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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Sep. 16, 2015
Dividends on Common Stock [Abstract]      
Dividends per share, declared and paid (in dollars per share) $ 0.15 $ 0.12  
Dividends declared per share of outstanding common stock (in dollars per share)     $ 0.15
Dividend payable date Oct. 28, 2015    
Dividend record date Oct. 14, 2015    
Stock Repurchases (Narrative) [Abstract]      
Amount available for future repurchases $ 6,200    
Repurchases of common stock (in shares) 75.7 48.8  
Repurchased amount $ 3,000 $ 2,000  
Repurchased shares that were not settled (in shares) 5.0    
Repurchased amount that was not settled $ 185    
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation $ 253 215  
Stock options granted (in shares) 24.0    
Restricted stock-based awards granted (in shares) 28.0    
Forfeitures and cancellations (in shares) 4.0    
Service-based restricted stock units [Member]      
Stock-based Compensation Expense [Line Items]      
Restricted stock-based awards granted (in shares) 26.0    
Performance-based restricted stock units [Member]      
Stock-based Compensation Expense [Line Items]      
Restricted stock-based awards granted (in shares) 2.0    
Chief Technology Officer and Chief Executive Officers [Member]      
Stock-based Compensation Expense [Line Items]      
Stock options granted (in shares) 7.0    
Expiration date 5 years    
Other stock options [Member]      
Stock-based Compensation Expense [Line Items]      
Expiration date 10 years    
Sales and marketing [Member]      
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation $ 51 43  
Cloud software as a service and platform as a service [Member]      
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation 4 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 6 5  
Hardware products [Member]      
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation 2 1  
Hardware support [Member]      
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation 1 1  
Services [Member]      
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation 8 6  
Research and development [Member]      
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation 148 108  
General and administrative [Member]      
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation 29 45  
Acquisition related and other [Member]      
Stock-based Compensation Expense [Line Items]      
Total stock-based compensation $ 3 $ 3