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Stock-Based Compensation
 9 Months Ended
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,
2023202220232022
Research and development$8 $8 $26 $24 
General and administrative10 8 29 24 
Total stock-based compensation$18 $16 $55 $48