STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014	May. 31, 2013	Jun. 17, 2015	Sep. 18, 2014
Accumulated Other Comprehensive Loss [Abstract]
Foreign currency translation losses and other, net	$ (851)	$ (81)
Unrealized losses on defined benefit plans, net	(304)	(153)
Unrealized gains on marketable securities, net	124	65
Unrealized gains on cash flow hedges, net	35	5
Total accumulated other comprehensive loss	$ (996)	$ (164)
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)	$ 0.51	$ 0.48	$ 0.30
Dividends declared per share outstanding common stock (in dollars per share)				$ 0.15
Dividend payable date	Jul. 29, 2015
Dividend record date	Jul. 08, 2015
Stock Repurchases (Narrative) [Abstract]
Approved expansion of stock repurchase program					$ 13,000
Amount available for future repurchases	$ 9,200
Repurchases of common stock (in shares)	193.7	280.4	346.1
Repurchased amount	$ 8,088	$ 9,798	$ 10,994
Repurchased shares that were not settled (in shares)	2.2
Repurchased amount that was not settled	$ 95