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Financial Instruments - Summary of Fair Value Hierarchy for Risk Management Assets and Liabilities Carried at Fair Value (Detail) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 7 | $ 12 | $ 46
Level 2 |  |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | 2 | (6) |
Level 3 |  |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |  |
Fair value of derivative financial instruments net | $ 5 | $ 18 |

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