STOCKHOLDERS' EQUITY Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
	Dec. 14, 2016	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Stock Repurchases [Abstract]
Amount available for future repurchases		$ 6,300		$ 6,300
Repurchases of common stock (in shares)				62.0	162.1
Repurchased amount				$ 2,500	$ 6,200
Repurchased shares that were not settled (in shares)				0.6
Repurchased amount that was not settled				$ 24
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)		$ 0.15	$ 0.15	$ 0.30	$ 0.30
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Stock options granted (in shares)				21.0
Restricted stock-based awards granted (in shares)				49.0
Forfeitures and cancellations (in shares)				6.0
Service-based restricted stock units [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Restricted stock-based awards granted (in shares)				47.0
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]
Dividends declared per share of outstanding common stock (in dollars per share)	$ 0.15
Dividend payable date	Jan. 26, 2017
Dividend record date	Jan. 05, 2017