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Basis of preparation (Details)
€ in Millions, vaccine_dose in Millions
 1 Months Ended 12 Months Ended
Jul. 31, 2020
vaccine_dose
Dec. 31, 2023
EUR (€)
scenario
emission
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Disclosure of initial application of standards or interpretations [line items]        
Average effective tax rate   22.40% 19.20% 20.00%
Increase in effective tax rate   1.50%    
Planet Care Program, net emissions by 2045 | emission   0    
Planet Care Program, percentage of reduction in scope 1 and 2 greenhouse gas by 2030   55.00%    
Planet Care Program, percentage of reduction in scope 3 greenhouse gas by 2030   30.00%    
Planet Care Program, percentage of reduction in all scopes greenhouse gas by 2030   90.00%    
Planet Care Program, percentage of renewably-sourced energy in all sites by 2030   100.00%    
Planet Care Program, number of global warming scenarios | scenario   3    
Other revenues   € 3,374 € 2,392 € 1,414
Current contract liabilities   € 0 269 321
Maximum        
Disclosure of initial application of standards or interpretations [line items]        
Average effective tax rate   15.00%    
Collaboration agreement with GSK        
Disclosure of initial application of standards or interpretations [line items]        
Other revenues   € 269 85 0
Current contract liabilities     269 319
Other revenue, doses no longer an obligation to be delivered   94    
Collaboration agreement with GSK | US Government        
Disclosure of initial application of standards or interpretations [line items]        
Number of vaccine doses to be supplied | vaccine_dose 100      
Other revenues   411    
Government grant recognised as deduction from development expenses   € 59 € 265 € 147
Argentina        
Disclosure of initial application of standards or interpretations [line items]        
Cumulative inflation rate over three years   100.00%    
Turkey        
Disclosure of initial application of standards or interpretations [line items]        
Cumulative inflation rate over three years   100.00%