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Non-Operating Income (Expense) - Schedule of Non-Operating Income (Expense) (Detail) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Non operating income expense [abstract] |  |
Foreign exchange gains | CAD 5 | CAD 46
Gain on debt prepayment options (Note 28(b)) | 51 | 113
Gain on sale of investments | 9 | 34
Gain (loss) on debt repurchases (Note 18(a) and Note 18(b)) | (216) | 49
Provision for marketable securities |  | (3)
Total non operating expense | CAD (151) | CAD 239

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- Definition The gains (losses) on disposals of investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_d&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=sect_AStatementofcashflowsforanentityotherthanafinancialinstitution&doctype=Illustrative%20Examples -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2017-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2017-03-01&anchor=para_52_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Gain (loss) on debt repurchases. + References No definition available. + Details
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- Definition Gain on debt prepayment options. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Non Operating Income Expense1 + References No definition available. + Details
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- Definition Non operating income expense [abstract] + References No definition available. + Details
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- Definition Provision for marketable securities. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration