STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	$ 428	$ 446
Cloud services and license support [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	30	31
Hardware [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	3	3
Services [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	12	14
Sales and marketing [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	71	88
Research and development [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	276	271
General and administrative [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	$ 36	$ 39