v3.26.3
Revenues - Summary of Revenues by Collaboration, Category of Revenue and Method of Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
License And Collaboration Agreements [Line Items]        
Total revenues $ 9 $ 26 $ 67 $ 214
Total revenues from collaborations 6 20 24 192
Total revenues from a customer 3 6 43 22
License and development services        
License And Collaboration Agreements [Line Items]        
Total revenues 8 20 36 192
License and development services | Gilead Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 6 20 21 192
License and development services | Taiho Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 2 0 8 0
R&D services | Gilead Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 1 3 7 8
Access rights | Gilead Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 0 3 24 14
Other | Gilead Collaboration | Point in time        
License And Collaboration Agreements [Line Items]        
Total revenues 0 0 3 0
Other | Taiho Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 1   10  
License | Taiho Collaboration | Point in time        
License And Collaboration Agreements [Line Items]        
Total revenues $ 0 $ 0 $ 4 $ 0