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IFRS 7 Disclosures - Summary of Account Balances by Investment Category (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees $ 111,037 $ 105,811
Equity funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 52,528 47,348
Balanced funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 43,783 42,414
Bond funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 10,965 11,944
Money market funds [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees 1,844 2,113
Other fixed interest rate investments [Member]    
Investment Categories For Variable Contracts With Guarantees [line items]    
Investments for variable contracts with guarantees $ 1,917 $ 1,992