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Risk Management - Impact of Fluctuating Commodity Prices and Interest Rates on Company's Open Risk Management Positions (Detail) - Currency risk $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($) $ / $	Dec. 31, 2023 CAD ($)
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]
Increase	$ 196	$ 197
Decrease	$ (196)	$ (197)
Canadian to U.S. Dollar Exchange Rate
Disclosure of Nature and Extent of Risks Arising from Financial Instruments [Line Items]
Sensitivity Range \| $ / $	0.05