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SHARE-BASED COMPENSATION - Summary of Share-based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Components and classification of share-based compensation expense        
Share-based compensation expense $ 31 $ 27 $ 62 $ 54
Research and development expenses        
Components and classification of share-based compensation expense        
Share-based compensation expense 2 3 5 6
Selling, general and administrative expenses        
Components and classification of share-based compensation expense        
Share-based compensation expense 29 24 57 48
Stock options        
Components and classification of share-based compensation expense        
Share-based compensation expense 3 4 7 8
RSUs        
Components and classification of share-based compensation expense        
Share-based compensation expense $ 28 $ 23 $ 55 $ 46