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Property Plant And Equipment - Segment breakup - (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | $ 74,245 | $ 73,493 |
Assets under construction and not subject to depreciation | 4,700 | 15,900 |
Finance lease assets | 1,400 | 1,400 |
Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 57,641 | 56,961 |
Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 7,792 | 8,017 |
Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 8,535 | 8,231 |
Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 116,874 | 114,848 | $ 107,678
Cost | Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 80,295 | 79,625 |
Cost | Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 21,867 | 21,007 |
Cost | Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 13,627 | 13,137 |
Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (42,629) | (41,355) | (36,419)
Accumulated provision | Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (22,654) | (22,664) |
Accumulated provision | Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (14,075) | (12,990) |
Accumulated provision | Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (5,092) | (4,906) |
Oil and Gas properties |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 18,062 | 18,234 |
Oil and Gas properties | Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 37,845 | 36,209 | 34,141
Oil and Gas properties | Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (19,783) | (17,975) | (16,062)
Plant and Equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 56,183 | 55,259 |
Plant and Equipment | Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 79,029 | 78,639 | 73,537
Plant and Equipment | Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (22,846) | (23,380) | $ (20,357)
Corporate Energy Trading And Eliminations |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 277 | 284 |
Corporate Energy Trading And Eliminations | Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 1,085 | 1,079 |
Corporate Energy Trading And Eliminations | Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | $ (808) | $ (795) |

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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 2018-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_37&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of assets recognised by the entity, which are leased under finance leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2018-01-01 -Paragraph 31 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_31_a&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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