Statement of Consolidated Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Sales (D)	$ 2,547	$ 2,053	$ 4,860	$ 3,995
Cost of goods sold (exclusive of expenses below)	1,596	1,365	3,055	2,655
Selling, general administrative, and other expenses	148	89	259	174
Research and development expenses	8	9	17	17
Provision for depreciation and amortization	84	69	158	138
Restructuring and other credits (E)	0	0	(93)	(4)
Operating income	711	521	1,464	1,015
Interest expense, net	51	38	94	77
Other expense, net (G)	11	14	13	23
Income before income taxes	649	469	1,357	915
Provision for income taxes (H)	115	62	243	164
Net income	534	407	1,114	751
Amounts Attributable to Howmet Aerospace Common Shareholders (I):
Net income, Basic	534	407	1,114	750
Net income, Diluted	$ 534	$ 407	$ 1,114	$ 750
Earnings per share:
Basic (in usd per share)	$ 1.33	$ 1.01	$ 2.78	$ 1.85
Diluted (in usd per share)	$ 1.33	$ 1.00	$ 2.77	$ 1.84
Average Shares Outstanding (I):
Basic (in shares)	400	404	400	404
Diluted (in shares)	402	406	402	407