BASIS OF PRESENTATION, RECENT ACCOUNTING PRONOUNCEMENTS AND OTHER (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 2	$ 13	$ 9	$ 39
Business combination adjustments, net	2	(20)	4	(20)
Other, net	3	3	31	10
Total acquisition related and other expenses	7	(4)	44	29
Non-Operating Income, net [Abstract]
Interest income	122	246	457	890
Foreign currency losses, net	(47)	(13)	(127)	(68)
Noncontrolling interests in income	(28)	(35)	(115)	(106)
Other loss, net	(43)	0	(20)	(35)
Total non-operating income, net	$ 4	$ 198	$ 195	$ 681