Investments (Tables)

6 Months Ended

Jun. 30, 2023

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, 2023	Saudi Arabia Joint Venture			Mining			Energy			Other
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	)
Second quarter ended June 30, 2022
Sales	$	1,016		$	191		$	65		$	125
Cost of goods sold		712			123			23			115
Net income (loss)		156			32			29			(30	)
Equity in net income (loss) of affiliated companies,    before reconciling adjustments		39			12			12			(15	)
Other		(4	)		(2	)		(2	)		19
Alcoa Corporation’s equity in net income of    affiliated companies		35			10			10			4
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	)
Six months ended June 30, 2022
Sales	$	1,913		$	422		$	127		$	242
Cost of goods sold		1,328			269			53			222
Net income (loss)		311			81			52			(58	)
Equity in net income (loss) of affiliated companies,    before reconciling adjustments		78			26			21			(28	)
Other		(4	)		(2	)		(1	)		15
Alcoa Corporation’s equity in net income (loss) of    affiliated companies		74			24			20			(13	)