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Property Plant And Equipment - Segment breakup - (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | CAD 73,493.0 | CAD 71,259.0 |
Assets under construction and not subject to depreciation | 15,900.0 | 16,000.0 |
Finance leases | 1,319.0 | 1,134.0 |
Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 56,961.0 | 54,541.0 |
Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 8,017.0 | 8,038.0 |
Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 8,231.0 | 8,378.0 |
Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 114,848.0 | 107,678.0 | CAD 93,712.0
Cost | Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 79,625.0 | 73,882.0 |
Cost | Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 21,007.0 | 20,058.0 |
Cost | Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 13,137.0 | 12,741.0 |
Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (41,355.0) | (36,419.0) | (32,561.0)
Accumulated provision | Oil Sands |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (22,664.0) | (19,341.0) |
Accumulated provision | Exploration and Production |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (12,990.0) | (12,020.0) |
Accumulated provision | Refining and Marketing |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (4,906.0) | (4,363.0) |
Oil and Gas properties |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 18,234.0 | 18,079.0 |
Oil and Gas properties | Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 36,209.0 | 34,141.0 | 32,635.0
Oil and Gas properties | Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (17,975.0) | (16,062.0) | (14,442.0)
Plant and Equipment |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 55,259.0 | 53,180.0 |
Plant and Equipment | Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 78,639.0 | 73,537.0 | 61,077.0
Plant and Equipment | Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | (23,380.0) | (20,357.0) | CAD (18,119.0)
Corporate Energy Trading And Eliminations |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 284.0 | 302.0 |
Corporate Energy Trading And Eliminations | Cost |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | 1,079.0 | 997.0 |
Corporate Energy Trading And Eliminations | Accumulated provision |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Property, plant and equipment.. | CAD (795.0) | CAD (695.0) |

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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 2017-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_37&doctype=Standard -URIDate 2017-03-09 + 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 liabilities related to finance leases. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2019-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_55&doctype=Standard&book=B -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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