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Risk Management - Schedule of Risk Concentrations (Detail) - Asset classes and individual investment risks [Member] - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
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 96.00% 97.00%
Government debt securities as a per cent of total debt securities 36.00% 36.00%
Government private placements as a per cent of total private placements 10.00% 11.00%
Highest exposure to a single non-government debt security and private placement issuer $ 1,006 $ 1,167
Largest single issuer as a per cent of the total equity portfolio 2.00% 2.00%
Income producing commercial office properties (2022 – 41% of real estate, 2021 – 47%) $ 5,486 $ 6,244
Largest concentration of mortgages and real estate(2) – Ontario Canada (2022 – 27%, 2021 – 28%) $ 18,343 $ 18,253