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, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 889	$ 314	$ 3,356	$ 1,617
Weighted-average common shares		265.0	261.0	263.0	261.0
Basic earnings (loss) per common share		$ 3.36	$ 1.21	$ 12.75	$ 6.21
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 889	$ 314	$ 3,356	$ 1,617
Weighted-average common shares		265.0	261.0	263.0	261.0
Dilutive effect of share-based awards		5.0	1.0	4.0	1.0
Weighted-average diluted shares		270.0	262.0	267.0	262.0
Diluted earnings (loss) per common share		$ 3.30	$ 1.20	$ 12.55	$ 6.17
Anti-dilutive options excluded from diluted earnings per common share		2.0	11.7	4.1	11.2

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