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Risk Management - Schedule of Risk Concentrations (Parenthetical) (Detail) | Dec. 31, 2022 | Dec. 31, 2021
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Asset classes and individual investment risks [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Income producing commercial office properties, percentage | 41.00% | 47.00%
Ontario Canada [Member] | Asset classes and individual investment risks [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Largest concentration of mortgages and real estate, percentage | 27.00% | 28.00%
A [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Investment grade debt securities and private placements rate | 39.00% | 39.00%
AA [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Investment grade debt securities and private placements rate | 17.00% | 17.00%
AAA [Member] |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |
Investment grade debt securities and private placements rate | 14.00% | 15.00%

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