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, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Basic earnings per common share:
Net earnings allocable to common shares	[1]	$ 739	$ 898	$ 1,533	$ 1,975
Weighted-average common shares		242.0	250.0	243.0	251.0
Basic earnings per common share		$ 3.06	$ 3.59	$ 6.3	$ 7.88
Diluted earnings per common share:
Net earnings allocable to common shares	[1]	$ 739	$ 898	$ 1,533	$ 1,975
Weighted-average common shares		242.0	250.0	243.0	251.0
Dilutive effect of share-based awards		2.0	3.0	3.0	3.0
Weighted-average diluted shares		244.0	253.0	246.0	254.0
Diluted earnings per common share		$ 3.03	$ 3.55	$ 6.24	$ 7.79
Anti-dilutive options excluded from diluted earnings per common share		4.0	6.3	4.2	6.3

[1] Net earnings available to participating securities were $2 million and $2 million for the three-month periods ended November 30, 2024 and 2023, respectively, and $2 million and $3 million for the six-month periods ended November 30, 2024 and 2023, respectively.