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Debt and Capital Structure - Summary of Net Debt to Capitalization (Detail) - CAD ($) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Borrowings [abstract] |  |  |  |
Net debt | $ 7,535 | $ 9,591 |  |
Shareholders’ Equity | 26,275 | 23,596 | $ 23,629 | $ 16,707
Debt and Shareholders' Equity, Net | $ 33,810 | $ 33,187 |  |
Net Debt to Capitalization | 22.00% | 29.00% |  |

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