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Income from Continuing Operations Per Common Share (Tables)
 3 Months Ended
Jun. 30, 2012
Income from Continuing Operations Per Common Share [Abstract]  
Reconciliation of earnings per common share
                 
    Three Months Ended
June 30,		  
    2012     2011  

Basic income from continuing operations per common share:

                

Income from continuing operations

   $ 240     $ 228  

Less: Income from continuing operations allocable to participating securities

     (3 )      (3 ) 
   

 

 

    

 

 

  

Income from continuing operations allocable to common shares

   $ 237     $ 225  
   

 

 

    

 

 

  

Weighted-average common shares outstanding

     465       500  

Basic income from continuing operations per common share

   $ 0.51     $ 0.45  

Diluted income from continuing operations per common share:

                

Income from continuing operations

   $ 240     $ 228  

Less: Income from continuing operations allocable to participating securities

     (3 )      (3 ) 
   

 

 

    

 

 

  

Income from continuing operations allocable to common shares

   $ 237     $ 225  
   

 

 

    

 

 

  

Weighted average shares outstanding and common share equivalents:

                

Weighted average common shares outstanding

     465       500  

Weighted average effect of share-based payment awards

     2       1  
   

 

 

    

 

 

  

Denominator in calculation of diluted income per share

     467       501  
   

 

 

    

 

 

  

Diluted income from continuing operations per common share

   $ 0.51     $ 0.45