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Income Taxes - Summary of Movements in Deferred Tax Assets and Liabilities (Details) - CAD ($) $ in Millions | 12 Months Ended
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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)

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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2024-03-27 + Details
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