v3.26.1
Revenues - Summary of Revenues by Collaboration, Category of Revenue and Method of Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
License And Collaboration Agreements [Line Items]        
Total revenues $ 41 $ 160 $ 58 $ 188
Total revenues from collaborations 8 152 18 172
Total revenues from a customer 33 8 40 16
License and development services        
License And Collaboration Agreements [Line Items]        
Total revenues 16 152 28 172
License and development services | Gilead Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 8 152 15 172
License and development services | Taiho Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 4 0 6 0
R&D services | Gilead Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 4 2 6 5
Access rights | Gilead Collaboration | Over time        
License And Collaboration Agreements [Line Items]        
Total revenues 21 6 24 11
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 6   8  
License | Taiho Collaboration | Point in time        
License And Collaboration Agreements [Line Items]        
Total revenues $ 4 $ 0 $ 4 $ 0