INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	May 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 12,983		$ 13,065
Additions & Adjustments, net	(82)
Accumulated Amortization	(5,797)		(5,386)
Expense	(411)	$ (311)
Intangible Assets, Net	7,186		7,679
Developed technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	5,183		5,397
Additions & Adjustments, net	(214)
Accumulated Amortization	(2,485)		(2,295)
Expense	(190)
Intangible Assets, Net	2,698		3,102
SaaS, PaaS and IaaS agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	4,219		4,105
Additions & Adjustments, net	114
Accumulated Amortization	(1,240)		(1,089)
Expense	(151)
Intangible Assets, Net	2,979		3,016
Software support agreements and related relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	1,565		1,565
Additions & Adjustments, net	0
Accumulated Amortization	(590)		(559)
Expense	(31)
Intangible Assets, Net	975		1,006
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	2,016		1,998
Additions & Adjustments, net	18
Accumulated Amortization	(1,482)		(1,443)
Expense	(39)
Intangible Assets, Net	$ 534		$ 555