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Derivative and Hedging Instruments - Summary of Recognized Gains Losses on Derivatives and Hedged Items in Fair Value Hedges in Investment Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) recognized on derivatives | $ (460) | $ 832
Fair value hedges [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) recognized on derivatives | 11 | (17)
Gains (losses) recognized for hedged items | (9) | 18
Ineffectiveness recognized in investment income | 2 | 1
Fair value hedges [Member] | Interest rate swaps [Member] | Fixed rate assets [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) recognized on derivatives | 1 | 2
Gains (losses) recognized for hedged items | (1) | (3)
Ineffectiveness recognized in investment income |  | (1)
Fair value hedges [Member] | Interest rate swaps [Member] | Fixed rate liabilities [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) recognized on derivatives | 3 | (17)
Gains (losses) recognized for hedged items | (3) | 17
Fair value hedges [Member] | Foreign currency swaps [Member] | Fixed rate assets [Member] |  |
Disclosure of detailed information about hedges [Line Items] |  |
Gains (losses) recognized on derivatives | 7 | (2)
Gains (losses) recognized for hedged items | (5) | 4
Ineffectiveness recognized in investment income | $ 2 | $ 2

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24B_a_iv&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24B_b_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The gain (loss) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2018-03-16 + Details
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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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