SUMMARY OF TOTAL REVENUES BY GEOGRAPHIC REGION (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Disaggregation of Revenue [Line Items]
Total revenues		$ 9,614	$ 9,676	$ 28,369	$ 28,369
Americas [Member]
Disaggregation of Revenue [Line Items]
Total revenues		5,266	5,253	15,671	15,632
EMEA [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[1]	2,781	2,881	8,139	8,213
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[2]	$ 1,567	$ 1,542	$ 4,559	$ 4,524

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

[2] The Asia Pacific region includes Japan