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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]  
Reconciliation Of Information Used To Compute Basic And Diluted EPS
     2011      2010      2009  

Income (loss) from continuing operations attributable to Alcoa common shareholders

    $ 614       $ 262       $ (985 ) 

Less: preferred stock dividends declared

      2         2         2   
  

 

 

     

 

 

     

 

 

  

Income (loss) from continuing operations available to common equity

      612         260         (987 ) 

Less: dividends and undistributed earnings allocated to participating securities

      1         1         —     
  

 

 

     

 

 

     

 

 

  

Income (loss) from continuing operations available to Alcoa common shareholders—basic

      611         259         (987 ) 

Add: interest expense related to convertible notes

      30         —           —     
  

 

 

     

 

 

     

 

 

  

Income (loss) from continuing operations available to Alcoa common shareholders—diluted

    $ 641       $ 259       $ (987 ) 
  

 

 

     

 

 

     

 

 

  

Average shares outstanding—basic

      1,061         1,018         935   

Effect of dilutive securities:

         

Stock options

      7         6         —     

Stock and performance awards

      4         1         —     

Convertible notes

      89         —           —     
  

 

 

     

 

 

     

 

 

  

Average shares outstanding—diluted

      1,161         1,025         935