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Debt and Capital Structure - Summary of Net Debt to Capitalization (Detail) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Borrowings [abstract] |  |  |
Net Debt | $ 5,060 | $ 4,282 |
Shareholders’ Equity | 28,698 | 27,576 | $ 23,596
Capitalization | $ 33,758 | $ 31,858 |
Net Debt to Capitalization (percent) | 15.00% | 13.00% |

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