Computation of Earnings Per Share - Schedule of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		May 31, 2021	May 31, 2020	May 31, 2019
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 5,220	$ 1,284	$ 539
Weighted-average common shares		264.0	261.0	262.0
Basic earnings (loss) per common share		$ 19.79	$ 4.92	$ 2.06
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 5,221	$ 1,284	$ 539
Weighted-average common shares		264.0	261.0	262.0
Dilutive effect of share-based awards		4.0	1.0	3.0
Weighted-average diluted shares		268.0	262.0	265.0
Diluted earnings (loss) per common share		$ 19.45	$ 4.90	$ 2.03
Anti-dilutive options excluded from diluted earnings per common share		3.5	11.7	5.4

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