v3.26.1
Business Segment - Summary of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting, Asset Reconciling Item [Line Items]    
Total revenues $ 17 $ 28
Adjusted for expense (income):    
Interest income, net 3 1
Net loss (128) (112)
Reportable segment    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total revenues 17 28
Adjusted for expense (income):    
Late-stage development programs 60 55
Early-stage development and preclinical programs 18 42
Compensation and personnel costs 70 66
Depreciation and amortization 2 3
Interest income, net (6) (10)
Other segment items 20 22
Partnership reimbursements (19) (38)
Net loss $ (128) $ (112)