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Debt - Finance Lease Liabilities - Additional Information (Detail) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of detailed information about borrowings [line items] |  |
Finance lease liabilities | CAD 313 | CAD 115
Fort Hills Energy Limited Partnership [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Finance lease liabilities | CAD 207 |
Lease term | 25 years |
Lease renewal option periods | Four additional five-year periods |
Property plant and equipment under finance leases [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Carrying amount of assets under finance leases | CAD 406 | CAD 220

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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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Period Type: | instant

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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 2017-01-01 -Paragraph 31 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition Description of finance lease renewal options. + References No definition available. + Details
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- Definition Description of lease agreements term. + References No definition available. + Details
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- Details
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- Details
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