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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Summary of Stock-Based Compensation Expense
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,
2025202420252024
Research and development$7 $9 $23 $29 
General and administrative7 10 22 30 
Total stock-based compensation$14 $19 $45 $59