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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
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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