Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share	$ 1.38	$ 1.26	$ 4.14	$ 2.52
Other comprehensive (loss)/income, net of tax benefit/(expense)	$ 2	$ (14)	$ (1)	$ (10)
Purchase of treasury stock	3.7	2.0	7.1	3.9
Employee incentive plans and other, shares issued	0.2	0.4	2.4	1.5