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		9 Months Ended
		Feb. 28, 2022	Feb. 28, 2021	Feb. 28, 2022	Feb. 28, 2021
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 1,110	$ 889	$ 3,262	$ 3,356
Weighted-average common shares		261.0	265.0	264.0	263.0
Basic earnings per common share		$ 4.26	$ 3.36	$ 12.36	$ 12.75
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 1,110	$ 889	$ 3,262	$ 3,356
Weighted-average common shares		261.0	265.0	264.0	263.0
Dilutive effect of share-based awards		4.0	5.0	4.0	4.0
Weighted-average diluted shares		265.0	270.0	268.0	267.0
Diluted earnings per common share		$ 4.20	$ 3.30	$ 12.17	$ 12.55
Anti-dilutive options excluded from diluted earnings per common share		4.4	2.0	3.8	4.1

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