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Computation of Earnings Per Share (Tables)
9 Months Ended
Feb. 28, 2015
Computation Of Earnings Per Share (Tables) [Abstract]  
Schedule of basic and diluted earnings per common share
   Three Months Ended Nine Months Ended
   2015 2014 2015 2014
Basic earnings per common share:            
Net earnings allocable to common shares(1) $ 579 $ 377 $ 1,799 $ 1,365
Weighted-average common shares   283   303   284   312
Basic earnings per common share $ 2.05 $ 1.24 $ 6.34 $ 4.38
              
Diluted earnings per common share:            
Net earnings allocable to common shares(1) $ 579 $ 377 $ 1,799 $ 1,365
              
Weighted-average common shares   283   303   284   312
Dilutive effect of share-based awards   4   4   4   3
Weighted-average diluted shares   287   307   288   315
Diluted earnings per common share $ 2.01 $ 1.23 $ 6.25 $ 4.34
              
Anti-dilutive options excluded from diluted             
earnings per common share   2.0   0.5   2.1   4.3
              
 (1)Net earnings available to participating securities were immaterial in all periods presented.