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Other Operating Income And Expenses - Additional Information (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income € 617 € 416 € 1,969
Other operating expense 1,422 1,204 2,531
Regeneron | Other operating income (expense)      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income 102 133 € 1,147
Other related parties | Other operating income (expense)      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income 160 153  
Gains on divestment of some mature products € 413 € 288