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STOCK-BASED EMPLOYEE COMPENSATION (Restricted Stock Units and Performance Share Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Stock Units and Performance Share Units      
Share-Based Awards - Shares      
Unvested at December 31, 2018 511,562    
Granted (in shares) 204,292    
Vested (in shares) (195,371)    
Performance share units adjustment (in shares) 2,635    
Forfeited/Canceled (in shares) (24,929)    
Unvested at June 30, 2019 498,189 511,562  
Share-Based Awards - Weighted Average Grant Date Fair Value      
Unvested (in dollars per share) $ 1,713    
Granted (in dollars per share) 1,719    
Vested (in dollars per share) 1,447    
Performance share units adjustment (in dollars per share) 1,540    
Forfeited/Canceled (in dollars per share) 1,778    
Unvested (in dollars per share) $ 1,816 $ 1,713  
Total unrecognized estimated compensation expense, unvested share-based awards $ 578    
Total future compensation cost related to unvested share-based awards, expected period of recognition 2 years 1 month 6 days    
Restricted Stock Units (RSUs)      
Share-Based Awards - Shares      
Granted (in shares) 142,380    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 1,721    
Vesting period (in years) 3 years    
Grant date fair value $ 245    
Performance Share Units 2019 Grants      
Share-Based Awards - Shares      
Granted (in shares) 61,912    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 1,716    
Grant date fair value $ 106    
Estimated number of probable shares to be issued (in shares) 61,037    
Maximum shares that could be issued (in shares) 122,074    
Minimum shares that could be issued (in shares) 47,619    
Performance Share Units 2018 Grants      
Share-Based Awards - Shares      
Granted (in shares)   49,721  
Unvested at June 30, 2019 43,178    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share)   $ 2,034  
Grant date fair value   $ 101  
Estimated number of probable shares to be issued (in shares) 82,778    
Maximum shares that could be issued (in shares) 86,356    
Minimum shares that could be issued (in shares) 31,868    
Performance Share Units 2017 Grants      
Share-Based Awards - Shares      
Granted (in shares)     73,893
Unvested at June 30, 2019 54,110    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share)     $ 1,735
Grant date fair value     $ 128
Estimated number of probable shares to be issued (in shares) 83,653    
Maximum shares that could be issued (in shares) 108,220    
Minimum shares that could be issued (in shares) 43,447