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Income per Share (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Reconciliation of the number of shares used for the basic and diluted income per share calculations
A reconciliation of the number of shares used for the basic and diluted income per share calculations is as follows:

 
 
Three Months Ended
June 30
 
Six Months Ended
June 30
Millions of shares
 
2012
 
2011
 
2012
 
2011
Basic weighted average common shares outstanding
 
924

 
916

 
923

 
915

Dilutive effect of employee stock plans
 
2

 
5

 
3

 
5

Diluted weighted average common shares outstanding
 
926

 
921

 
926

 
920