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Computation of Earnings Per Share (Tables)
3 Months Ended
Aug. 31, 2016
Computation Of Earnings Per Share (Tables) [Abstract]  
Schedule of basic and diluted earnings per common share
   2016 2015
Basic earnings per common share:     
Net earnings allocable to common shares(1)$ 714 $ 691
Weighted-average common shares  265   282
Basic earnings per common share$ 2.69 $ 2.45
        
Diluted earnings per common share:     
Net earnings allocable to common shares(1)$ 714 $ 691
        
Weighted-average common shares  265   282
Dilutive effect of share-based awards  4   4
Weighted-average diluted shares  269   286
Diluted earnings per common share$ 2.65 $ 2.42
        
Anti-dilutive options excluded from diluted      
 earnings per common share 5.1  3.5

(1) Net earnings available to participating securities were immaterial in all periods presented.