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Risk Management - Schedule of Risk Concentrations (Detail) - Asset classes and individual investment risks [Member] - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
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% | 98.00%
Government debt securities as a per cent of total debt securities | 38.00% | 39.00%
Government private placements as a per cent of total private placements | 11.00% | 10.00%
Highest exposure to a single non-government debt security and private placement issuer | $ 1,013 | $ 1,044
Largest single issuer as a per cent of the total equity portfolio | 2.00% | 2.00%
Income producing commercial office properties (2018 - 55% of real estate, 2017 - 64%) | $ 7,065 | $ 8,836
Largest concentration of mortgages and real estate(2) - Ontario Canada (2018 - 26%, 2017 - 25%) | $ 16,092 | $ 14,779

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- Details
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