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Computation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Basic earnings per common share:        
Net earnings allocable to common shares [1] $ 506 $ 626 $ 1,888 $ 1,941
Weighted-average common shares 272.0 283.0 278.0 284.0
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 272.0 283.0 278.0 284.0
Dilutive effect of share-based awards 3.0 4.0 3.0 4.0
Weighted-average diluted shares 275.0 287.0 281.0 288.0
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.