Statement of Consolidated Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Sales (E)	$ 10,551	$ 12,451	$ 12,152
Cost of goods sold (exclusive of expenses below)	9,813	10,212	9,153
Selling, general administrative, and other expenses	226	204	227
Research and development expenses	39	32	31
Provision for depreciation, depletion, and amortization	632	617	664
Restructuring and other charges, net (D)	184	696	1,128
Interest expense (U)	107	106	195
Other expenses (income), net (U)	134	(118)	(445)
Total costs and expenses	11,135	11,749	10,953
(Loss) income before income taxes	(584)	702	1,199
Provision for income taxes (Q)	189	664	629
Net (loss) income	(773)	38	570
Less: Net (loss) income attributable to noncontrolling interest	(122)	161	141
Net (loss) income attributable to Alcoa Corporation	$ (651)	$ (123)	$ 429
Earnings per share attributable to Alcoa Corporation common shareholders (F):
Basic	$ (3.65)	$ (0.68)	$ 2.30
Diluted	$ (3.65)	$ (0.68)	$ 2.26