STOCKHOLDERS' EQUITY (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012	Jun. 18, 2012
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)	$ 0.18	$ 0.06	$ 0.30	$ 0.18
Stock Repurchases (Narrative) [Abstract]
Approved expansion of stock repurchase program					$ 10,000
Amount available for future repurchases	5,000
Repurchases of common stock (in shares)			261.7	119.6
Repurchased amount			8,200	3,500
Repurchased shares that were not settled (in shares)	2.9
Repurchased amount that was not settled	100
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	180	175	566	474
Stock option grants and assumed stock options			118
Forfeitures and cancellations			17
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract]
Expected life (in years)	4 years 8 months	4 years 8 months	5 years 1 month	5 years 1 month
Risk-free interest rate	0.70%	0.80%	0.70%	1.60%
Volatility	26.00%	32.00%	31.00%	30.00%
Dividend yield	0.70%	0.80%	0.80%	0.70%
Weighted-average fair value per share	$ 7.00	$ 15.52	$ 7.97	$ 9.33
Sales and marketing [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	32	30	112	86
Software license updates and product support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	5	5	15	13
Hardware systems products [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1		2	1
Hardware systems support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1	1	3	4
Services [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	7	6	24	16
Research and development [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	86	74	258	213
General and administrative [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	40	41	122	120
Acquisition related and other [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	$ 8	$ 18	$ 30	$ 21