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Income Taxes - Components of Income Tax Expense (Recovery) Recognized in Other Comprehensive Income ("OCI") (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Major components of tax expense (income) [abstract] |  |
Current income tax expense (recovery) | $ 2 | $ 116
Deferred income tax expense (recovery) | (148) | 320
Total income tax expense (recovery) | $ (146) | $ 436

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- Definition The amount of income tax relating to amounts recognised in other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_90&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Current tax relating to items credited charged directly to other comprehensive income. + References No definition available. + Details
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- Definition Deferred tax relating to items credited charged directly to other comprehensive income. + References No definition available. + Details
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