Statement of Changes in Consolidated Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Capital [Member]	Retained (Deficit) Earnings [Member]	Accumulated Other Comprehensive Loss (Income) [Member]	Non-controlling Interest [Member]
Balance at Dec. 31, 2019	$ 5,886	$ 2	$ 9,639	$ (555)	$ (4,974)	$ 1,774
Net income (loss)	(14)			(170)		156
Other comprehensive income (loss) (G)	(697)				(655)	(42)
Stock-based compensation (N)	25		25
Common stock issued: Compensation plans (N)	1		1
Dividends paid on Alcoa common stock ($0.10 per share) (N)	0
Contributions	24					24
Distributions	(207)					(207)
Other	(2)		(2)
Balance at Dec. 31, 2020	5,016	2	9,663	(725)	(5,629)	1,705
Net income (loss)	570			429		141
Other comprehensive income (loss) (G)	998				1,037	(39)
Stock-based compensation (N)	39		39
Common stock issued: Compensation plans (N)	25		25
Repurchase of common stock (N)	(150)		(150)
Dividends paid on Alcoa common stock ($0.10 per share) (N)	(19)			(19)
Contributions	21					21
Distributions	(215)					(215)
Other	(1)					(1)
Balance at Dec. 31, 2021	6,284	2	9,577	(315)	(4,592)	1,612
Net income (loss)	38			(123)		161
Other comprehensive income (loss) (G)	960				1,053	(93)
Stock-based compensation (N)	40		40
Common stock issued: Compensation plans (N)	3		3
Repurchase of common stock (N)	(500)		(440)	(60)
Dividends paid on Alcoa common stock ($0.10 per share) (N)	(72)			(72)
Contributions	214					214
Distributions	(379)					(379)
Other	1		3			(2)
Balance at Dec. 31, 2022	$ 6,589	$ 2	$ 9,183	$ (570)	$ (3,539)	$ 1,513