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Stock-Based Compensation | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | Stock-based compensation The following table reflects the components of stock-based compensation expense recognized in our Condensed Consolidated Statements of Operations (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Research and development | $ | 8 |  |  | $ | 8 |  |  | $ | 26 |  |  | $ | 24 |
General and administrative | 10 |  |  | 8 |  |  | 29 |  |  | 24 |
Total stock-based compensation | $ | 18 |  |  | $ | 16 |  |  | $ | 55 |  |  | $ | 48 |

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