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Derivative and Hedging Instruments - Net Derivative Significant Unobservable Inputs Used in Fair Value Measurement (Detail) - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Roll forwards for net derivative contracts measured at fair value using significant unobservable inputs abstract
Balance at the beginning of the year	CAD 163	CAD 350
Net income	1,082	47
OCI	(9)	40
Purchases	22	373
Settlements	(103)	(522)
Into Level 3	0	0
Out of Level 3	(363)	(116)
Currency movement	(23)	(9)
Balance at the end of the year	769	163
Change in unrealized gains (losses) on instruments still held	CAD 832	CAD 145

X

- 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 2017-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_85&doctype=Standard
-URIDate 2017-03-09

+ Details

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- Definition

Currency movement of multiple significant unobservable inputs on derivative instruments.

+ References

No definition available.

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X

- Definition

Derivative fair value amount.

+ References

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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.

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- Definition

Net realized unrealized gains (losses) on derivative investment income.

+ References

No definition available.

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- Definition

Net realized unrealized gains losses on derivative other comprehensive income.

+ References

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- Definition

Purchases of multiple significant unobservable inputs on derivative instruments.

+ References

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- Definition

Settlements multiple significant unobservable inputs on derivative instruments.

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- Definition

Transfers Into Level 3 Of Fair Value Hierarchy Financial Assets And Liabilities

+ References

No definition available.

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- Definition

Transfers Out Of Level 3 Of Fair Value Hierarchy Financial Assets And Liabilities

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