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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 CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedges [Line Items]
Gains (losses) recognized on derivatives	CAD 832	CAD 145
Fair value hedges [Member]
Disclosure of detailed information about hedges [Line Items]
Gains (losses) recognized on derivatives	(17)	(53)
Gains (losses) recognized for hedged items	18	33
Ineffectiveness recognized in investment income	1	(20)
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	2	(52)
Gains (losses) recognized for hedged items	(3)	30
Ineffectiveness recognized in investment income	(1)	(22)
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	(17)	(1)
Gains (losses) recognized for hedged items	17	1
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	(2)
Gains (losses) recognized for hedged items	4	2
Ineffectiveness recognized in investment income	CAD 2	CAD 2

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- Definition

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+ References

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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

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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

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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
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