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STOCKHOLDERS' EQUITY Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions
9 Months Ended
Mar. 13, 2019
Feb. 28, 2019
Feb. 28, 2018
Stock Repurchases [Abstract]      
Amount available for future repurchases   $ 11,800,000,000  
Repurchases of common stock (in shares)   621.8 131.6
Repurchased amount   $ 30,000,000,000 $ 6,500,000,000
Repurchased shares that were not settled (in shares)   5.6  
Repurchased amount that was not settled   $ 293,000,000  
Approved expansion of stock repurchase program   $ 24,000,000,000  
Stock-Based Compensation Expense and Stock Awards [Abstract]      
Restricted stock-based units granted (in shares)   49.0  
Stock options granted (in shares)   7.0  
Forfeitures and cancellations (in shares)   24.0  
Subsequent Event [Member]      
Dividends on Common Stock [Abstract]      
Dividends declared per share of outstanding common stock (in dollars per share) $ 0.24    
Dividend payable date Apr. 25, 2019    
Dividend record date Apr. 11, 2019    
Increase in quarterly cash dividend per share $ 0.05