Severance, acquisition and other costs (Details) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure Of Severance, Acquisition And Other Costs [Line Items] | ||
| Severance | $ (380) | $ (383) |
| Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination and other costs | (137) | (71) |
| Total severance, acquisition and other costs | (517) | $ (454) |
| Ziply Fiber | ||
| Disclosure Of Severance, Acquisition And Other Costs [Line Items] | ||
| Acquisition-related costs recognised as expense for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination and other costs | $ (67) | |