Statement of Consolidated Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Sales (E)	$ 2,851	$ 3,109	$ 9,788	$ 8,812
Cost of goods sold (exclusive of expenses below)	2,668	2,322	7,616	6,770
Selling, general administrative, and other expenses	44	53	140	159
Research and development expenses	7	8	23	21
Provision for depreciation, depletion, and amortization	149	156	470	499
Restructuring and other charges, net (D)	652	33	702	73
Interest expense	25	58	80	167
Other expense (income), net (Q)	35	(18)	(185)	(147)
Total costs and expenses	3,580	2,612	8,846	7,542
(Loss) income before income taxes	(729)	497	942	1,270
Provision for income taxes	40	127	484	331
Net (loss) income	(769)	370	458	939
Less: Net (loss) income attributable to noncontrolling interest	(23)	33	186	118
NET (LOSS) INCOME ATTRIBUTABLE TO ALCOA CORPORATION	$ (746)	$ 337	$ 272	$ 821
EARNINGS PER SHARE ATTRIBUTABLE TO ALCOA CORPORATION COMMON SHAREHOLDERS (F):
Basic	$ (4.17)	$ 1.80	$ 1.50	$ 4.40
Diluted	$ (4.17)	$ 1.76	$ 1.47	$ 4.32