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Long-term assets - E.2.1. Accounting for property, plant and equipment (Details)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fiber optic network        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives   25 years 15 years  
Computer software        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives     5 years  
Towers, poles and ducts        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives     25 years 15 years
Civil works of towers, poles and ducts        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives     15 years 10 years
Buildings        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives 40 years      
Bottom of range | Related equipment/software        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives   5 years    
Bottom of range | Networks (including civil works)        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives 5 years   5 years  
Bottom of range | Other        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives 2 years      
Top of range | Related equipment/software        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives   10 years    
Top of range | Networks (including civil works)        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives 25 years   7 years  
Top of range | Other        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives 10 years