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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, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Borrowings [abstract] |  |  |  |
Net debt | $ 11,024 | $ 7,184 |  |
Shareholders’ Equity | 24,373 | 16,707 | $ 17,032 | $ 19,201
Debt and Shareholders' Equity, Net | $ 35,397 | $ 23,891 |  |
Net Debt to Capitalization | 31.00% | 30.00% |  |

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