SUMMARY OF TOTAL REVENUES BY GEOGRAPHIC REGION (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Disaggregation of Revenue [Line Items]
Total revenues		$ 9,796	$ 9,614	$ 28,629	$ 28,369
Americas [Member]
Disaggregation of Revenue [Line Items]
Total revenues		5,363	5,266	15,817	15,671
EMEA [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[1]	2,835	2,781	8,083	8,139
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total revenues		$ 1,598	$ 1,567	$ 4,729	$ 4,559

[1] Comprised of Europe, the Middle East and Africa