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Other non-current assets - Additional Information (Details)
€ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
May 29, 2020
EUR (€)
shares
Oct. 31, 2022
EUR (€)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
shares
Aug. 31, 2022
EUR (€)
Sep. 14, 2021
Jun. 23, 2020
Disclosure Of Other Non Current Assets [Line Items]                  
Proceeds from sales of investments accounted for using equity method       € 0 € 0 € 10,370 [1]      
Pre-tax impact on other comprehensive income       € 39          
Fair value of SPMSD contingent consideration                  
Disclosure Of Other Non Current Assets [Line Items]                  
Increase in contingent consideration       1.00%          
Level 1                  
Disclosure Of Other Non Current Assets [Line Items]                  
Total financial assets measured at fair value       € 10,765 6,449 10,022      
Quoted euro denominated senior bonds                  
Disclosure Of Other Non Current Assets [Line Items]                  
Debt instruments at fair value through other comprehensive income       329          
Senior bond                  
Disclosure Of Other Non Current Assets [Line Items]                  
Financial assets held for investments         447 426      
Financial instruments held to fund deferred compensation plan                  
Disclosure Of Other Non Current Assets [Line Items]                  
Financial investments       512 549 453      
Trading equity securities                  
Disclosure Of Other Non Current Assets [Line Items]                  
Fair value through other comprehensive income       936 823 588      
Trading equity securities | Level 1                  
Disclosure Of Other Non Current Assets [Line Items]                  
Fair value through other comprehensive income       387 396 439      
Unquoted equity investments                  
Disclosure Of Other Non Current Assets [Line Items]                  
Investments in equity instruments designated at fair value through OCI       549 427 149      
Gain on disposal   € 175              
Unquoted equity investments | Onduo                  
Disclosure Of Other Non Current Assets [Line Items]                  
Proportion of ownership interests held by non-controlling interests   19.00%              
Unquoted equity investments | Level 1                  
Disclosure Of Other Non Current Assets [Line Items]                  
Total financial assets measured at fair value       0 0 0      
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       104          
Quoted equity securities                  
Disclosure Of Other Non Current Assets [Line Items]                  
Unrealized after-tax losses       (256) (322) 200      
SPMSD contingent consideration asset                  
Disclosure Of Other Non Current Assets [Line Items]                  
Fair value of the contingent consideration       303 378 483      
Non current asset | Fair value of SPMSD contingent consideration                  
Disclosure Of Other Non Current Assets [Line Items]                  
Fair value of the contingent consideration       196 275 374      
Unquoted debt securities not meeting the definition of equity instruments                  
Disclosure Of Other Non Current Assets [Line Items]                  
Total financial assets measured at fair value       115 78 63      
Unquoted debt securities not meeting the definition of equity instruments | Level 1                  
Disclosure Of Other Non Current Assets [Line Items]                  
Total financial assets measured at fair value       0 € 0 0      
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          
Translate Bio                  
Disclosure Of Other Non Current Assets [Line Items]                  
Investments in equity instruments designated at fair value through OCI, ownership percentage                 5.00%
Translate Bio                  
Disclosure Of Other Non Current Assets [Line Items]                  
Investments in equity instruments designated at fair value through OCI, ownership percentage         8.00%     5.00%  
Investments in equity instruments designated at fair value through OCI         € 74        
Regeneron                  
Disclosure Of Other Non Current Assets [Line Items]                  
Fair value through other comprehensive income € 221         € 111      
Proceeds from sales of investments accounted for using equity method | $     $ 174            
Sale of stock, number of shares issued in transaction (in shares) | shares 22,800,000                
Non-current financial assets, number of shares (in shares) | shares 400,000         279,766,000,000      
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    
Associates | Trading equity securities                  
Disclosure Of Other Non Current Assets [Line Items]                  
Fair value through other comprehensive income           € 357      
[1] (j)    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.