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Consolidated shareholders’ equity - Additional Information (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [line items]      
Share capital   € 2,526,245,442  
Number of shares (in shares)   1,263,122,721  
Par value per share (in euros per share)   € 2  
Hedges of net investments in foreign operations € (679,000,000) € (574,000,000) € (580,000,000)
Currency translation differences 218,000,000 [1] € (22,000,000) [2] € 442,000,000 [3]
Opella Business      
Disclosure of classes of share capital [line items]      
Currency translation differences € (300,000,000)    
May 25, 2023      
Disclosure of classes of share capital [line items]      
Period of share repurchase program   18 months  
May 3, 2022      
Disclosure of classes of share capital [line items]      
Period of share repurchase program     18 months
April 30, 2021      
Disclosure of classes of share capital [line items]      
Period of share repurchase program 18 months    
Stock subscription option plan      
Disclosure of classes of share capital [line items]      
Increase in shareholders equity due to exercise of stock purchase option € 75,000,000    
Number of shares issued by exercice of each option (in shares) 1    
[1] (b)These amounts include gains and losses, and the impact of foreign currency translation of the financial statements of subsidiaries outside the Euro zone.
[2] (b)These amounts include gains and losses, and the impact of foreign currency translation of the financial statements of subsidiaries outside the Euro zone.
[3] (a)These amounts include gains and losses, and the impact of foreign currency translation of the financial statements of subsidiaries outside the Euro zone.