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STOCK-BASED EMPLOYEE COMPENSATION (Restricted Stock Units and Performance Share Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 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) 192,775    
Vested (in shares) (172,432)    
Performance share units adjustment (in shares) 127    
Forfeited/Canceled (in shares) (8,093)    
Unvested at March 31, 2019 523,939 511,562  
Share-Based Awards - Weighted Average Grant Date Fair Value      
Unvested (in dollars per share) $ 1,713    
Granted (in dollars per share) 1,714    
Vested (in dollars per share) 1,443    
Performance share units adjustment (in dollars per share) 1,580    
Forfeited/Canceled (in dollars per share) 1,823    
Unvested (in dollars per share) $ 1,802 $ 1,713  
Total unrecognized estimated compensation expense, unvested share-based awards $ 663    
Total future compensation cost related to unvested share-based awards, expected period of recognition 2 years 4 months    
Restricted Stock Units (RSUs)      
Share-Based Awards - Shares      
Granted (in shares) 131,683    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 1,714    
Vesting period (in years) 3 years    
Grant date fair value $ 226    
Performance Share Units 2019 Grants [Member]      
Share-Based Awards - Shares      
Granted (in shares) 61,092    
Share-Based Awards - Weighted Average Grant Date Fair Value      
Granted (in dollars per share) $ 1,714    
Grant date fair value $ 105    
Estimated number of probable shares to be issued (in shares) 61,092    
Maximum shares that could be issued (in shares) 122,184    
Minimum shares that could be issued (in shares) 47,674    
Performance Share Units 2018 Grants      
Share-Based Awards - Shares      
Granted (in shares)   49,721  
Unvested at March 31, 2019 44,900    
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) 86,157    
Maximum shares that could be issued (in shares) 89,800    
Minimum shares that could be issued (in shares) 33,590    
Performance Share Units 2017 Grants [Member]      
Share-Based Awards - Shares      
Granted (in shares)     73,893
Unvested at March 31, 2019 56,506    
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) 88,098    
Maximum shares that could be issued (in shares) 113,012    
Minimum shares that could be issued (in shares) 45,843