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Other operating income (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Other Operating Income [Line Items]      
Other operating income € 1,969 € 859 € 697 [1]
Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Gains on divestment of some mature products 655 418 307
Regeneron | Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Other operating income 1,147 195 164
Other related parties | Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Other operating income € 1,178 245 € 199
Daiichi Sankyo | Other operating income (expense)      
Disclosure Of Other Operating Income [Line Items]      
Other operating income   € 119  
[1] Includes the impacts of the IFRIC final agenda decisions of March 2021 on the costs of configuring or customising application software used in a Software as a Service (SaaS) arrangement and of April 2021 on the attribution of benefits to periods of service, as described in Note A.2.1. to the consolidated financial statements for the year ended December 31, 2021.