BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 9	$ 8
Stock-based compensation	1	0
Professional fees and other, net	3	5
Business combination adjustments, net	(1)	1
Total acquisition related and other expenses	12	14
Non-Operating Income, net [Abstract]
Interest income	257	177
Foreign currency losses, net	(4)	(13)
Noncontrolling interests in income	(47)	(35)
Other income (loss), net	27	19
Total non-operating income, net	$ 233	$ 148