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EQUITY - NON-QUALIFIED STOCK OPTION TRANSACTIONS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Exercised (in shares) (0.3) (2.7) (1.0)
Nonqualified Stock Options      
Shares      
Beginning balance (in shares) 3.8    
Granted (in shares) 0.7    
Exercised (in shares) (0.3)    
Cancelled (in shares) (0.2)    
Ending balance (in shares) 4.0 3.8  
Weighted Average Exercise Price      
Beginning balance (in dollars per share) $ 50.02    
Granted (in dollars per share) 47.84    
Exercised (in dollars per share) 39.59    
Cancelled (in dollars per share) 56.21    
Ending balance (in dollars per share) $ 50.01 $ 50.02  
Aggregate Intrinsic Value      
Balance $ 17 $ 28  
Exercisable      
Shares at year end (in shares) 2.7 2.7  
Weighted Average Exercise Price Exercisable (in dollars per share) $ 50.28 $ 48.85  
Aggregate Intrinsic Value $ 12 $ 23