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Capital Disclosures - Schedule of Debt to Book Capitalization Ratio (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Corporate information and statement of IFRS compliance [abstract] |  |  |  |
Long-term debt | $ 10,799 | $ 11,445 |  |
Less: cash and cash equivalents | 877 | 920 | $ 744 | $ 184
Long-term debt, net | 9,922 | 10,525 |  |
Total shareholders’ equity | $ 39,832 | $ 38,175 | $ 36,945 |
Debt to book capitalization | 20.00% | 22.00% |  |

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