STOCKHOLDERS' EQUITY Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	Jun. 18, 2019	May 31, 2019	May 31, 2018	May 31, 2017
Stock Repurchases [Abstract]
Approved expansion of stock repurchase program		$ 24,000
Amount available for future repurchases				$ 5,800
Repurchases of common stock (in shares)		733.8	238.0	85.6
Repurchased amount		$ 36,000	$ 11,503	$ 3,492
Repurchased shares that were not settled (in shares)		0.8
Repurchased amount that was not settled		$ 40
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)		$ 0.81	$ 0.76	$ 0.64
Subsequent Event [Member]
Dividends on Common Stock [Abstract]
Dividends declared per share of outstanding common stock (in dollars per share)	$ 0.24
Dividend payable date	Jul. 31, 2019
Dividend record date	Jul. 17, 2019