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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Property acquisitions, proved | $ 1,371 | $ 750 | $ 3,405
Property acquisitions, unproved | 26 | 15 | 91
Exploration | 12 | 37 | 71
Development | 4,557 | 2,536 | 5,269
Costs incurred | 5,966 | 3,338 | 8,836
North America |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Property acquisitions, proved | 1,371 | 750 | 3,405
Property acquisitions, unproved | 26 | 15 | 91
Exploration | 4 | 22 | 38
Development | 4,301 | 2,338 | 4,687
Costs incurred | 5,702 | 3,125 | 8,221
North Sea |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Property acquisitions, proved | 0 | 0 | 0
Property acquisitions, unproved | 0 | 0 | 0
Exploration | 0 | 0 | 0
Development | 208 | 104 | 349
Costs incurred | 208 | 104 | 349
Offshore Africa |  |  |
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items] |  |  |
Property acquisitions, proved | 0 | 0 | 0
Property acquisitions, unproved | 0 | 0 | 0
Exploration | 8 | 15 | 33
Development | 48 | 94 | 233
Costs incurred | $ 56 | $ 109 | $ 266

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- Definition Costs Incurred, Acquisition Of Unproved Oil And Gas Properties1 + 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 2021-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2021-en-r&anchor=para_24_b&doctype=Standard -URIDate 2021-03-24 + Details
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