financial instruments - Fair values Non-derivative (Details) - CAD ($) $ in Millions |
Jun. 30, 2024 |
Dec. 31, 2023 |
|---|---|---|
| Disclosure of detailed information about financial instruments | ||
| Long-term debt, excluding leases | $ 25,463 | $ 24,735 |
| Measured at amortized cost but fair value disclosed | ||
| Disclosure of detailed information about financial instruments | ||
| Long-term debt, excluding leases | 24,203 | 23,853 |
| Carrying value | ||
| Disclosure of detailed information about financial instruments | ||
| Long-term debt, excluding leases | $ 25,463 | $ 24,735 |