ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 5	$ 12	$ 49
Business combination adjustments, net	4	(7)	(21)
Other, net	129	51	16
Total acquisition related and other expenses	138	56	44
Non-Operating Income, net [Abstract]
Interest income	101	527	1,092
Foreign currency losses, net	(112)	(185)	(111)
Noncontrolling interests in income	(180)	(164)	(152)
Other, net	473	(16)	(14)
Total non-operating income, net	$ 282	$ 162	$ 815