STOCKHOLDERS' EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	Sep. 18, 2014
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)	$ 0.12	$ 0.12
Dividends declared per share of outstanding common stock (in dollars per share)			$ 0.12
Dividend payable date	Oct. 29, 2014
Dividend record date	Oct. 08, 2014
Stock Repurchases (Narrative) [Abstract]
Approved expansion of stock repurchase program			$ 13,000
Amount available for future repurchases	2,300
Repurchases of common stock (in shares)	48,800,000	92,800,000
Repurchased amount	2,000	3,000
Repurchased shares that were not settled (in shares)	2,300,000
Repurchased amount that was not settled	94
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	215	200
Stock options granted and assumed (in shares)	30,000,000
Restricted stock-based awards granted (in shares)	22,000,000
Forfeitures and cancellations (in shares)	6,000,000
Equivalent number of shares deducted against share pool (in actual number of shares)	2.5
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract]
Expected life (in years)	5 years 2 months	5 years 1 month
Risk-free interest rate	1.70%	1.40%
Volatility	23.00%	27.00%
Dividend yield	1.20%	1.60%
Weighted-average fair value per share (in dollars per share)	$ 8.69	$ 6.63
Sales and marketing [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	43	39
Cloud software-as-a-service and platform-as-a-service [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	2	2
Cloud infrastructure-as-a-service [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1	1
Software license updates and product support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	5	6
Hardware systems products [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1	2
Hardware systems support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1	3
Services [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	6	6
Research and development [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	108	97
General and administrative [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	45	42
Acquisition related and other [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	$ 3	$ 2
Performance-based restricted stock units [Member]
Stock-based Compensation Expense [Line Items]
Restricted stock-based awards granted (in shares)	3,000,000
Maximum percentage that can exceed target performance metric	150.00%