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Capital Stock (Tables) (Common Class A)
 12 Months Ended
Dec. 31, 2014
Common Class A
  
Authorized Common Stock Repurchase Programs

2014, 2013 and 2012. Shares of Common Stock issued, in treasury and outstanding were:

 

                                                        
                   Shares  
     Shares Issued      Treasury Shares      Outstanding  

Balance at January 1, 2012

      1,996,537,778         (228,641,089 )       1,767,896,689