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Property, Plant and Equipment - by segment (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Property, Plant and Equipment |  |  |
Property, plant and equipment | $ 62,654 | $ 65,546 |
Assets under construction and not subject to depreciation | 6,300 | 4,600 |
Oil Sands |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 47,313 | 49,878 |
Exploration and Production |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 5,181 | 5,496 |
Refining and Marketing |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 9,666 | 9,393 |
Corporate and Eliminations |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 494 | 779 |
Cost |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 127,209 | 126,559 | $ 127,658
Cost | Oil Sands |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 92,601 | 87,849 |
Cost | Exploration and Production |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 16,541 | 21,495 |
Cost | Refining and Marketing |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 17,101 | 15,989 |
Cost | Corporate and Eliminations |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | 966 | 1,226 |
Accumulated provision |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | (64,555) | (61,013) | $ (59,528)
Accumulated provision | Oil Sands |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | (45,288) | (37,971) |
Accumulated provision | Exploration and Production |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | (11,360) | (15,999) |
Accumulated provision | Refining and Marketing |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | (7,435) | (6,596) |
Accumulated provision | Corporate and Eliminations |  |  |
Property, Plant and Equipment |  |  |
Property, plant and equipment | $ (472) | $ (447) |

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- Definition The amount of expenditure capitalised during the construction of non-current assets that are not yet available for use. [Refer: Non-current assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 37 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_37&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2022-03-24 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_e&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_a&doctype=Standard -URIDate 2022-03-24 + Details
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