STOCKHOLDERS' EQUITY Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
	Mar. 14, 2017	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Stock Repurchases [Abstract]
Amount available for future repurchases		$ 5,800		$ 5,800
Repurchases of common stock (in shares)				74.6	222.7
Repurchased amount				$ 3,000	$ 8,400
Repurchased shares that were not settled (in shares)				0.6
Repurchased amount that was not settled				$ 25
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)		$ 0.15	$ 0.15	$ 0.45	$ 0.45
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Stock options granted (in shares)				21.0
Restricted stock-based awards granted (in shares)				52.0
Forfeitures and cancellations (in shares)				10.0
Service-based restricted stock units [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Restricted stock-based awards granted (in shares)				50.0
Performance-based restricted stock units [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Restricted stock-based awards granted (in shares)				2.0
Other stock options [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Expiration date				10 years
Chief Executive Officers and Chief Technology Officer [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Stock options granted (in shares)				7.0
Expiration date				5 years
Subsequent Event [Member]
Dividends on Common Stock [Abstract]
Increase in quarterly cash dividend per share	$ 0.04
Dividends declared per share of outstanding common stock (in dollars per share)	$ 0.19
Dividend payable date	Apr. 26, 2017
Dividend record date	Apr. 12, 2017