STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	May 31, 2016	May 31, 2015	May 31, 2014	Jun. 16, 2016	Mar. 15, 2016
Accumulated Other Comprehensive Loss [Abstract]
Foreign currency translation losses and other, net	$ (778)	$ (851)
Unrealized losses on defined benefit plans, net	(254)	(304)
Unrealized gains on marketable securities, net	196	124
Unrealized gains on cash flow hedges, net	20	35
Total accumulated other comprehensive loss	$ (816)	$ (996)
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)	$ 0.60	$ 0.51	$ 0.48
Dividends declared per share outstanding common stock (in dollars per share)				$ 0.15
Dividend payable date	Jul. 27, 2016
Dividend record date	Jul. 06, 2016
Stock Repurchases (Narrative) [Abstract]
Approved expansion of stock repurchase program					$ 10,000
Amount available for future repurchases	$ 8,800
Repurchases of common stock (in shares)	272.0	194.0	280.0
Repurchased amount	$ 10,439	$ 8,088	$ 9,798
Repurchased shares that were not settled (in shares)	2.3
Repurchased amount that was not settled	$ 94