GOODWILL (Details) - USD ($) $ in Millions		12 Months Ended
		May 31, 2017	May 31, 2016
Goodwill [Line Items]
Balances at period start		$ 34,590	$ 34,087
Goodwill from acquisitions		8,543	518
Goodwill adjustments, net	[1]	(88)	(15)
Balances at period end		43,045	34,590
Cloud and On-Premise Software [Member]
Goodwill [Line Items]
Balances at period start		30,336	29,830
Goodwill from acquisitions		8,543	518
Goodwill adjustments, net	[1]	(88)	(12)
Balances at period end		38,791	30,336
Hardware [Member]
Goodwill [Line Items]
Balances at period start		2,367	2,370
Goodwill from acquisitions		0	0
Goodwill adjustments, net	[1]	0	(3)
Balances at period end		2,367	2,367
Services [Member]
Goodwill [Line Items]
Balances at period start		1,887	1,887
Goodwill from acquisitions		0	0
Goodwill adjustments, net	[1]	0	0
Balances at period end		$ 1,887	$ 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).