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INCENTIVE PLANS - Unvested Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Weighted- average grant date fair value per share (in dollars per share):      
Weighted-average market value (in dollars per share) $ 77.65 $ 59.12 $ 37.35
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 8 months 1 day    
Unvested Stock Awards      
Unvested stock awards (in shares):      
Beginning of period (in shares) 36,931,040    
Granted (in shares) 12,896,599    
Canceled (in shares) (1,315,456)    
Vested (in shares) (16,783,587)    
End of period (in shares) 31,728,596 36,931,040  
Weighted- average grant date fair value per share (in dollars per share):      
Beginning of period (in dollars per share) $ 47.89    
Granted (in dollars per share) 73.87    
Canceled (in dollars per share) 54.50    
Vested (in dollars per share) 49.54    
End of period (in dollars per share) $ 57.30 $ 47.89