Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2023	Feb. 28, 2022
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share	$ 1.15	$ 0.75	$ 4.60	$ 3.00
Other comprehensive income, tax benefit	$ (5)	$ (2)	$ 23	$ 3
Purchase of treasury stock	1,300,000	6,100,000	9,200,000	8,900,000
Employee incentive plans and other, shares issued	200,000	300,000	1,000,000.0	1,100,000