BASIS OF PRESENTATION, RECENT ACCOUNTING PRONOUNCEMENTS AND OTHER (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 2	$ 1	$ 4	$ 3
Business combination adjustments, net	1	0	4	1
Litigation related charges and other, net	4,664	75	4,679	91
Total acquisition related and other expenses	4,667	76	4,687	95
Non-Operating Expenses, net [Abstract]
Interest income	21	27	40	58
Foreign currency losses, net	(46)	(16)	(81)	(66)
Noncontrolling interests in income	(42)	(43)	(89)	(81)
Other, net	74	21	96	76
Total non-operating income (expenses), net	$ 7	$ (11)	$ (34)	$ (13)