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Stock-Based Compensation
 6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
2024202320242023
Research and development$10 $9 $20 $18 
General and administrative10 9 20 19 
Total stock-based compensation$20 $18 $40 $37