STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	$ 403	$ 319
Cloud SaaS [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	9	5
Cloud PaaS and IaaS [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	2	1
Software license updates and product support [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	7	6
Hardware [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	3	3
Services business [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	14	8
Sales and marketing [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	89	63
Research and development [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	234	195
General and administrative [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	44	38
Acquisition related and other [Member]
Stock-Based Compensation Expense and Valuations of Stock Awards [Abstract]
Total stock-based compensation	$ 1	$ 0