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INCENTIVE PLANS - Unvested Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted- average grant date fair value per share (in dollars per share):      
Weighted-average market value (in dollars per share) $ 63.38 $ 73.87 $ 59.12
Unrecognized compensation cost of unvested stock awards $ 538    
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 of period (in shares) 31,728,596    
Granted (in shares) 14,920,917    
Canceled (in shares) (1,104,448)    
Vested (in shares) (15,350,350)    
End of period (in shares) 30,194,715 31,728,596  
Weighted- average grant date fair value per share (in dollars per share):      
Beginning of period (in dollars per share) $ 57.30    
Granted (in dollars per share) 61.78    
Canceled (in dollars per share) 60.45    
Vested (in dollars per share) 53.58    
End of period (in dollars per share) $ 61.30 $ 57.30