Statement of Consolidated Operations (unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Sales (C)	$ 1,880	$ 1,648	$ 3,704	$ 3,251
Cost of goods sold (exclusive of expenses below)	1,287	1,196	2,577	2,360
Selling, general administrative, and other expenses	97	88	185	163
Research and development expenses	7	9	17	18
Provision for depreciation and amortization	69	67	136	136
Restructuring and other charges (D)	22	3	22	4
Operating income	398	285	767	570
Loss on debt redemption (N)	0	0	0	1
Interest expense, net	49	55	98	112
Other expense (income), net (F)	15	(13)	32	(6)
Income before income taxes	334	243	637	463
Provision for income taxes (G)	68	50	128	122
Net income	266	193	509	341
Amounts Attributable to Howmet Aerospace Common Shareholders (H):
Net income, Basic	266	193	508	340
Net income, Diluted	$ 266	$ 193	$ 508	$ 340
Earnings per share:
Basic (in usd per share)	$ 0.65	$ 0.47	$ 1.24	$ 0.82
Diluted (in usd per share)	$ 0.65	$ 0.46	$ 1.23	$ 0.81
Average Shares Outstanding (H):
Basic (in shares)	408	413	409	413
Diluted (in shares)	411	417	411	417