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Exploration and Evaluation Assets - Detailed information about exploration and evaluation assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |
Beginning balance | $ 2,436 | $ 2,579
Additions/Acquisitions | 38 | 55
Transfers to property, plant and equipment | (223) | (194)
Derecognitions and other | (1) | (3)
Foreign exchange adjustments |  | (1)
Ending balance | 2,250 | 2,436
North America |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |
Beginning balance | 2,101 | 2,258
Additions/Acquisitions | 30 | 40
Transfers to property, plant and equipment | (73) | (194)
Derecognitions and other | (1) | (3)
Foreign exchange adjustments |  | 0
Ending balance | 2,057 | 2,101
North Sea |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |
Beginning balance | 0 | 0
Additions/Acquisitions | 0 | 0
Transfers to property, plant and equipment | 0 | 0
Derecognitions and other | 0 | 0
Foreign exchange adjustments |  | 0
Ending balance | 0 | 0
Offshore Africa |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |
Beginning balance | 83 | 69
Additions/Acquisitions | 8 | 15
Transfers to property, plant and equipment | 0 | 0
Derecognitions and other | 0 | 0
Foreign exchange adjustments |  | (1)
Ending balance | 91 | 83
Oil Sands Mining and Upgrading |  |
Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Line Items] |  |
Beginning balance | 252 | 252
Additions/Acquisitions | 0 | 0
Transfers to property, plant and equipment | (150) | 0
Derecognitions and other | 0 | 0
Foreign exchange adjustments |  | 0
Ending balance | $ 102 | $ 252

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- Definition [Line Items] for Disclosure Of Detailed Information About Exploration For And Evaluation Of Mineral Resources [Table] + References No definition available. + Details
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- Definition Disposals, Exploration For And Evaluation Of Mineral Resources + References No definition available. + Details
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- Definition Increase (Decrease) Through Net Exchange Differences, Exploration For And Evaluation Of Mineral Resources + References No definition available. + Details
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- Definition The amount of assets 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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