Statement of Consolidated Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Sales (E)	$ 2,602	$ 2,851	$ 7,956	$ 9,788
Cost of goods sold (exclusive of expenses below)	2,469	2,668	7,388	7,616
Selling, general administrative, and other expenses	56	44	162	140
Research and development expenses	9	7	25	23
Provision for depreciation, depletion, and amortization	163	149	469	470
Restructuring and other charges, net (D)	22	652	195	702
Interest expense	26	25	79	80
Other expenses (income), net (R)	85	35	145	(185)
Total costs and expenses	2,830	3,580	8,463	8,846
(Loss) income before income taxes	(228)	(729)	(507)	942
(Benefit from) provision for income taxes	(35)	40	39	484
Net (loss) income	(193)	(769)	(546)	458
Less: Net (loss) income attributable to noncontrolling interest	(25)	(23)	(45)	186
NET (LOSS) INCOME ATTRIBUTABLE TO ALCOA CORPORATION	$ (168)	$ (746)	$ (501)	$ 272
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA CORPORATION COMMON SHAREHOLDERS (F):
Basic	$ (0.94)	$ (4.17)	$ (2.81)	$ 1.5
Diluted	$ (0.94)	$ (4.17)	$ (2.81)	$ 1.47