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PROPERTY, PLANT AND EQUIPMENT - Segment breakup - (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | $ 72,640 | $ 72,978 | $ 74,245 |
Assets under construction and not subject to depreciation | 5,600 |  | 4,700 |
Oil Sands |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 54,665 |  | 57,641 |
Exploration and Production |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 7,578 |  | 7,792 |
Refining and Marketing |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 9,574 |  | 8,535 |
Cost |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 125,164 |  | 116,874 | $ 114,848
Cost | Oil Sands |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 85,246 |  | 80,295 |
Cost | Exploration and Production |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 22,876 |  | 21,867 |
Cost | Refining and Marketing |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 15,342 |  | 13,627 |
Accumulated provision |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | (52,524) |  | (42,629) | (41,355)
Accumulated provision | Oil Sands |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | (30,581) |  | (22,654) |
Accumulated provision | Exploration and Production |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | (15,298) |  | (14,075) |
Accumulated provision | Refining and Marketing |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | (5,768) |  | (5,092) |
Oil and Gas properties |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 18,207 |  | 18,062 |
Oil and Gas properties | Cost |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 40,596 |  | 37,845 | 36,209
Oil and Gas properties | Accumulated provision |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | (22,389) |  | (19,783) | (17,975)
Plant and Equipment |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 54,433 |  | 56,183 |
Plant and Equipment | Cost |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 84,568 |  | 79,029 | 78,639
Plant and Equipment | Accumulated provision |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | (30,135) |  | (22,846) | $ (23,380)
Corporate Energy Trading And Eliminations |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 823 |  | 277 |
Corporate Energy Trading And Eliminations | Cost |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | 1,700 |  | 1,085 |
Corporate Energy Trading And Eliminations | Accumulated provision |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |
Property, plant and equipment.. | $ (877) |  | $ (808) |

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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 2019-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_37&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Details
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