FAIR VALUE MEASUREMENTS Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Nov. 30, 2016	May 31, 2016
Marketable security investments maturity information [Abstract]
Maturity of marketable security investments	As of November 30, 2016 and May 31, 2016, approximately 39% and 28%, respectively, of our marketable securities investments mature within one year and 61% and 72%, respectively, mature within one to six years.
Percentage of marketable securities investments mature within one year	39.00%	28.00%
Percentage of marketable securities investments mature within one to six years	61.00%	72.00%
Short and Long Term Debt [Abstract]
Short-term borrowings	$ 3,838	$ 3,750
Senior notes	54,200	40,100
Fair Value Measurements Using Input Types Level 2 [Member]
Liabilities [Abstract]
Total debt fair value	$ 55,600	$ 43,200