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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-based compensation
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,
2024202320242023
Research and development$9 $8 $29 $26 
General and administrative10 10 30 29 
Total stock-based compensation$19 $18 $59 $55