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STOCK-BASED COMPENSATION - Stock Option Shares Outstanding and Exercisable (Details)
shares in Millions
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Stock-based compensation  
Exercise price range, low end of range (in dollars per share) $ 10
Exercise price range, high end of range (in dollars per share) $ 48
Option shares outstanding, number of shares (in shares) | shares 2
Weighted Average Remaining Option Term 6 years
Option shares outstanding, weighted average exercise price (in dollars per share) $ 33
Option shares exercisable, number of shares (in shares) | shares 1
Option shares exercisable, weighted average exercise price (in dollars per share) $ 28
Range One  
Stock-based compensation  
Exercise price range, low end of range (in dollars per share) 10
Exercise price range, high end of range (in dollars per share) $ 18
Option shares outstanding, number of shares (in shares) | shares 0
Weighted Average Remaining Option Term 2 years
Option shares outstanding, weighted average exercise price (in dollars per share) $ 18
Option shares exercisable, number of shares (in shares) | shares 0
Option shares exercisable, weighted average exercise price (in dollars per share) $ 18
Range Two  
Stock-based compensation  
Exercise price range, low end of range (in dollars per share) 19
Exercise price range, high end of range (in dollars per share) $ 34
Option shares outstanding, number of shares (in shares) | shares 1
Weighted Average Remaining Option Term 5 years
Option shares outstanding, weighted average exercise price (in dollars per share) $ 26
Option shares exercisable, number of shares (in shares) | shares 1
Option shares exercisable, weighted average exercise price (in dollars per share) $ 25
Range Three  
Stock-based compensation  
Exercise price range, low end of range (in dollars per share) 35
Exercise price range, high end of range (in dollars per share) $ 48
Option shares outstanding, number of shares (in shares) | shares 1
Weighted Average Remaining Option Term 8 years
Option shares outstanding, weighted average exercise price (in dollars per share) $ 41
Option shares exercisable, number of shares (in shares) | shares 0
Option shares exercisable, weighted average exercise price (in dollars per share) $ 39