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Introduction - Change in accounting estimate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]        
Depreciation $ (961) $ (916) $ (978)  
Change in useful life        
Disclosure of detailed information about property, plant and equipment [line items]        
Depreciation   $ 48 $ 27  
Fiber optic network        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives   25 years 15 years  
Related equipment/software | Bottom of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives   5 years    
Related equipment/software | Top of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives   10 years    
Networks (including civil works) | Bottom of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives 5 years   5 years  
Networks (including civil works) | Top of range        
Disclosure of detailed information about property, plant and equipment [line items]        
Estimated useful lives 25 years   7 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