SUMMARY OF TOTAL REVENUES BY GEOGRAPHIC REGION (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Disaggregation of Revenue [Line Items]
Total revenues		$ 9,614	$ 9,562	$ 18,832	$ 18,755
Americas [Member]
Disaggregation of Revenue [Line Items]
Total revenues		5,304	5,243	10,454	10,404
EMEA [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[1]	2,695	2,782	5,248	5,358
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Total revenues		$ 1,615	$ 1,537	$ 3,130	$ 2,993

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