Business acquisition and disposition - Narrative (Details) $ in Millions, $ in Millions |
3 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
|
Aug. 01, 2025
CAD ($)
|
Jun. 30, 2026
CAD ($)
|
Jun. 30, 2025
CAD ($)
|
Jun. 30, 2026
CAD ($)
|
Jun. 30, 2025
CAD ($)
|
Mar. 26, 2026
CAD ($)
|
Aug. 01, 2025
USD ($)
|
|
| Disclosure of detailed information about business combination [line items] | |||||||
| Severance, acquisition and other costs | $ 50 | $ 41 | $ 44 | $ 288 | |||
| Disposition of land | $ 675 | ||||||
| Ziply Fiber | |||||||
| Disclosure of detailed information about business combination [line items] | |||||||
| Consideration recognized as of acquisition date | $ 5,010 | $ 3,640 | |||||
| Severance, acquisition and other costs | $ 81 | ||||||