STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	$ 361	$ 427	$ 1,204	$ 1,259
Cloud services and license support [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	22	26	83	74
Hardware [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	3	2	8	7
Services [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	14	12	42	37
Sales and marketing [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	67	89	192	278
Research and development [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	238	254	781	732
General and administrative [Member]
Stock-Based Compensation Expense and Stock Awards [Abstract]
Total stock-based compensation	$ 17	$ 44	$ 98	$ 131