Other Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,862	$ 6,066
Grant revenue
Disaggregation of Revenue [Line Items]
Total revenue	24	126
Grant revenue | BARDA
Disaggregation of Revenue [Line Items]
Total revenue	20	122
Grant revenue | Other grant revenue
Disaggregation of Revenue [Line Items]
Total revenue	4	4
Collaboration Revenue by Strategic Collaborator:
Disaggregation of Revenue [Line Items]
Total revenue	10	15
Collaboration Revenue by Strategic Collaborator: | Merck
Disaggregation of Revenue [Line Items]
Total revenue	0	10
Collaboration Revenue by Strategic Collaborator: | Vertex
Disaggregation of Revenue [Line Items]
Total revenue	10	4
Collaboration Revenue by Strategic Collaborator: | Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 0	$ 1