Long Term Debt - Aggregate Maturities of Long-Term Debt (Details) - CAD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of detailed information about borrowings [line items] | ||
| Long-term debt | $ 7,685 | $ 6,629 |
| Less than 1 year | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Long-term debt | 1,741 | 0 |
| 1 to 3 years | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Long-term debt | 958 | 2,829 |
| 3 to 5 years | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Long-term debt | 0 | 0 |
| Over 5 years | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Long-term debt | $ 4,986 | $ 3,800 |