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INCENTIVE PLANS - Unvested Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Weighted- average grant date fair value per share (in dollars per share):      
Granted (in dollars per share)   $ 61.78 $ 73.87
Weighted-average market value, vested (in dollars per share) $ 79.68    
Unrecognized compensation cost of unvested stock awards $ 580    
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) 30,194,715    
Granted (in shares) 12,361,412    
Canceled (in shares) (606,918)    
Vested (in shares) (13,722,917)    
Ending balance (in shares) 28,226,292 30,194,715  
Weighted- average grant date fair value per share (in dollars per share):      
Beginning balance (in dollars per share) $ 61.30    
Granted (in dollars per share) 76.68    
Canceled (in dollars per share) 69.22    
Vested (in dollars per share) 58.45    
Ending balance (in dollars per share) $ 69.25 $ 61.30