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SHARE-BASED COMPENSATION - Summary of Share-based Compensation Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Components and classification of share-based compensation expense        
Share-based compensation expense $ 33 $ 27 $ 95 $ 81
Research and development expenses        
Components and classification of share-based compensation expense        
Share-based compensation expense 2 3 7 9
Selling, general and administrative expenses        
Components and classification of share-based compensation expense        
Share-based compensation expense 31 24 88 72
Stock options        
Components and classification of share-based compensation expense        
Share-based compensation expense 4 4 11 12
RSUs        
Components and classification of share-based compensation expense        
Share-based compensation expense $ 29 $ 23 $ 84 $ 69