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Income Taxes - Summary of Major Temporary Differences (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | $ 13,763 | $ 13,481 |  |
Deferred income tax assets | (3,580) | (3,367) |  |
Net deferred income tax liability | 10,183 | 10,114 | $ 10,220 | $ 10,144
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 | 12,172 | 11,985 |  |
Lease assets |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 336 | 336 |  |
Investments |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 54 | 56 |  |
Investment in North West Redwater Partnership |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 904 | 903 |  |
Taxable PRT for corporate income tax |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 256 | 176 |  |
Other |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax liabilities | 41 | 25 |  |
Asset retirement obligations |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (2,098) | (1,822) |  |
Lease liabilities |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (356) | (354) |  |
Share-based compensation |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (31) | (33) |  |
Loss carryforwards |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | (417) | (652) |  |
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 | (39) | (67) |  |
Deferred PRT |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred income tax assets | $ (639) | $ (439) |  |

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