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, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 1,042	$ 1,224	$ 2,152	$ 2,466
Weighted-average common shares		265.0	264.0	265.0	263.0
Basic earnings per common share		$ 3.94	$ 4.64	$ 8.11	$ 9.40
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 1,042	$ 1,224	$ 2,152	$ 2,466
Weighted-average common shares		265.0	264.0	265.0	263.0
Dilutive effect of share-based awards		3.0	5.0	5.0	3.0
Weighted-average diluted shares		268.0	269.0	270.0	266.0
Diluted earnings per common share		$ 3.88	$ 4.55	$ 7.97	$ 9.26
Anti-dilutive options excluded from diluted earnings per common share		4.2	1.3	3.5	5.1

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