STOCKHOLDERS' EQUITY Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	Jun. 19, 2018	May 31, 2018	May 31, 2017	May 31, 2016
Stock Repurchases [Abstract]
Approved expansion of stock repurchase program		$ 24,000
Amount available for future repurchases			$ 17,800
Repurchases of common stock (in shares)		238.0	85.6	271.9
Repurchased amount		$ 11,503	$ 3,492	$ 10,439
Repurchased shares that were not settled (in shares)		3.8
Repurchased amount that was not settled		$ 180
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)		$ 0.76	$ 0.64	$ 0.60
Subsequent Event [Member]
Dividends on Common Stock [Abstract]
Dividends declared per share of outstanding common stock (in dollars per share)	$ 0.19
Dividend payable date	Jul. 31, 2018
Dividend record date	Jul. 17, 2018