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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, 2020 | Dec. 31, 2019
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 | 97.00% | 98.00%
Government debt securities as a per cent of total debt securities | 37.00% | 37.00%
Government private placements as a per cent of total private placements | 11.00% | 12.00%
Highest exposure to a single non-government debt security and private placement issuer | $ 1,148 | $ 1,083
Largest single issuer as a per cent of the total equity portfolio | 2.00% | 2.00%
Income producing commercial office properties (2020 – 0% of real estate, 2019 – 56%) | $ 6,745 | $ 7,279
Largest concentration of mortgages and real estate(2) – Ontario Canada (2020 – 0%, 2019 – 27%) | $ 17,367 | $ 17,038

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- Details
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