STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 2019
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	$ 488	$ 397	$ 916	$ 843
Cloud services and license support [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	36	30	66	61
Hardware [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	3	3	6	6
Services [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	14	14	26	28
Sales and marketing [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	80	37	151	125
Research and development [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	314	272	590	543
General and administrative [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	$ 41	$ 41	$ 77	$ 80