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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
Aug. 31, 2017
Aug. 31, 2016
Basic earnings per common share:    
Net earnings allocable to common shares [1] $ 595 $ 714
Weighted-average common shares 268.0 265.0
Basic earnings per common share $ 2.22 $ 2.69
Diluted earnings per common share:    
Net earnings allocable to common shares [1] $ 595 $ 714
Weighted-average common shares 268.0 265.0
Dilutive effect of share-based awards 4.0 4.0
Weighted-average diluted shares 272.0 269.0
Diluted earnings per common share $ 2.19 $ 2.65
Anti-dilutive options excluded from diluted earnings per common share 3.2 5.1
[1] Net earnings available to participating securities were immaterial in all periods presented.