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Computation of Earnings Per Share (Tables)
 9 Months Ended
Feb. 29, 2016
Computation Of Earnings Per Share (Tables) [Abstract]  
Schedule of basic and diluted earnings per common share
   Three Months Ended Nine Months Ended
   2016 2015 2016 2015
Basic earnings per common share:            
Net earnings allocable to common shares(1) $ 506 $ 626 $ 1,888 $ 1,941
Weighted-average common shares   272   283   278   284
Basic earnings per common share $ 1.86 $ 2.21 $ 6.79 $ 6.85
              
Diluted earnings per common share:            
Net earnings allocable to common shares(1) $ 506 $ 626 $ 1,888 $ 1,941
              
Weighted-average common shares   272   283   278   284
Dilutive effect of share-based awards   3   4   3   4
Weighted-average diluted shares   275   287   281   288
Diluted earnings per common share $ 1.84 $ 2.18 $ 6.71 $ 6.75
              
Anti-dilutive options excluded from diluted             
earnings per common share   4.8   2.0   4.0   2.1

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