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Net Product Sales - Schedule of Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 389	$ 108
Net product sales
Disaggregation of Revenue [Line Items]
Total revenue	352	86
COVID
Disaggregation of Revenue [Line Items]
Total revenue	345	84
RSV
Disaggregation of Revenue [Line Items]
Total revenue	7	2
United States | Net product sales
Disaggregation of Revenue [Line Items]
Total revenue	73	31
Europe | Net product sales
Disaggregation of Revenue [Line Items]
Total revenue	239	0
Rest of world | Net product sales
Disaggregation of Revenue [Line Items]
Total revenue	$ 40	$ 55

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