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Income Taxes - Summary of Movements in Deferred Tax Assets and Liabilities (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	$ 422	$ 53	$ (139)
Property, plant and equipment and exploration and evaluation assets
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	443	196	(334)
Lease assets
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	(22)	1	(15)
Unrealized foreign exchange on long-term debt
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	(86)	28	(81)
Unrealized risk management activities
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	(1)	0	(12)
Asset retirement obligations
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	(279)	(292)	(74)
Lease liabilities
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	26	(3)	11
Share-based compensation
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	(4)	2	(11)
Loss carryforwards
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	381	235	618
Investments
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	(54)	(2)	21
Investment in North West Redwater Partnership
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	4	1	53
Deferred PRT
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	58	86	(441)
Taxable PRT for corporate income tax
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	(98)	(214)	176
Other
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax expense (recovery)	$ 54	$ 15	$ (50)