INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2011	Nov. 30, 2010	May 31, 2011
In-process research and development	$ 11		$ 11
Amortization of Intangible Assets	(592)	(614)	(1,184)	(1,217)
Intangible assets, net	7,152		7,152		7,860
Software support agreements and related relationships [Member]
Intangible Assets, Gross	5,221		5,221		5,177
Additions to Intangible Assets			44
Accumulated Amortization	(3,035)		(3,035)		(2,745)
Amortization of Intangible Assets			(290)
Intangible Assets, Net	2,186		2,186		2,432
Weighted Average Useful Life (in years)			9
Hardware systems support agreements and related relationships [Member]
Intangible Assets, Gross	768		768		760
Additions to Intangible Assets			8
Accumulated Amortization	(206)		(206)		(147)
Amortization of Intangible Assets			(59)
Intangible Assets, Net	562		562		613
Weighted Average Useful Life (in years)			7
Developed technology [Member]
Intangible Assets, Gross	6,199		6,199		6,034
Additions to Intangible Assets			165
Accumulated Amortization	(4,185)		(4,185)		(3,728)
Amortization of Intangible Assets			(457)
Intangible Assets, Net	2,014		2,014		2,306
Weighted Average Useful Life (in years)			5
Core technology [Member]
Intangible Assets, Gross	2,549		2,549		2,295
Additions to Intangible Assets			254
Accumulated Amortization	(1,440)		(1,440)		(1,272)
Amortization of Intangible Assets			(168)
Intangible Assets, Net	1,109		1,109		1,023
Weighted Average Useful Life (in years)			6
Customer relationships [Member]
Intangible Assets, Gross	2,098		2,098		2,063
Additions to Intangible Assets			35
Accumulated Amortization	(1,103)		(1,103)		(926)
Amortization of Intangible Assets			(177)
Intangible Assets, Net	995		995		1,137
Weighted Average Useful Life (in years)			7
Trademarks [Member]
Intangible Assets, Gross	537		537		528
Additions to Intangible Assets			9
Accumulated Amortization	(262)		(262)		(229)
Amortization of Intangible Assets			(33)
Intangible Assets, Net	275		275		299
Weighted Average Useful Life (in years)			7
Intangible assets subject to amortization [Member] | Total intangible assets subject to amortization [Member]
Intangible Assets, Gross	17,372		17,372		16,857
Additions to Intangible Assets			515
Accumulated Amortization	(10,231)		(10,231)		(9,047)
Amortization of Intangible Assets			(1,184)
Intangible Assets, Net	7,141		7,141		7,810
In-process research and development [Member]
In-process research and development	11		11		50
Additions to Intangible Assets			(39)
Total intangible assets type [Member] | Total intangible assets [Member]
Intangible Assets, Gross	17,383		17,383		16,907
Additions to Intangible Assets			476
Accumulated Amortization	(10,231)		(10,231)		(9,047)
Amortization of Intangible Assets			(1,184)
Intangible assets, net	$ 7,152		$ 7,152		$ 7,860