STOCKHOLDERS' EQUITY Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
	Mar. 16, 2018 $ / shares	Feb. 28, 2018 USD ($) $ / shares	Feb. 28, 2017 $ / shares	Feb. 28, 2018 USD ($) Tranche $ / shares shares	Feb. 28, 2017 USD ($) $ / shares shares
Stock Repurchases [Abstract]
Approved expansion of stock repurchase program | $		$ 24,000		$ 24,000
Amount available for future repurchases | $		$ 22,800		$ 22,800
Repurchases of common stock (in shares)				131.6	74.6
Repurchased amount | $				$ 6,500	$ 3,000
Repurchased shares that were not settled (in shares)				2.1
Repurchased amount that was not settled | $				$ 105
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share) | $ / shares		$ 0.19	$ 0.15	$ 0.57	$ 0.45
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Restricted stock-based awards granted (in shares)				41.0
Stock options granted (in shares)				77.0
Forfeitures and cancellations (in shares)				16.0
Service-based stock options [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Stock options granted (in shares)				8.0
Expiration date				10 years
Performance-based stock options [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Stock options granted (in shares)				69.0
Number of vesting tranches granted that potentially may vest | Tranche				7
Number of individual vesting tranches requiring attainment of both a performance and a market condition | Tranche				6
Award performance period				5 years
Expiration date				8 years
Award service period for performance-based metrics, minimum				3 years
Award service period for performance-based metrics, maximum				5 years
Award service period for market-based metric				3 years
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract]
Risk-free interest rate				2.14%
Expected life (in years)				7 years
Volatility				22.44%
Dividend yield				1.49%
Subsequent Event [Member]
Dividends on Common Stock [Abstract]
Dividends declared per share of outstanding common stock (in dollars per share) | $ / shares	$ 0.19
Dividend payable date	May 01, 2018
Dividend record date	Apr. 17, 2018