Statement of Changes in Consolidated Equity (unaudited) - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Non-controlling Interest [Member]
Balance at Dec. 31, 2021	$ 6,284	$ 2	$ 9,577	$ (315)	$ (4,592)	$ 1,612
Net (loss) income	553			469		84
Other comprehensive (loss) income (G)	(382)				(482)	100
Stock-based compensation	9		9
Net effect of tax withholding for compensation plans and exercise of stock options	2		2
Repurchase of common stock	(75)		(54)	(21)
Dividends paid on Alcoa common stock	(19)			(19)
Contributions	46					46
Distributions	(162)					(162)
Other	1		3			(2)
Balance at Mar. 31, 2022	6,257	2	9,537	114	(5,074)	1,678
Balance at Dec. 31, 2022	6,589	2	9,183	(570)	(3,539)	1,513
Net (loss) income	(232)			(231)		(1)
Other comprehensive (loss) income (G)	(101)				(116)	15
Stock-based compensation	10		10
Net effect of tax withholding for compensation plans and exercise of stock options	(33)		(33)
Dividends paid on Alcoa common stock	(18)			(18)
Contributions	86					86
Distributions	(6)					(6)
Other	1		2			(1)
Balance at Mar. 31, 2023	$ 6,296	$ 2	$ 9,162	$ (819)	$ (3,655)	$ 1,606