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STOCK-BASED COMPENSATION - Changes in Outstanding RSU Grants (Details) - RSUs - $ / shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of RSUs (in millions)      
Outstanding beginning balance (in shares) 5.8    
Granted (in shares) 0.5    
Distributed (in shares) (1.7)    
Forfeited (in shares) (0.2)    
Outstanding ending balance (in shares) 4.4 5.8  
Weighted Average Grant-Date Fair Value (per unit)      
Outstanding beginning balance (in USD per share) $ 107    
Granted (in USD per share) 141 $ 101 $ 117
Distributed (in USD per share) 113    
Forfeited (in USD per share) 106    
Outstanding ending balance (in USD per share) $ 109 $ 107