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Risk Management - Summary of Account Balances by Investment Category (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees $ 93,766 $ 92,085
Equity funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 45,593 42,506
Balanced funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 35,801 36,290
Bond funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 8,906 9,336
Money market funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 1,559 1,924
Other fixed interest rate investments [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees $ 1,907 $ 2,029