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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Authorized Common Stock Repurchase Programs

Shares of Common Stock issued, in treasury and outstanding were:

 

                                                        
                   Shares  
   Shares Issued      Treasury Shares      Outstanding  

Balance at January 1, 2015

      1,996,537,778        (332,896,779 )       1,663,640,999  

Shares repurchased

      –        (91,875,878 )       (91,875,878 ) 

Exercise of stock options and issuance of
other stock awards

      –        8,268,033        8,268,033  
  

 

 

     

 

 

     

 

 

  

Balance at December 31, 2015

      1,996,537,778        (416,504,624 )       1,580,033,154  
  

 

 

     

 

 

     

 

 

  

Shares repurchased

      –        (61,972,713 )       (61,972,713 ) 

Exercise of stock options and issuance of
other stock awards

      –        10,305,100        10,305,100  
  

 

 

     

 

 

     

 

 

  

Balance at December 31, 2016

      1,996,537,778        (468,172,237 )       1,528,365,541  
  

 

 

     

 

 

     

 

 

  

Shares repurchased

      –        (50,598,902 )       (50,598,902 ) 

Exercise of stock options and issuance of
other stock awards

      –        10,369,445        10,369,445  
  

 

 

     

 

 

     

 

 

  

Balance at December 31, 2017

      1,996,537,778        (508,401,694 )       1,488,136,084