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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, 2023 | Dec. 31, 2022
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Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments net | $ (27) | $ 46
Level 2 of fair value hierarchy |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments | (48) | (44)
Fair value of derivative financial instruments net | (27) | 46
Level 3 of fair value hierarchy |  |
Disclosure Of Levels Of Fair Value Hierarchy [Line Items] |  |
Fair value of derivative financial instruments | $ 21 | $ 90

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