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Derivative and Hedging Instruments - Net Derivative Significant Unobservable Inputs Used in Fair Value Measurement (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Roll forwards for net derivative contracts measured at fair value using significant unobservable inputs abstract |  |
Balance at the beginning of the year | $ 769 | $ 163
Net income | (666) | 1,082
OCI | (48) | (9)
Purchases | 12 | 22
Settlements | 18 | (103)
Into Level 3 | 9 |
Out of Level 3 | (13) | (363)
Currency movement | 25 | (23)
Balance at the end of the year | 106 | 769
Change in unrealized gains (losses) on instruments still held | $ (460) | $ 832

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- Definition The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Currency movement of multiple significant unobservable inputs on derivative instruments. + References No definition available. + Details
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- Definition Derivative fair value amount. + References No definition available. + Details
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- Definition Disclosure of Roll forwards for net derivative contracts measured at fair value using significant unobservable inputs. + References No definition available. + Details
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- Definition Net realized unrealized gains (losses) on derivative investment income. + References No definition available. + Details
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- Definition Net realized unrealized gains losses on derivative other comprehensive income. + References No definition available. + Details
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- Definition Purchases of multiple significant unobservable inputs on derivative instruments. + References No definition available. + Details
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- Definition Settlements multiple significant unobservable inputs on derivative instruments. + References No definition available. + Details
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- Definition Transfers Into Level 3 Of Fair Value Hierarchy Financial Assets And Liabilities + References No definition available. + Details
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- Definition Transfers Out Of Level 3 Of Fair Value Hierarchy Financial Assets And Liabilities + References No definition available. + Details
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