Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted EPS Attributable to Alcoa Corporation Common Shareholders

The share information used to compute basic and diluted EPS attributable to Alcoa Corporation common shareholders was as follows (shares in millions):

	Third quarter ended September 30,						Nine months ended September 30,
	2023			2022			2023			2022
Net (loss) income attributable to Alcoa Corporation	$	(168	)	$	(746	)	$	(501	)	$	272
Average shares outstanding – basic		178			179			178			182
Effect of dilutive securities:
Stock options		—			—			—			—
Stock units		—			—			—			4
Average shares outstanding – diluted		178			179			178			186