SUMMARY OF TOTAL REVENUES BY GEOGRAPHIC REGION (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2019	May 31, 2018	May 31, 2017
Disaggregation of Revenue [Line Items]
Total revenues		$ 39,506	$ 39,383	$ 37,792
Americas [Member]
Disaggregation of Revenue [Line Items]
Total revenues		21,856	21,648	21,121
EMEA [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[1]	11,270	11,409	10,614
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total revenues		$ 6,380	$ 6,326	$ 6,057

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