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Debt and Capital Structure - Summary of Net Debt to Capitalization (Details) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Borrowings [abstract] |  |  |  |
Net Debt | $ 5,255 | $ 4,614 |  |
Shareholders’ Equity | 28,374 | 29,754 | $ 29,591 | $ 28,698
Capitalization | $ 33,629 | $ 34,368 |  |
Net Debt to Capitalization (percent) | 16.00% | 13.00% |  |

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