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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, 2023
EUR (€)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Aug. 31, 2022
EUR (€)
Sep. 14, 2021
Disclosure Of Other Non Current Assets [Line Items]            
Pre-tax impact on other comprehensive income   € 47        
Quoted euro denominated senior bonds            
Disclosure Of Other Non Current Assets [Line Items]            
Debt instruments at fair value through other comprehensive income   346        
Senior bond            
Disclosure Of Other Non Current Assets [Line Items]            
Financial assets held for investments     € 329 € 447    
Financial instruments held to fund deferred compensation plan            
Disclosure Of Other Non Current Assets [Line Items]            
Financial investments   572 512 549    
Trading equity securities            
Disclosure Of Other Non Current Assets [Line Items]            
Fair value through other comprehensive income   1,088 936 823    
Trading equity securities | Level 1            
Disclosure Of Other Non Current Assets [Line Items]            
Fair value through other comprehensive income   470 387 396    
Unquoted equity investments            
Disclosure Of Other Non Current Assets [Line Items]            
Investments in equity instruments designated at fair value through OCI   618 549 427    
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   107        
Commitments related to unquoted debt securities            
Disclosure Of Other Non Current Assets [Line Items]            
Investments in equity instruments designated at fair value through OCI   65 60      
Financial assets at fair value through profit or loss   159 192      
Quoted equity securities            
Disclosure Of Other Non Current Assets [Line Items]            
Unrealized after-tax losses   349 256 322    
SPMSD contingent consideration asset            
Disclosure Of Other Non Current Assets [Line Items]            
Fair value of the contingent consideration   214 303 378    
Non-current assets | Fair value of SPMSD contingent consideration            
Disclosure Of Other Non Current Assets [Line Items]            
Fair value of the contingent consideration   104 196 275    
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   132 115 € 78    
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  
Translate Bio            
Disclosure Of Other Non Current Assets [Line Items]            
Investments, ownership percentage           5.00%