Material accounting policies - Depreciation and Amortization, Property and Equipment (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| 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 |