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Supplementary Oil And Gas Information (Unaudited) - Costs Incurred in Crude Oil and Natural Gas Activities (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Proved | $ 0 | $ 524 | $ 1,371
Unproved | 0 | 0 | 26
Exploration | 46 | 45 | 12
Development | 5,784 | 4,766 | 4,557
Costs incurred | 5,830 | 5,335 | 5,966
North America |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Proved | 0 | 524 | 1,371
Unproved | 0 | 0 | 26
Exploration | 43 | 40 | 4
Development | 5,039 | 4,387 | 4,301
Costs incurred | 5,082 | 4,951 | 5,702
North Sea |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Proved | 0 | 0 | 0
Unproved | 0 | 0 | 0
Exploration | 0 | 0 | 0
Development | 558 | 304 | 208
Costs incurred | 558 | 304 | 208
Offshore Africa |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Proved | 0 | 0 | 0
Unproved | 0 | 0 | 0
Exploration | 3 | 5 | 8
Development | 187 | 75 | 48
Costs incurred | $ 190 | $ 80 | $ 56

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- Definition Costs Incurred, Acquisition Of Oil And Gas Properties With Proved Reserves1 + References No definition available. + Details
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- Definition Costs Incurred, Acquisition Of Unproved Oil And Gas Properties1 + References No definition available. + Details
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- Definition [Line Items] for Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Table] + References No definition available. + Details
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- Definition The amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2023-01-01 -Paragraph 24 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2023-en-r&anchor=para_24_b&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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