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Finance Income and Finance Expense - Schedule of Finance Income and Finance Expense (Detail) - CAD CAD in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Finance income |  |
Investment income | CAD 17 | CAD 16
Total finance income | 17 | 16
Finance expense |  |
Debt interest | 385 | 476
Letters of credit and standby fees | 70 | 62
Net interest expense on retirement benefit plans | 12 | 14
Accretion on decommissioning and restoration provisions | 81 | 55
Other | 14 | 13
Finance expense gross | 562 | 620
Less capitalized borrowing costs | (333) | (266)
Total finance expense | CAD 229 | CAD 354

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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 2017-01-01 -Paragraph 82 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_82_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of income associated with interest and other financing activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of investment income, such as interest and dividends. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Accretion on decommissioning and restoration provisions. + References No definition available. + Details
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- Definition Finance expense. + References No definition available. + Details
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- Definition Finance expenses. + References No definition available. + Details
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- Definition Net interest expense on retirement benefit plans. + References No definition available. + Details
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