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Risk Management - Risk Concentrations (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
A    
Disclosure of credit risk exposure [line items]    
Investment grade debt securities and private placements rate 37.00% 38.00%
AA    
Disclosure of credit risk exposure [line items]    
Investment grade debt securities and private placements rate 17.00% 17.00%
AAA    
Disclosure of credit risk exposure [line items]    
Investment grade debt securities and private placements rate 15.00% 15.00%
Asset classes and individual investment risks    
Disclosure of credit risk exposure [line items]    
Debt securities and private placements rated as investment grade BBB or higher 96.00% 95.00%
Government debt securities as a per cent of total debt securities 40.00% 38.00%
Government private placements as a per cent of total private placements 9.00% 10.00%
Highest exposure to a single non-government debt security or private placement issuer $ 1,121 $ 1,131
Largest single issuer as a per cent of the total equity portfolio 2.00% 2.00%
Income producing commercial office properties (2024 – 35% of real estate, 2023 – 37%) $ 4,696 $ 4,829
Largest concentration of mortgages and real estate – Ontario Canada (2024 – 28%, 2023 – 29%) $ 19,052 $ 19,003
Income producing commercial office properties percentage 35.00% 37.00%
Asset classes and individual investment risks | Ontario, Canada    
Disclosure of credit risk exposure [line items]    
Maximum concentration of mortgages and real estate, percentage 28.00% 29.00%