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Income Taxes - Summary of Major Temporary Differences (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | $ 14,299 | $ 13,763 |  |
Deferred income tax assets | (3,760) | (3,580) |  |
Net deferred income tax liability | 10,539 | 10,183 | $ 10,114 | $ 10,220
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 liabilities | 12,647 | 12,172 |  |
Lease assets |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 316 | 336 |  |
Investments |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 0 | 54 |  |
Investment in North West Redwater Partnership |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 908 | 904 |  |
Taxable PRT for corporate income tax |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 336 | 256 |  |
Other |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 92 | 41 |  |
Asset retirement obligations |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (2,437) | (2,098) |  |
Lease liabilities |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (332) | (356) |  |
Share-based compensation |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (35) | (31) |  |
Loss carryforwards |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (36) | (417) |  |
Unrealized foreign exchange loss on long-term debt |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (125) | (39) |  |
Deferred PRT |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | $ (795) | $ (639) |  |

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