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Other Operating Income And Expenses - Additional Information (Details) - EUR (€)
€ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income € 617 € 617 € 1,292
Other operating expense 2,010 1,422 3,516
Regeneron | Other operating income (expense)      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income 96 102 € 227
Other related parties | Other operating income (expense)      
Disclosure Of Other Operating Income Expenses [Line Items]      
Other operating income 118 160  
Gains on divestment of some mature products € 389 € 413