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, 2020	Aug. 31, 2019
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 1,243	$ 744
Weighted-average common shares		262.0	260.0
Basic earnings (loss) per common share		$ 4.75	$ 2.86
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 1,243	$ 744
Weighted-average common shares		262.0	260.0
Dilutive effect of share-based awards		1.0	2.0
Weighted-average diluted shares		263.0	262.0
Diluted earnings (loss) per common share		$ 4.72	$ 2.84
Anti-dilutive options excluded from diluted earnings per common share		9.0	10.9

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