BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 4	$ 14
Business combination adjustments, net	3	(2)
Other, net	18	2
Total acquisition related and other expenses	25	14
Non-Operating Income, net [Abstract]
Interest income	190	348
Foreign currency losses, net	(55)	(34)
Noncontrolling interests in income	(40)	(39)
Other income, net	4	16
Total non-operating income, net	$ 99	$ 291