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Debt and Capital Structure - Summary of Net Debt to Capitalization (Detail) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Borrowings [abstract] |  |  |
Net Debt | $ 4,614 | $ 5,060 |
Shareholders’ Equity | 29,754 | 28,698 | $ 27,576
Capitalization | $ 34,368 | $ 33,758 |
Net Debt to Capitalization (percent) | 13.00% | 15.00% |

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