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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Components and classification of share-based compensation expense |  |  |  |
Share-based compensation expense | $ 27 | $ 26 | $ 81 | $ 77
Research and development expenses |  |  |  |
Components and classification of share-based compensation expense |  |  |  |
Share-based compensation expense | 3 | 2 | 9 | 7
Selling, general and administrative expenses |  |  |  |
Components and classification of share-based compensation expense |  |  |  |
Share-based compensation expense | 24 | 24 | 72 | 70
Stock options |  |  |  |
Components and classification of share-based compensation expense |  |  |  |
Share-based compensation expense | 4 | 5 | 12 | 17
RSUs |  |  |  |
Components and classification of share-based compensation expense |  |  |  |
Share-based compensation expense | $ 23 | $ 21 | $ 69 | $ 60

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