BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 8	$ 24
Stock-based compensation		3
Professional fees and other, net	5	4
Business combination adjustments, net	1
Total acquisition related and other expenses	14	31
Non-Operating Income, net [Abstract]
Interest income	177	117
Foreign currency losses, net	(13)	(25)
Noncontrolling interests in income	(35)	(30)
Other income (loss), net	19	(32)
Total non-operating income, net	$ 148	$ 30