Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 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):

	Second quarter ended June 30,					Six months ended June 30,
	2021		2020			2021		2020
Net income (loss) attributable to Alcoa Corporation	$	309	$	(197	)	$	484	$	(117	)
Average shares outstanding – basic		187		186			186		186
Effect of dilutive securities:
Stock options		—		—			—		—
Stock units		3		—			3		—
Average shares outstanding – diluted		190		186			189		186