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Income Tax - Additional Information (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Corporate income tax rate 15.00%    
Solidarity surcharge rate 5.50%    
Change in average trade tax rate 15.00%    
Statutory tax rate 30.79% 30.78% 30.99%
Corporate income tax losses € 596,359,000 € 356,044,000 € 179,264,000
Trade tax losses 513,561,000 € 352,341,000 € 176,425,000
Deferred tax assets and liabilities, net recognized 160,952,000    
Accumulated federal tax credits 756,000    
Accumulated state tax credits 250,000    
German Tax Group      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Corporate income tax losses 457,900,000    
Trade tax losses 450,900,000    
Deferred tax assets for unused tax losses recognized 0    
Deferred tax assets and liabilities, net recognized 161,000,000    
German Entities Not Within Tax Group      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Corporate income tax losses 1,700,000    
Trade tax losses 1,800,000    
Deferred tax assets for unused tax losses recognized 0    
U.S. Tax Group      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Corporate income tax losses 136,800,000    
Trade tax losses 60,900,000    
Federal tax losses subject to expiration € 20,900,000    
Federal tax losses expiration year 2033    
Federal tax losses not subject to expiration € 115,900,000    
State tax losses subject to expiration € 60,900,000    
State tax losses expiration year 2033    
BioNTech USA Holding LLC      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Statutory tax rate 21.00%    
State income tax with average rate 8.10%