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, 2021	Aug. 31, 2020
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 1,110	$ 1,243
Weighted-average common shares		266.0	262.0
Basic earnings per common share		$ 4.17	$ 4.75
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 1,110	$ 1,243
Weighted-average common shares		266.0	262.0
Dilutive effect of share-based awards		5.0	1.0
Weighted-average diluted shares		271.0	263.0
Diluted earnings per common share		$ 4.09	$ 4.72
Anti-dilutive options excluded from diluted earnings per common share		2.7	9.0

[1] Net earnings available to participating securities were immaterial in all periods presented.