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Other non-current assets - Additional Information (Details)
€ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Aug. 31, 2022
EUR (€)
Disclosure Of Other Non Current Assets [Line Items]          
Pre-tax impact on other comprehensive income   € 47      
Non-current finance lease receivables   116 € 132    
Non-current finance lease receivables, gross   181 195    
BioAtrium          
Disclosure Of Other Non Current Assets [Line Items]          
Non-current Loans And Receivable   149      
EUROAPI | Associates and joint ventures          
Disclosure Of Other Non Current Assets [Line Items]          
Subordinate Hybrid Bond, Related Party Transactions   € 189   € 200  
Fair value of SPMSD contingent consideration          
Disclosure Of Other Non Current Assets [Line Items]          
Increase In Contingent Consideration   700.00%      
Quoted euro denominated senior bonds          
Disclosure Of Other Non Current Assets [Line Items]          
Debt instruments at fair value through other comprehensive income   € 357      
Senior bond          
Disclosure Of Other Non Current Assets [Line Items]          
Financial assets held for investments       329  
Held-to-maturity investment     346    
Financial instruments held to fund deferred compensation plan          
Disclosure Of Other Non Current Assets [Line Items]          
Financial investments   688 572 512  
Trading equity securities          
Disclosure Of Other Non Current Assets [Line Items]          
Fair value through other comprehensive income   1,559 1,088 936  
Trading equity securities | Level 1          
Disclosure Of Other Non Current Assets [Line Items]          
Fair value through other comprehensive income   467 470 387  
Unquoted equity investments          
Disclosure Of Other Non Current Assets [Line Items]          
Investments in equity instruments designated at fair value through OCI   1,092 618 549  
Unquoted equity investments | Quoted euro denominated senior bonds          
Disclosure Of Other Non Current Assets [Line Items]          
Exchange for financial assets held to meet obligations to employees under post-employment benefit plans   110      
Commitments related to unquoted debt securities          
Disclosure Of Other Non Current Assets [Line Items]          
Investments in equity instruments designated at fair value through OCI   360 65    
Financial assets at fair value through profit or loss   168 159    
Commitments related to unquoted debt securities | Orano Med          
Disclosure Of Other Non Current Assets [Line Items]          
Investments in equity instruments designated at fair value through OCI   300      
Quoted equity securities          
Disclosure Of Other Non Current Assets [Line Items]          
Unrealized after-tax losses   342 349 256  
SPMSD contingent consideration asset          
Disclosure Of Other Non Current Assets [Line Items]          
Fair value of the contingent consideration   113 214 303  
Non-current assets | Fair value of SPMSD contingent consideration          
Disclosure Of Other Non Current Assets [Line Items]          
Fair value of the contingent consideration     104 196  
Unquoted debt securities not meeting the definition of equity instruments          
Disclosure Of Other Non Current Assets [Line Items]          
Financial assets at fair value through profit or loss   165 € 132 115  
Discovery Design and Clinical Development | Orano Med          
Disclosure Of Other Non Current Assets [Line Items]          
Investments in equity instruments designated at fair value through OCI   € 1,900      
Proportion of ownership interests held by non-controlling interests   16.00%      
Non Current Asset          
Disclosure Of Other Non Current Assets [Line Items]          
Fair value of the contingent consideration   € 104      
Increase of ten percent basis point in market interest rate | Debt instruments          
Disclosure Of Other Non Current Assets [Line Items]          
Other comprehensive income before tax   1      
Increase of ten percent basis point in market interest rate | Quoted debt instruments          
Disclosure Of Other Non Current Assets [Line Items]          
Other comprehensive income before tax   € 1      
Regeneron          
Disclosure Of Other Non Current Assets [Line Items]          
Proceeds from sales of investments accounted for using equity method | $ $ 174        
Innovent Biologics          
Disclosure Of Other Non Current Assets [Line Items]          
Investments in equity instruments designated at fair value through other comprehensive income, transaction amount       € 228 € 250