Consolidated Statements of Changes in Common Stockholders' Investment (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2020
Statement of Stockholders' Equity [Abstract]
Other comprehensive gain (loss), tax	$ (19)	$ 10	$ (43)
Purchase of treasury stock	8,900,000		20,000.00
Cash dividends declared, per share	$ 3.00	$ 2.60	$ 2.60
Employee incentive plans and other, shares issued	1,400,000	5,400,000	1,000,000.0