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Debt and Capital Structure - Summary of Net Debt to Capitalization (Detail) - CAD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
Borrowings [abstract] |  |  |  |
Net Debt | $ 5,976 | $ 4,282 |  |
Shareholders’ Equity | 28,814 | 27,576 | $ 27,762 | $ 23,596
Capitalization | $ 34,790 | $ 31,858 |  |
Net Debt to Capitalization | 17.00% | 13.00% |  |

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