Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2020

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,
	2020			2019			2020			2019
Net loss attributable to Alcoa Corporation	$	(197	)	$	(402	)	$	(117	)	$	(601	)
Average shares outstanding – basic		186			186			186			185
Effect of dilutive securities:
Stock options		—			—			—			—
Stock units		—			—			—			—
Average shares outstanding – diluted		186			186			186			185