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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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 (in millions):

 

 

 

2018

 

 

2017

 

 

2016

 

Average shares outstanding—basic

 

 

186

 

 

 

184

 

 

 

183

 

Effect of dilutive securities:

 

 

 

 

 

 

 

 

 

 

 

 

Stock options

 

 

1

 

 

 

1

 

 

 

—

 

Stock units

 

 

2

 

 

 

2

 

 

 

—

 

Average shares outstanding—diluted

 

 

189

 

 

 

187

 

 

 

183