INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2014		Aug. 31, 2013	May 31, 2014
Total intangible assets [Line Items]
Intangible Assets, Gross	$ 16,595			$ 16,580
In-process research and development	15
Additions	15
Accumulated Amortization	(10,990)			(10,443)
Expense	(547)		(595)
Intangible assets subject to amortization	5,590
Total intangible assets, net	5,605			6,137
Intangible assets subject to amortization [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	16,580			16,550
Additions	30
Accumulated Amortization	(10,990)			(10,443)
Expense	(547)
Intangible assets subject to amortization	5,590			6,107
Weighted Average Useful Life (in years)	3 years	[1]
Intangible assets subject to amortization [Member] | Software support agreements and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	5,218			5,218
Accumulated Amortization	(4,542)			(4,403)
Expense	(139)
Intangible assets subject to amortization	676			815
Intangible assets subject to amortization [Member] | Hardware systems support agreements and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	969			969
Accumulated Amortization	(565)			(530)
Expense	(35)
Intangible assets subject to amortization	404			439
Intangible assets subject to amortization [Member] | Developed technology [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	4,412			4,387
Additions	25
Accumulated Amortization	(2,343)			(2,176)
Expense	(167)
Intangible assets subject to amortization	2,069			2,211
Weighted Average Useful Life (in years)	3 years	[1]
Intangible assets subject to amortization [Member] | Core technology [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	1,617			1,617
Accumulated Amortization	(1,355)			(1,294)
Expense	(61)
Intangible assets subject to amortization	262			323
Intangible assets subject to amortization [Member] | Customer relationships and contract backlog [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	2,055			2,054
Additions	1
Accumulated Amortization	(1,531)			(1,459)
Expense	(72)
Intangible assets subject to amortization	524			595
Weighted Average Useful Life (in years)	1 year	[1]
Intangible assets subject to amortization [Member] | SaaS and PaaS agreements and related relationships and other [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	1,793			1,789
Additions	4
Accumulated Amortization	(353)			(305)
Expense	(48)
Intangible assets subject to amortization	1,440			1,484
Weighted Average Useful Life (in years)	3 years	[1]
Intangible assets subject to amortization [Member] | Trademarks [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	516			516
Accumulated Amortization	(301)			(276)
Expense	(25)
Intangible assets subject to amortization	215			240
In-process research and development [Member]
Total intangible assets [Line Items]
In-process research and development	15			30
Additions	$ (15)

[1] Represents weighted average useful lives of intangible assets acquired during fiscal 2015.