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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

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