Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2021

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):

	2021		2020		2019
Average shares outstanding—basic		186		186		185
Effect of dilutive securities:
Stock options		—		—		—
Stock units		4		—		—
Average shares outstanding—diluted		190		186		185