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Other operating income (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Other Operating Income [Line Items]      
Other operating income € 1,292 € 1,969 € 859
Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Gains on divestment of some mature products 688 655 418
Regeneron | Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Other operating income 227 1,147 195
Other related parties | Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Other operating income € 290 € 1,178 245
Daiichi Sankyo | Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Other operating income     € 119