Statement of Consolidated Operations (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Sales (E)	$ 2,670	$ 3,293
Cost of goods sold (exclusive of expenses below)	2,404	2,181
Selling, general administrative, and other expenses	54	44
Research and development expenses	10	9
Provision for depreciation, depletion, and amortization	153	160
Restructuring and other charges, net (D)	149	125
Interest expense	26	25
Other expenses (income), net (Q)	54	(14)
Total costs and expenses	2,850	2,530
(Loss) income before income taxes	(180)	763
Provision for income taxes	52	210
Net (loss) income	(232)	553
Less: Net (loss) income attributable to noncontrolling interest	(1)	84
NET (LOSS) INCOME ATTRIBUTABLE TO ALCOA CORPORATION	$ (231)	$ 469
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA CORPORATION COMMON SHAREHOLDERS (F):
Basic	$ (1.30)	$ 2.54
Diluted	$ (1.30)	$ 2.49