Condensed Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Aug. 31, 2024	Aug. 31, 2023
Statement of Stockholders' Equity [Abstract]
Cash dividends declared, per share	$ 2.76	$ 1.26
Other comprehensive income/(loss), net of tax (expense)/benefit	$ (3)	$ 4
Purchase of treasury stock	3.4	2.0
Employee incentive plans and other, shares issued	2.2	1.1