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ACQUISITIONS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010	Aug. 11, 2010 Phase Forward Incorporated [Member]	Jan. 05, 2011 Art Technology Group, Inc. [Member]	Aug. 31, 2011 Pillar Data Systems, Inc. [Member]	Jul. 18, 2011 Pillar Data Systems, Inc. [Member]
Acquisitions Proforma [Abstract]
Total revenues	$ 8,385	$ 7,617
Net income	1,831	1,324
Basic earnings per share	$ 0.36	$ 0.26
Diluted earnings per share	$ 0.36	$ 0.26
Acquisitions [Line Items]
Total purchase price			736	1,000
Purchase price payable consisting of estimated fair value of the liability for contingent consideration						346
Cash portion of purchase price			735	990
Fair value of stock options and restricted stock-based awards assumed			1	16
Goodwill recorded			329	552		214
Identifiable intangible assets recorded			370	404		142
In-process research and development recorded			20
Net tangible assets (liabilities) assumed			17	50		(10)
Amount of Earn-Out that an affiliate of Mr. Ellison has the first preference right to receive						565
Estimated fair value of the Earn-Out Liability					$ 353
Percentage rights that Mr. Ellison and his affiliates have over any amount of the Earn-Out that exceeds $565 million						55.00%