Statement of Consolidated Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Sales (E)	$ 2,684	$ 3,644	$ 5,354	$ 6,937
Cost of goods sold (exclusive of expenses below)	2,515	2,767	4,919	4,948
Selling, general administrative, and other expenses	52	52	106	96
Research and development expenses	6	7	16	16
Provision for depreciation, depletion, and amortization	153	161	306	321
Restructuring and other charges, net (D)	24	(75)	173	50
Interest expense	27	30	53	55
Other expenses (income), net (R)	6	(206)	60	(220)
Total costs and expenses	2,783	2,736	5,633	5,266
(Loss) income before income taxes	(99)	908	(279)	1,671
Provision for income taxes	22	234	74	444
Net (loss) income	(121)	674	(353)	1,227
Less: Net (loss) income attributable to noncontrolling interest	(19)	125	(20)	209
NET (LOSS) INCOME ATTRIBUTABLE TO ALCOA CORPORATION	$ (102)	$ 549	$ (333)	$ 1,018
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA CORPORATION COMMON SHAREHOLDERS (F):
Basic	$ (0.57)	$ 3.01	$ (1.87)	$ 5.55
Diluted	$ (0.57)	$ 2.95	$ (1.87)	$ 5.44