement of Consolidated Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Sales (C)	$ 7,430	$ 6,640	$ 5,663
Cost of goods sold (exclusive of expenses below)	5,119	4,773	4,103
Selling, general administrative, and other expenses	347	333	288
Research and development expenses	33	36	32
Provision for depreciation and amortization	277	272	265
Restructuring and other charges (D)	21	23	56
Operating income	1,633	1,203	919
Loss on debt redemption (Q)	6	2	2
Interest expense, net (E)	182	218	229
Other expense, net (F)	62	8	82
Income before income taxes	1,383	975	606
Provision for income taxes (H)	228	210	137
Net income	1,155	765	469
Amounts Attributable to Howmet Aerospace Inc. Common Shareholders (J):
Net income	1,153	763	467
Net income	$ 1,153	$ 763	$ 467
Earnings per share:
Basic (in usd per share)	$ 2.83	$ 1.85	$ 1.12
Diluted (in usd per share)	$ 2.81	$ 1.83	$ 1.11
Average Shares Outstanding (I):
Basic (in shares)	408	412	416
Diluted (in shares)	410	416	421