INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	May. 31, 2015
Total intangible assets [Line Items]
Intangible Assets, Gross	$ 15,048		$ 15,047
Additions	1
Accumulated Amortization	(9,093)		(8,641)
Expense	(452)	$ (547)
Total intangible assets, net	5,955		6,406
Intangible assets subject to amortization [Member] | Software support agreements and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	4,190		4,190
Accumulated Amortization	(2,803)		(2,700)
Expense	(103)
Intangible assets subject to amortization	1,387		1,490
Intangible assets subject to amortization [Member] | Hardware support agreements and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	1,012		1,012
Accumulated Amortization	(690)		(654)
Expense	(36)
Intangible assets subject to amortization	322		358
Intangible assets subject to amortization [Member] | Developed technology [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	4,603		4,602
Additions	1
Accumulated Amortization	(2,512)		(2,355)
Expense	(157)
Intangible assets subject to amortization	2,091		2,247
Intangible assets subject to amortization [Member] | Core technology [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	552		552
Accumulated Amortization	(435)		(411)
Expense	(24)
Intangible assets subject to amortization	117		141
Intangible assets subject to amortization [Member] | Customer relationships and contract backlog [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	2,197		2,197
Accumulated Amortization	(1,775)		(1,710)
Expense	(65)
Intangible assets subject to amortization	422		487
Intangible assets subject to amortization [Member] | SaaS, PaaS and IaaS agreements and related relationships and other [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	1,993		1,993
Accumulated Amortization	(561)		(508)
Expense	(53)
Intangible assets subject to amortization	1,432		1,485
Intangible assets subject to amortization [Member] | Trademarks [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	501		501
Accumulated Amortization	(317)		(303)
Expense	(14)
Intangible assets subject to amortization	$ 184		$ 198