revenue from contracts with customers - Revenues (Details) - Minimum - CAD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Disclosure of transaction price allocated to remaining performance obligations | ||
| Transaction price allocated to remaining performance obligations | $ 3,352 | $ 3,498 |
| The 12-month period ending one year hence | ||
| Disclosure of transaction price allocated to remaining performance obligations | ||
| Transaction price allocated to remaining performance obligations | 2,318 | 2,399 |
| The 12-month period ending two years hence | ||
| Disclosure of transaction price allocated to remaining performance obligations | ||
| Transaction price allocated to remaining performance obligations | 913 | 972 |
| Thereafter | ||
| Disclosure of transaction price allocated to remaining performance obligations | ||
| Transaction price allocated to remaining performance obligations | $ 121 | $ 127 |