Long Term Debt - Additional Information (Details) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of detailed information about borrowings [line items] | ||
| Interest expense on borrowings | $ 241 | $ 233 |
| Level 2 | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Long term borrowings fair value | $ 6,962 | $ 5,741 |