STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	$ 427	$ 389	$ 1,259	$ 1,211
Cloud services and license support [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	26	21	74	58
Hardware [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	2	2	7	8
Services [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	12	13	37	41
Sales and marketing [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	89	87	278	275
Research and development [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	254	221	732	693
General and administrative [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	44	45	131	135
Acquisition related and other [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	$ 0	$ 0	$ 0	$ 1