STOCKHOLDERS' EQUITY (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Sep. 18, 2013	Jun. 20, 2013
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)	$ 0.12	$ 0.06
Dividends declared per share of outstanding common stock (in dollars per share)			$ 0.12
Dividend payable date	Oct. 29, 2013
Dividend record date	Oct. 08, 2013
Stock Repurchases (Narrative) [Abstract]
Approved expansion of stock repurchase program				$ 12,000
Amount available for future repurchases	11,100
Repurchases of common stock (in shares)	92.8	104.2
Repurchased amount	3,000	3,100
Repurchased shares that were not settled (in shares)	4.4
Repurchased amount that was not settled	139
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	200	193
Stock option grants (in shares)	114
Forfeitures and cancellations (in shares)	7
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract]
Expected life (in years)	5 years 1 month	5 years 1 month
Risk-free interest rate	1.40%	0.70%
Volatility	27.00%	32.00%
Dividend yield	1.60%	0.80%
Weighted-average fair value per share (in dollars per share)	$ 6.63	$ 7.83
Sales and marketing [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	41	37
Software license updates and product support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	6	5
Hardware systems products [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	2
Hardware systems support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	3	1
Services [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	7	9
Research and development [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	97	83
General and administrative [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	42	41
Acquisition related and other [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	$ 2	$ 17