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PROPERTY, PLANT AND EQUIPMENT - Segment breakup - (Details) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | $ 68,130 | $ 72,640 |
Assets under construction and not subject to depreciation | 5,000 | 5,600 |
Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 51,940 | 54,665 |
Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 6,216 | 7,578 |
Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 9,210 | 9,574 |
Corporate Energy Trading And Eliminations |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 764 | 823 |
Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 127,658 | 125,164 | $ 116,874
Cost | Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 86,999 | 85,246 |
Cost | Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 23,640 | 22,876 |
Cost | Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 15,757 | 15,342 |
Cost | Corporate Energy Trading And Eliminations |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 1,262 | 1,700 |
Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (59,528) | (52,524) | (42,629)
Accumulated provision | Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (35,059) | (30,581) |
Accumulated provision | Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (17,424) | (15,298) |
Accumulated provision | Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (6,547) | (5,768) |
Accumulated provision | Corporate Energy Trading And Eliminations |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (498) | (877) |
Oil and Gas properties |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 17,236 | 18,207 |
Oil and Gas properties | Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 42,709 | 40,596 | 37,845
Oil and Gas properties | Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (25,473) | (22,389) | (19,783)
Plant and Equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 50,894 | 54,433 |
Plant and Equipment | Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 84,949 | 84,568 | 79,029
Plant and Equipment | Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | $ (34,055) | $ (30,135) | $ (22,846)

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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 2020-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_37&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + 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 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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