ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 48	$ 41	$ 45
Stock-based compensation	1	35	3
Professional fees and other, net	3	33	10
Business combination adjustments, net	0	(6)	(16)
Total acquisition related and other expenses	52	103	42
Non-Operating Income, net [Abstract]
Interest income	1,201	802	538
Foreign currency losses, net	(74)	(152)	(110)
Noncontrolling interests in income	(135)	(118)	(116)
Other income (loss), net	245	73	(7)
Total non-operating income, net	$ 1,237	$ 605	$ 305