Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2022
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share	$ 3.78	$ 5.86	$ 3
Other comprehensive loss, tax	$ 4	$ 27	$ 19
Purchase of treasury stock	9.8	9.2	8.9
Employee incentive plans and other, shares issued	3.1	1.9	1.4