v3.26.1
Introduction, basis of presentation of the consolidated financial statements (consolidated annual accounts) and other information - Basis of presentation of the consolidated financial statements (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of initial application of standards or interpretations [line items]          
CONSOLIDATED PROFIT/(LOSS) FOR THE YEAR   € 15,500 € 13,744 € 12,183  
Provisions € (8,355) (8,355) (8,407) (8,441) € (8,149)
Other operating expenses   2,429 2,595 3,066  
Other provisions          
Disclosure of initial application of standards or interpretations [line items]          
Provisions (2,004) (2,004) (2,334) (1,919)  
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  
Other operating expenses 359        
Increase (decrease) due to changes in presentation | Other provisions          
Disclosure of initial application of standards or interpretations [line items]          
Provisions € 359 € 359