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Material accounting policies - Depreciation and Amortization, Property and Equipment (Details)
 12 Months Ended
Dec. 31, 2024
Network infrastructure and equipment | Top of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 40 years
Network infrastructure and equipment | Bottom of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 2 years
Buildings | Top of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 50 years
Buildings | Bottom of range  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful life 5 years