Revenues - Summary of Revenues by Collaboration, Category of Revenue and Method of Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 258	$ 117	$ 112
Total revenues from collaborations	207	80	74
Total revenues from a customer	51	37	38
License and R&D services | Over time | Gilead Collaboration
Disaggregation of Revenue [Line Items]
Total revenues	207	75	74
R&D services | Over time | Gilead Collaboration
Disaggregation of Revenue [Line Items]
Total revenues	8	4	0
License revenue | Point in time | Taiho Collaboration
Disaggregation of Revenue [Line Items]
Total revenues	15	0	0
Access rights | Over time | Gilead Collaboration
Disaggregation of Revenue [Line Items]
Total revenues	28	33	33
Other | Over time | Taiho Collaboration
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 5	$ 5