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Other Revenue - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 63 Months Ended
Apr. 30, 2024
USD ($)
Apr. 30, 2020
USD ($)
participant
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 15, 2025
USD ($)
Disaggregation of Revenue [Line Items]              
Number of participants | participant   30,000          
Upfront payment       $ 320      
Contract with customer, liability       252 $ 211    
Total revenue       1,944 3,236 $ 6,848  
Licensing and royalty revenue              
Disaggregation of Revenue [Line Items]              
Total revenue       11 42 0  
Licensing and royalty revenue | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement              
Disaggregation of Revenue [Line Items]              
Upfront payment $ 50            
Contract with customer, liability 20            
Other revenue              
Disaggregation of Revenue [Line Items]              
Upfront payment       212      
Contract with customer, liability       145 23    
Total revenue       126 $ 127 $ 177  
Other revenue | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement              
Disaggregation of Revenue [Line Items]              
Contract with customer, liability 20            
Total revenue $ 30            
Revenue recognized     $ 20        
BARDA              
Disaggregation of Revenue [Line Items]              
Award amount   $ 483         $ 1,800
Amount committed for funding       $ 62