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Computation of Earnings Per Share - Schedule of Basic and Diluted Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Basic earnings per common share:        
Net earnings allocable to common shares [1] $ 933 $ 774 $ 1,768 $ 1,369
Weighted-average common shares 262.0 268.0 263.0 268.0
Basic earnings per common share $ 3.56 $ 2.89 $ 6.71 $ 5.12
Diluted earnings per common share:        
Net earnings allocable to common shares [1] $ 933 $ 774 $ 1,768 $ 1,369
Weighted-average common shares 262.0 268.0 263.0 268.0
Dilutive effect of share-based awards 4.0 4.0 5.0 4.0
Weighted-average diluted shares 266.0 272.0 268.0 272.0
Diluted earnings per common share $ 3.51 $ 2.84 $ 6.60 $ 5.03
Anti-dilutive options excluded from diluted earnings per common share 4.0 2.9 3.8 3.0
[1] Net earnings available to participating securities were immaterial in all periods presented.