Statement of Consolidated Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Sales (C)	$ 1,835	$ 1,658	$ 5,539	$ 4,909
Cost of goods sold (exclusive of expenses below)	1,253	1,183	3,830	3,543
Selling, general administrative, and other expenses	85	87	270	250
Research and development expenses	9	9	26	27
Provision for depreciation and amortization	68	68	204	204
Restructuring and other (credits) charges (D)	(1)	4	21	8
Operating income	421	307	1,188	877
Loss on debt redemption (N)	6	0	6	1
Interest expense, net	44	54	142	166
Other expense, net (F)	17	11	49	5
Income before income taxes	354	242	991	705
Provision for income taxes (G)	22	54	150	176
Net income	332	188	841	529
Amounts Attributable to Howmet Aerospace Common Shareholders (H):
Net income, Basic	331	187	839	527
Net income, Diluted	$ 331	$ 187	$ 839	$ 527
Earnings per share:
Basic (in usd per share)	$ 0.81	$ 0.45	$ 2.06	$ 1.28
Diluted (in usd per share)	$ 0.81	$ 0.45	$ 2.04	$ 1.27
Average Shares Outstanding (H):
Basic (in shares)	408	412	408	412
Diluted (in shares)	410	415	411	417