Statement of Consolidated Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Sales (D)	$ 2,313	$ 1,942
Cost of goods sold (exclusive of expenses below)	1,459	1,290
Selling, general administrative, and other expenses	111	85
Research and development expenses	9	8
Provision for depreciation and amortization	74	69
Restructuring and other credits (E)	(93)	(4)
Operating income	753	494
Interest expense, net	43	39
Other expense, net (G)	2	9
Income before income taxes	708	446
Provision for income taxes (H)	128	102
Net income	580	344
Amounts Attributable to Howmet Aerospace Common Shareholders (I):
Net income, Basic	580	343
Net income, Diluted	$ 580	$ 343
Earnings per share:
Basic (in usd per share)	$ 1.45	$ 0.85
Diluted (in usd per share)	$ 1.44	$ 0.84
Average Shares Outstanding (I):
Basic (in shares)	401	405
Diluted (in shares)	403	407