Investments (Tables)

6 Months Ended

Jun. 30, 2024

Equity Method Investments and Joint Ventures [Abstract]

Summary of Unaudited Financial Information for Alcoa Corporation's Equity Investments

A summary of unaudited financial information for Alcoa Corporation’s equity investments is as follows (amounts represent 100% of investee financial information):

Second quarter ended June 30, 2024	Saudi Arabia Joint Venture			Mining		Energy			Other
Sales	$	804		$	158	$	59		$	114
Cost of goods sold		613			104		25			104
Net income (loss)		102			14		29			(20	)
Equity in net income (loss) of affiliated companies,    before reconciling adjustments		26			6		11			(9	)
Other		(4	)		—		—			12
Alcoa Corporation’s equity in net income of    affiliated companies		22			6		11			3
Second quarter ended June 30, 2023
Sales	$	700		$	172	$	59		$	116
Cost of goods sold		620			101		32			106
Net (loss) income		(99	)		14		22			(33	)
Equity in net (loss) income of affiliated companies,    before reconciling adjustments		(25	)		6		9			(15	)
Other		(3	)		1		1			7
Alcoa Corporation’s equity in net (loss) income of    affiliated companies		(28	)		7		10			(8	)
Six months ended June 30, 2024
Sales	$	1,515		$	273	$	122		$	229
Cost of goods sold		1,212			207		50			209
Net income (loss)		94			9		60			(36	)
Equity in net income (loss) of affiliated companies,    before reconciling adjustments		24			4		23			(17	)
Other		(12	)		—		(1	)		7
Alcoa Corporation’s equity in net income (loss) of    affiliated companies		12			4		22			(10	)
Six months ended June 30, 2023
Sales	$	1,300		$	359	$	117		$	237
Cost of goods sold		1,302			204		59			219
Net (loss) income		(351	)		38		46			(49	)
Equity in net (loss) income of affiliated companies,    before reconciling adjustments		(88	)		17		18			(23	)
Other		(15	)		1		1			—
Alcoa Corporation’s equity in net (loss) income of    affiliated companies		(103	)		18		19			(23	)