INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	May 31, 2011
Total intangible assets [Line Items]
In-process research and development	$ 50
Amortization of Intangible Assets	(592)	(603)
Intangible assets, net	7,662		7,860
Intangible assets subject to amortization [Member] | Total intangible assets subject to amortization [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	17,251		16,857
Additions to Intangible Assets	394
Accumulated Amortization	(9,639)		(9,047)
Amortization of Intangible Assets	(592)
Intangible Assets, Net	7,612		7,810
In-process research and development [Member]
Total intangible assets [Line Items]
In-process research and development	50		50
Total intangible assets type [Member] | Total intangible assets [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	17,301		16,907
Additions to Intangible Assets	394
Accumulated Amortization	(9,639)		(9,047)
Amortization of Intangible Assets	(592)
Intangible assets, net	7,662		7,860
Software support agreements and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	5,205		5,177
Additions to Intangible Assets	28
Accumulated Amortization	(2,889)		(2,745)
Amortization of Intangible Assets	(144)
Intangible Assets, Net	2,316		2,432
Weighted Average Useful Life (in years)	9
Hardware systems support agreements and related relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	768		760
Additions to Intangible Assets	8
Accumulated Amortization	(176)		(147)
Amortization of Intangible Assets	(29)
Intangible Assets, Net	592		613
Weighted Average Useful Life (in years)	7
Developed technology [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	6,102		6,034
Additions to Intangible Assets	68
Accumulated Amortization	(3,962)		(3,728)
Amortization of Intangible Assets	(234)
Intangible Assets, Net	2,140		2,306
Weighted Average Useful Life (in years)	5
Core technology [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	2,548		2,295
Additions to Intangible Assets	253
Accumulated Amortization	(1,352)		(1,272)
Amortization of Intangible Assets	(80)
Intangible Assets, Net	1,196		1,023
Weighted Average Useful Life (in years)	6
Customer relationships [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	2,091		2,063
Additions to Intangible Assets	28
Accumulated Amortization	(1,015)		(926)
Amortization of Intangible Assets	(89)
Intangible Assets, Net	1,076		1,137
Weighted Average Useful Life (in years)	7
Trademarks [Member]
Total intangible assets [Line Items]
Intangible Assets, Gross	537		528
Additions to Intangible Assets	9
Accumulated Amortization	(245)		(229)
Amortization of Intangible Assets	(16)
Intangible Assets, Net	$ 292		$ 299
Weighted Average Useful Life (in years)	7