Statement of Consolidated Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Sales (E)	$ 2,906	$ 2,684	$ 5,505	$ 5,354
Cost of goods sold (exclusive of expenses below)	2,533	2,515	4,937	4,919
Selling, general administrative, and other expenses	69	52	129	106
Research and development expenses	13	6	24	16
Provision for depreciation, depletion, and amortization	163	153	324	306
Restructuring and other charges, net (D)	18	24	220	173
Interest expense	40	27	67	53
Other (income) expenses, net (P)	(22)	6	37	60
Total costs and expenses	2,814	2,783	5,738	5,633
Consolidated income (loss) before income taxes	92	(99)	(233)	(279)
Provision for income taxes	61	22	43	74
Net income (loss)	31	(121)	(276)	(353)
Less: Net income (loss) attributable to noncontrolling interest	11	(19)	(44)	(20)
NET INCOME (LOSS) ATTRIBUTABLE TO ALCOA CORPORATION	$ 20	$ (102)	$ (232)	$ (333)
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA CORPORATION COMMON SHAREHOLDERS (F):
Basic	$ 0.11	$ (0.57)	$ (1.29)	$ (1.87)
Diluted	$ 0.11	$ (0.57)	$ (1.29)	$ (1.87)