Statement of Consolidated Operations (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Sales (E)	$ 2,599	$ 2,670
Cost of goods sold (exclusive of expenses below)	2,404	2,404
Selling, general administrative, and other expenses	60	54
Research and development expenses	11	10
Provision for depreciation, depletion, and amortization	161	153
Restructuring and other charges, net (D)	202	149
Interest expense	27	26
Other expenses, net (P)	59	54
Total costs and expenses	2,924	2,850
Consolidated loss before income taxes	(325)	(180)
(Benefit from) provision for income taxes	(18)	52
Net loss	(307)	(232)
Less: Net loss attributable to noncontrolling interest	(55)	(1)
NET LOSS ATTRIBUTABLE TO ALCOA CORPORATION	$ (252)	$ (231)
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA CORPORATION COMMON SHAREHOLDERS (F):
Basic	$ (1.41)	$ (1.3)
Diluted	$ (1.41)	$ (1.3)