ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 12	$ 49	$ 48
Stock-based compensation	0	0	1
Business combination adjustments, net	(7)	(21)	0
Other, net	51	16	3
Total acquisition related and other expenses	56	44	52
Non-Operating Income, net [Abstract]
Interest income	527	1,092	1,203
Foreign currency losses, net	(185)	(111)	(74)
Noncontrolling interests in income	(164)	(152)	(135)
Other income (loss), net	(16)	(14)	191
Total non-operating income, net	$ 162	$ 815	$ 1,185