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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
License And Collaboration Agreements [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 48	$ 32	$ 232	$ 86
License and R&D services | Gilead Collaboration | Over time
License And Collaboration Agreements [Line Items]
Revenue from contract with customer, excluding assessed tax	25	20	185	57
Access rights | Gilead Collaboration | Over time
License And Collaboration Agreements [Line Items]
Revenue from contract with customer, excluding assessed tax	5	8	22	25
License revenue | Taiho Collaboration | Point in time
License And Collaboration Agreements [Line Items]
Revenue from contract with customer, excluding assessed tax	15	0	15	0
R&D services | Taiho Collaboration | Over time
License And Collaboration Agreements [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 3	$ 4	$ 10	$ 4