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Risk Management - Schedule of Risk Concentrations (Detail) - Asset classes and individual investment risks [Member] - CAD CAD in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Debt securities and private placements rated as investment grade BBB or higher	98.00%	97.00%
Government debt securities as a per cent of total debt securities	39.00%	43.00%
Government private placements as a per cent of total private placements	10.00%	10.00%
Highest exposure to a single non-government debt security and private placement issuer	CAD 1,044	CAD 1,010
Largest single issuer as a per cent of the total equity portfolio	2.00%	3.00%
Income producing commercial office properties (2017 - 64% of real estate, 2016 - 65%)	CAD 8,836	CAD 9,200
Largest concentration of mortgages and real estate(2) - Ontario Canada (2017 - 25%, 2016 - 24%)	CAD 14,779	CAD 13,882

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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Debt securities and private placements investment percentage.

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Government debt securities percentage.

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Government private placements percentage.

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Income producing commercial office properties.

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Largest single issuer of equity portfolio percentage.

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Maximum concentration of mortgages and real estate.

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Maximum exposure to single nongovernment debt security and private placement issuer.

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