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Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Basic earnings per common share:        
Net earnings allocable to common shares $ 700 $ 690 $ 1,414 $ 1,382
Weighted-average common shares 266.0 279.0 266.0 281.0
Basic earnings per common share $ 2.63 $ 2.47 $ 5.32 $ 4.92
Diluted earnings per common share:        
Net earnings allocable to common shares $ 700 $ 690 $ 1,414 $ 1,382
Weighted-average common shares 266.0 279.0 266.0 281.0
Dilutive effect of share-based awards 4.0 4.0 4.0 3.0
Weighted-average diluted shares 270.0 283.0 270.0 284.0
Diluted earnings per common share $ 2.59 $ 2.44 $ 5.24 $ 4.86
Anti-dilutive options excluded from diluted earnings per common share 5.1 3.7 5.1 3.6