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Risk Management - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 CAD	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CAD
Disclosure of Risk Management [Line Items]
Percentage of total mortgage portfolio	17.00%	17.00%	19.00%
Loaned securities included in invested assets	CAD 17,997,000,000		CAD 26,809,000,000
Reverse repurchase transactions recorded as short-term receivables	230,000,000		250,000,000
Repurchase transactions recorded as payables	CAD 228,000,000		255,000,000
Term of credit default swaps	5 years	5 years
Credit protection purchased	CAD 0		0
Mitigated exposure to credit risk	10,138,000,000		12,781,000,000
Largest single counterparty exposure without master netting agreements or the benefit of collateral held	6,760,000,000		12,031,000,000
Largest single counterparty exposure with master netting agreements or the benefit of collateral held	95,000,000		190,000,000
Maximum credit exposure related to derivatives	16,204,000,000		24,603,000,000
Reinsurance assets	CAD 30,359,000,000		CAD 34,952,000,000
Percentage ceded to reinsurers	92.00%		92.00%
Exposure to credit risk	CAD 13,855,000,000		CAD 16,600,000,000
Net exposure after offsetting agreements and benefit of fair value of collateral held	16,504,000,000		18,352,000,000
Bottom of range [Member]
Disclosure of Risk Management [Line Items]
Global retention limit | $		$ 30
Top of range [Member]
Disclosure of Risk Management [Line Items]
Global retention limit | $		$ 35
Derivatives [Member]
Disclosure of Risk Management [Line Items]
Largest single counterparty exposure without master netting agreements or the benefit of collateral held	2,629,000,000		3,891,000,000
Largest single counterparty exposure with master netting agreements or the benefit of collateral held	CAD 0		CAD 0
AA Credit Grades or Higher [Member]
Disclosure of Risk Management [Line Items]
Derivative exposure with counterparties, percentage	20.00%	20.00%	22.00%
Securities lending [Member]
Disclosure of Risk Management [Line Items]
Loaned securities included in invested assets	CAD 1,563,000,000		CAD 1,956,000,000

X

- Definition

The amount by which credit derivatives or similar instruments related to loans or receivables mitigate maximum exposure to credit risk. [Refer: Loans and receivables; Credit risk [member]; Maximum exposure to credit risk; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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- Definition

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- Definition

The maximum exposure to the credit risk of financial assets designated as measured at fair value through profit or loss. [Refer: Credit risk [member]; Maximum exposure to credit risk]

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The amount remaining after deducting the amounts subject to an enforceable master netting arrangement or similar agreement that were not set off against financial assets, from the net amount of financial assets subject to offsetting or subject to an enforceable master netting arrangement or similar agreement presented in the statement of financial position.

+ References

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- Definition

The amount of a cedant’s net contractual rights under a reinsurance contract.

+ References

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- Definition

The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent.

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- Definition

The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]

+ References

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- Definition

Credit derivative purchased credit protection.

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- Definition

Derivative exposure with counterparties percentage.

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Exposure to credit risk offset by collateral held as security.

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- Definition

Insurance retention limit.

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- Definition

Percentage ceded to reinsurers.

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Total mortgage portfolio percentage.

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Term of credit default swaps.

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