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Capital Disclosures - Schedule of Debt to Book Capitalization Ratio (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Corporate information and statement of IFRS compliance [abstract] |  |  |  |
Long-term debt | $ 18,819 | $ 10,799 |  |
Less: cash and cash equivalents | 131 | 877 | $ 920 | $ 744
Long-term debt, net | 18,688 | 9,922 |  |
Total shareholders’ equity | $ 39,468 | $ 39,832 | $ 38,175 |
Debt to book capitalization | 32.00% | 20.00% |  |

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