Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

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

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

	First quarter ended March 31,
	2021		2020
Net income attributable to Alcoa Corporation	$	175	$	80
Average shares outstanding – basic		186		186
Effect of dilutive securities:
Stock options		—		—
Stock units		3		1
Average shares outstanding – diluted		189		187