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SHARE-BASED COMPENSATION - Stock-Based Compensation Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares, Stock Options      
Outstanding at beginning of period (in shares) 458    
Granted (in shares) 36    
Exercised (in shares) (1)    
Forfeited (in shares) (15)    
Expired (in shares) (78)    
Outstanding at end of period (in shares) 400 458  
Exercisable (in shares) 305    
Expected to vest (in shares) 90    
Weighted average exercise price, Stock Options      
Outstanding at beginning of period (in dollars per share) $ 18.66    
Granted (in dollars per share) 10.56    
Forfeited (in dollars per share) 7.48    
Exercised (in dollars per share) 11.12    
Expired (in dollars per share) 19.14    
Outstanding at end of period (in dollars per share) 18.16 $ 18.66  
Exercisable (in dollars per share) 20.28    
Expected to vest (in dollars per share) $ 11.50    
Weighted average contractual term (in years)      
Stock options, weighted average remaining contractual term, outstanding 4 years 6 months    
Stock options, weighted average remaining contractual term, exercisable 3 years 3 months 18 days    
Stock options, weighted average remaining contractual term, expected to vest 8 years 2 months 12 days    
Intrinsic value      
Stock options, intrinsic value, outstanding $ 156    
Stock options, intrinsic value, exercisable 62    
Stock options, intrinsic value, expected to vest $ 87    
RSUs      
Shares      
Outstanding at beginning of period (in shares) 28    
Granted (in shares) 46    
Exercised (in shares) (10)    
Forfeited (in shares) (4)    
Outstanding at end of period (in shares) 60 28  
Expected to vest (in shares) 49    
Weighted average grant date fair value      
Outstanding at beginning of period (in dollars per share) $ 13.29    
Granted (in dollars per share) 7.91 $ 10.12 $ 13.96
Exercised (in dollars per share) 14.44    
Forfeited (in dollars per share) 11.80    
Outstanding at end of period (in dollars per share) 9.04 $ 13.29  
Expected to vest (in dollars per share) $ 9.41    
Intrinsic value      
Intrinsic value, outstanding $ 653    
Intrinsic value, expected to vest $ 533    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Weighted average remaining contractual term, outstanding 2 years 1 month 6 days    
Weighted average remaining contractual term, expected to vest 1 year 10 months 24 days