STOCKHOLDERS' EQUITY Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	Jun. 15, 2021	May 31, 2021	May 31, 2020	May 31, 2019	Mar. 10, 2021	May 31, 2017
Stock Repurchases [Abstract]
Additional authorized amount					$ 20,000
Amount available for future repurchases						$ 15,600
Repurchases of common stock (in shares)		329.2	361.0	733.8
Repurchased amount		$ 21,000	$ 19,200	$ 36,000
Repurchased shares that were not settled (in shares)		0.8
Repurchased amount that was not settled		$ 66
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)		$ 1.04	$ 0.96	$ 0.81
Subsequent Event [Member]
Dividends on Common Stock [Abstract]
Dividends declared per share of outstanding common stock (in dollars per share)	$ 0.32
Dividend payable date	Jul. 29, 2021
Dividend record date	Jul. 15, 2021