v3.26.1
Introduction, basis of presentation of the consolidated financial statements (consolidated annual accounts) and other information - Information relating to 2024 and 2023 (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of initial application of standards or interpretations [line items]        
CONSOLIDATED PROFIT/(LOSS) FOR THE YEAR   € 15,500 € 13,744 € 12,183
Increase (decrease) due to changes in presentation        
Disclosure of initial application of standards or interpretations [line items]        
CONSOLIDATED PROFIT/(LOSS) FOR THE YEAR € 427   € 403 € 352
Mexican peso        
Disclosure of initial application of standards or interpretations [line items]        
Change in foreign currency exchange rate (as a percent)   2.05%    
Change in average foreign currency exchange rate (as a percent)   (8.95%)    
US dollar        
Disclosure of initial application of standards or interpretations [line items]        
Change in foreign currency exchange rate (as a percent)   (11.62%)    
Change in average foreign currency exchange rate (as a percent)   (4.15%)    
Brazilian real        
Disclosure of initial application of standards or interpretations [line items]        
Change in foreign currency exchange rate (as a percent)   (0.47%)    
Change in average foreign currency exchange rate (as a percent)   (7.86%)    
Argentine peso        
Disclosure of initial application of standards or interpretations [line items]        
Change in foreign currency exchange rate (as a percent)   (37.23%)    
Pound sterling        
Disclosure of initial application of standards or interpretations [line items]        
Change in foreign currency exchange rate (as a percent)   (4.99%)    
Change in average foreign currency exchange rate (as a percent)   (1.20%)    
Chilean peso        
Disclosure of initial application of standards or interpretations [line items]        
Change in foreign currency exchange rate (as a percent)   (2.57%)    
Change in average foreign currency exchange rate (as a percent)   (4.90%)    
Polish zloty        
Disclosure of initial application of standards or interpretations [line items]        
Change in foreign currency exchange rate (as a percent)   1.30%    
Change in average foreign currency exchange rate (as a percent)   1.56%