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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2025
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 March 31,
20252024
Research and development$8 $10 
General and administrative8 10 
Total stock-based compensation$16 $20