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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
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):

 

     Third quarter ended
September 30,		      Nine months ended
September 30,		  
     2017      2016      2017      2016  

Net income (loss) attributable to Alcoa Corporation

    $ 113      $ (10 )     $ 413      $ (275 ) 
  

 

 

     

 

 

     

 

 

     

 

 

  

Average shares outstanding – basic

      185        182        184        182  

Effect of dilutive securities:

            

Stock options

      1        —          1        —    

Stock and performance awards

      1        —          2        —    
  

 

 

     

 

 

     

 

 

     

 

 

  

Average shares outstanding – diluted

      187        182        187        182