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Debt - Finance Lease Liabilities - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about borrowings [line items] |  |
Finance lease liabilities | $ 338 | $ 313
Fort Hills Energy Limited Partnership [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Finance lease liabilities | $ 207 | $ 229
Lease term | 25 years | 25 years
Lease renewal option periods | Four additional five-year 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 | $ 613 | $ 406

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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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-02&anchor=para_55&doctype=Standard&book=b -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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- Details
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- Details
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