SUMMARY OF TOTAL REVENUES BY GEOGRAPHIC REGION (Details) - USD ($) $ in Millions		3 Months Ended
		Aug. 31, 2018	Aug. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenues		$ 9,193	$ 9,104
Americas [Member]
Disaggregation of Revenue [Line Items]
Total revenues		5,161	5,098
EMEA [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[1]	2,576	2,535
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[2]	$ 1,456	$ 1,471

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

[2] The Asia Pacific region includes Japan