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STOCK-BASED EMPLOYEE COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Executive Officers    
Number of Shares    
Granted (in shares)   0
Stock Options    
Number of Shares    
Balance (in shares), December 31, 2020 152,746  
Exercised (in shares) (655)  
Forfeited (in shares) (7,275)  
Balance (in shares), March 31, 2021 144,816 152,746
Exercisable (in shares), March 31, 2021 4,230  
Weighted-average Exercise Price    
Balance (in dollars per share), December 31, 2020 $ 1,401  
Exercised (in dollars per share) 1,094  
Forfeited (in dollars per share) 1,411  
Balance (in dollars per share), March 31, 2021 1,402 $ 1,401
Exercisable (in dollars per share), March 31, 2021 $ 1,217  
Aggregate Intrinsic Value    
Balance $ 134 $ 126
Exercisable $ 5  
Weighted-average Remaining Contractual Term    
Balance 9 years 9 years 3 months 18 days
Exercisable 5 years 7 months 6 days  
Stock option term 10 years