SEGMENT INFORMATION (Details) (USD $) In Millions	3 Months Ended
Aug. 31, 2011	Aug. 31, 2010
Reconciliation of Total Operating Segment Margin to Income Before Provision for Income Taxes [Abstract]
Total margin from operating segments	$ 5,055	$ 4,495
Software license updates and product support revenues	(13)	(25)
Hardware systems support revenues	(11)	(61)
Product development and information technology expenses	(1,076)	(1,159)
Marketing and partner program expenses	(132)	(134)
Corporate and general and administrative expenses	(268)	(233)
Amortization of intangible assets	(592)	(603)
Acquisition related and other	(19)	(83)
Restructuring	(101)	(129)
Stock-based compensation	(147)	(129)
Interest expense	(192)	(196)
Non-operating income (expense), net	(33)	52
Income before provision for income taxes	2,471	1,795
Reconciliation of Total Operating Segment Revenues to Total Revenues [Abstract]
Total revenues for operating segments	8,398	7,588
Software license updates and product support revenues	(13)	(25)
Hardware systems support revenues	(11)	(61)
Total revenues	8,374	7,502
Revenues included for management reporting not recognized in consolidated statements of operations (Narrative) [Abstract]
Software license updates and product support revenues	13	25
Hardware systems support revenues	11	61
New software licenses [Abstract]
Revenues	1,493	1,282
Sales and distribution expenses	1,144	892
Margin	349	390
Software license updates and product support [Abstract]
Revenues	4,035	3,475
Software license updates and product support expenses	274	273
Margin	3,761	3,202
Total software business [Abstract]
Revenues	5,528	4,757
Expenses	1,418	1,165
Margin	4,110	3,592
Hardware systems products [Abstract]
Revenues	1,029	1,079
Hardware systems products expenses	473	554
Sales and distribution expenses	266	230
Margin	290	295
Hardware systems support [Abstract]
Revenues	656	680
Hardware systems support expenses	272	292
Margin	384	388
Total hardware systems business [Abstract]
Revenues	1,685	1,759
Expenses	1,011	1,076
Margin	674	683
Total services business [Abstract]
Revenues	1,185	1,072
Services expenses	914	852
Margin	271	220
Totals [Abstract]
Revenues	8,398	7,588
Expenses	3,343	3,093
Margin	$ 5,055	$ 4,495

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