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Long-term debt - Detailed Information About In Financing Expense (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Statement [Line Items] |  |  |  |
Interest on long-term-debt | $ 5 | $ 8 | $ 19 | $ 22
Advisor fees | 2 | 2 | 8 | 3
Unwinding discount on lease liabilities | 0 | 2 | 1 | 6
Finance costs | $ 7 | $ 12 | $ 28 | $ 31

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- Definition The amount of costs associated with financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of fees paid or payable for professional services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Interest On Long Term Borrowings. + References No definition available. + Details
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- Definition Unwinding Discount On Lease Liabilities. + References No definition available. + Details
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