STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	$ 446	$ 436
Cloud services and license support [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	31	24
Hardware [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	3	3
Services [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	14	13
Sales and marketing [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	88	94
Research and development [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	271	257
General and administrative [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	$ 39	$ 45