INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013		Feb. 29, 2012	May 31, 2012
Total intangible assets [Line Items]
Intangible Assets, Gross	$ 19,928		$ 19,928			$ 19,376
Additions			552
Accumulated Amortization	(13,266)		(13,266)			(11,477)
Expense	(586)	(606)	(1,789)		(1,790)
Intangible Assets, Net	6,662		6,662			7,899
Intangible assets subject to amortization [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	19,928		19,928			19,365
Additions			563
Accumulated Amortization	(13,266)		(13,266)			(11,477)
Expense			(1,789)
Intangible Assets, Net	6,662		6,662			7,888
Weighted Average Useful Life (in years)			6 years	[1]
Intangible assets subject to amortization [Member] | Software support agreements and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	5,298		5,298			5,294
Additions			4
Accumulated Amortization	(3,767)		(3,767)			(3,330)
Expense			(437)
Intangible Assets, Net	1,531		1,531			1,964
Weighted Average Useful Life (in years)			5 years	[1]
Intangible assets subject to amortization [Member] | Hardware systems support agreements and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	776		776			768
Additions			8
Accumulated Amortization	(356)		(356)			(266)
Expense			(90)
Intangible Assets, Net	420		420			502
Weighted Average Useful Life (in years)			5 years	[1]
Intangible assets subject to amortization [Member] | Developed technology [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	7,138		7,138			6,908
Additions			230
Accumulated Amortization	(5,277)		(5,277)			(4,651)
Expense			(626)
Intangible Assets, Net	1,861		1,861			2,257
Weighted Average Useful Life (in years)			6 years	[1]
Intangible assets subject to amortization [Member] | Core technology [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	2,579		2,579			2,549
Additions			30
Accumulated Amortization	(1,855)		(1,855)			(1,609)
Expense			(246)
Intangible Assets, Net	724		724			940
Weighted Average Useful Life (in years)			3 years	[1]
Intangible assets subject to amortization [Member] | Customer relationships and contract backlog [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	2,300		2,300			2,260
Additions			40
Accumulated Amortization	(1,549)		(1,549)			(1,287)
Expense			(262)
Intangible Assets, Net	751		751			973
Weighted Average Useful Life (in years)			2 years	[1]
Intangible assets subject to amortization [Member] | Cloud software subscriptions and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	1,227		1,227			989
Additions			238
Accumulated Amortization	(123)		(123)			(42)
Expense			(81)
Intangible Assets, Net	1,104		1,104			947
Weighted Average Useful Life (in years)			8 years	[1]
Intangible assets subject to amortization [Member] | Trademarks [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	610		610			597
Additions			13
Accumulated Amortization	(339)		(339)			(292)
Expense			(47)
Intangible Assets, Net	271		271			305
Weighted Average Useful Life (in years)			5 years	[1]
In-process research and development [Member]
Total intangible assets [Line Items]
In-process research and development						11
Additions			$ (11)

[1] Represents weighted average useful lives of intangible assets acquired during fiscal 2013.