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Property, Plant and Equipment - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 CAD ($) property
STORM Resources Ltd |  |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |  |
Cash consideration |  |  | $ 771,000,000
North Sea |  |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |  |
Recoverability charge, net of taxes | $ 113,000,000 | $ 651,000,000 |
Recoverability charge | 436,000,000 | 1,620,000,000 |
Deferred income tax recovery | 323,000,000 | 969,000,000 |
Oil Sands Mining and Upgrading |  |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |  |
Project costs not subject to depletion and depreciation | $ 191,000,000 | 162,000,000 |
North America Exploration And Production segment - Crude Oil And Natural Gas Properties |  |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |  |
Total purchase consideration |  | 513,000,000 |
Asset retirement obligations |  | 11,000,000 |
Deferred tax liability |  | 0 |
Gains on acquisitions of property, plant and equipment, pre-tax |  | $ 0 |
British Columbia - Gas Producing Assets And Processing Infrastructure Segment |  |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |  |
Total purchase consideration |  |  | 131,000,000
Asset retirement obligations |  |  | 58,000,000
Gains on acquisitions of property, plant and equipment, pre-tax |  |  | $ 478,000,000
Number of acquisitions | property |  |  | 2
Property, plant and equipment |  |  | $ 257,000,000
Exploration and evaluation assets |  |  | 13,000,000
Non-current liabilities recognised as of acquisition date |  |  | 65,000,000
Deferred tax assets recognised as of acquisition date |  |  | $ 462,000,000

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