BASIS OF PRESENTATION AND RECENT ACCOUNTING PRONOUNCEMENTS Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Restricted Cash And Cash Equivalents [Abstract]
Restricted cash and cash equivalent description	Restricted cash that was included within cash and cash equivalents as presented within our condensed consolidated balance sheets as of August 31, 2017 and May 31, 2017 and our condensed consolidated statements of cash flows for the three months ended August 31, 2017 and 2016 was nominal.
Sales of Financing Receivables [Narrative] [Abstract]
Sales of financing receivables	$ 818	$ 898