STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	$ 479	$ 361	$ 1,395	$ 1,204
Cloud services and license support [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	33	22	99	83
Hardware [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	2	3	8	8
Services [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	15	14	41	42
Sales and marketing [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	82	67	233	192
Research and development [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	307	238	897	781
General and administrative [Member]
Stock-based compensation expense and valuations of stock awards [Abstract]
Total stock-based compensation	$ 40	$ 17	$ 117	$ 98