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STOCKHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Feb. 29, 2016
Feb. 28, 2015
Feb. 29, 2016
Feb. 28, 2015
Mar. 15, 2016
Stock Repurchases (Narrative) [Abstract]          
Approved expansion of stock repurchase program         $ 10,000
Amount available for future repurchases $ 809   $ 809    
Repurchases of common stock (in shares)     222.7 147.7  
Repurchased amount     $ 8,400 $ 6,100  
Repurchased shares that were not settled (in shares)     2.7    
Repurchased amount that was not settled     $ 98    
Dividends on Common Stock [Abstract]          
Dividends per share, declared and paid (in dollars per share) $ 0.15 $ 0.12 $ 0.45 $ 0.36  
Dividends declared per share of outstanding common stock (in dollars per share)         $ 0.15
Dividend payable date     Apr. 28, 2016    
Dividend record date     Apr. 14, 2016    
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation $ 260 $ 234 $ 768 $ 689  
Stock options granted (in shares)     24.0    
Restricted stock-based awards granted (in shares)     32.0    
Forfeitures and cancellations (in shares)     11.0    
Service-based restricted stock units [Member]          
Stock-based Compensation Expense [Line Items]          
Restricted stock-based awards granted (in shares)     30.0    
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 57 45 $ 163 131  
Cloud software as a service and platform as a service [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation 4 3 13 8  
Cloud infrastructure as a service [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation 1 1 3 3  
Software license updates and product support [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation 6 6 18 15  
Hardware products [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation 1 1 4 4  
Hardware support [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation 1 2 4 4  
Services [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation 7 8 22 23  
Research and development [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation 154 138 452 380  
General and administrative [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation $ 29 29 86 116  
Acquisition related and other [Member]          
Stock-based Compensation Expense [Line Items]          
Total stock-based compensation   $ 1 $ 3 $ 5