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Long Term Debt - Additional Information (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about borrowings [line items] |  |
Interest expense on borrowings | $ 233 | $ 231
Level 2 |  |
Disclosure of detailed information about borrowings [line items] |  |
Long term borrowings fair value | $ 5,741 | $ 5,525

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