STOCKHOLDERS' EQUITY Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	Jun. 21, 2017	May 31, 2017	May 31, 2016	May 31, 2015
Stock Repurchases [Abstract]
Amount available for future repurchases		$ 5,300
Repurchases of common stock (in shares)		86.0	272.0	194.0
Repurchased amount		$ 3,492	$ 10,439	$ 8,088
Repurchased shares that were not settled (in shares)		0.5
Repurchased amount that was not settled		$ 23
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)		$ 0.64	$ 0.60	$ 0.51
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	Aug. 02, 2017
Dividend record date	Jul. 19, 2017