Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share	$ 1.26	$ 1.15	$ 3.78	$ 4.6
Other comprehensive (loss) income, net of tax benefit (expense)	$ 2	$ (5)	$ (8)	$ 23
Purchase of treasury stock	4.1	1.3	8.0	9.2
Employee incentive plans and other, shares issued	0.3	0.2	1.8	1.0