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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 | Sep. 30, 2025 | Dec. 31, 2024
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Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments net | $ 64 | $ 7
Level 2 of fair value hierarchy |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments | 7 | 2
Fair value of derivative financial instruments net | 64 | 7
Level 3 of fair value hierarchy |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments | $ 57 | $ 5

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