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INCENTIVE PLANS - Unvested Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Weighted- average grant date fair value per share (in dollars per share):      
Granted (in dollars per share)   $ 76.68 $ 61.78
Vested (in dollars per share) $ 67.17    
Weighted-average market value, vested (in dollars per share) 64.23    
Vested, weighted-average grant date fair value (in dollars per share) $ 67.17    
Unrecognized compensation cost of unvested stock awards $ 654    
Weighted-average period of recognition of unrecognized compensation cost of unvested stock awards (in years) 1 year 7 months 6 days    
Unvested Stock Awards      
Unvested stock awards (in shares):      
Beginning balance (in shares) 28,226,292    
Granted (in shares) 17,535,978    
Canceled (in shares) (1,453,029)    
Vested (in shares) (12,664,557)    
Ending balance (in shares) 31,644,684 28,226,292  
Weighted- average grant date fair value per share (in dollars per share):      
Beginning balance (in dollars per share) $ 69.25    
Granted (in dollars per share) 62.10    
Canceled (in dollars per share) 67.01    
Vested (in dollars per share) 67.17    
Ending balance (in dollars per share) 66.22 $ 69.25  
Vested, weighted-average grant date fair value (in dollars per share) $ 67.17