BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Acquisition Related and Other Expenses [Abstract]
Transitional and other employee related costs	$ 8	$ 8	$ 16	$ 33
Stock-based compensation	11	0	11	3
Professional fees and other, net	22	4	27	9
Business combination adjustments, net	(1)	(19)	0	(20)
Total acquisition related and other expenses	40	(7)	54	25
Non-Operating Income, net [Abstract]
Interest income	204	123	381	240
Foreign currency losses, net	(69)	(28)	(82)	(53)
Noncontrolling interests in income	(41)	(29)	(76)	(59)
Other income (loss), net	5	18	24	(14)
Total non-operating income, net	$ 99	$ 84	$ 247	$ 114