GOODWILL (Details) $ in Millions	3 Months Ended
	Aug. 31, 2017 USD ($)
Goodwill [Line Items]
Balances at period start	$ 43,045
Goodwill adjustments, net	(25)	[1]
Balances at period end	43,020
Cloud and On-Premise Software [Member]
Goodwill [Line Items]
Balances at period start	38,791
Goodwill adjustments, net	(25)	[1]
Balances at period end	38,766
Hardware [Member]
Goodwill [Line Items]
Balances at period start	2,367
Goodwill adjustments, net	0	[1]
Balances at period end	2,367
Services [Member]
Goodwill [Line Items]
Balances at period start	1,887
Goodwill adjustments, net	0	[1]
Balances at period end	$ 1,887

[1] Pursuant to our business combinations accounting policy, we recorded goodwill adjustments for the effects on goodwill of changes to net assets acquired during the period that such a change is identified, provided that any such change is within the measurement period (up to one year from the date of the acquisition).