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Invested Assets and Investment Income - Summary of Fair Values and the Fair Value Hierarchy (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Carrying value [Member]    
Disclosure of financial assets [Line Items]    
Carrying value $ 38,890 $ 38,076
Carrying value [Member] | Short-term securities [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 1  
Carrying value [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 22,893 22,006
Carrying value [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 2,436 2,781
Carrying value [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 161 170
Carrying value [Member] | Public bonds HTM [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 1,372 1,411
Carrying value [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 12,027 11,708
Fair value [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 39,384 38,172
Fair value [Member] | Short-term securities [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1  
Fair value [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 22,782 21,613
Fair value [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 2,411 2,760
Fair value [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 286 326
Fair value [Member] | Public bonds HTM [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 998 1,000
Fair value [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 12,906 12,473
Level 1 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 240 72
Level 1 [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 240 72
Level 2 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 3,410 3,760
Level 2 [Member] | Short-term securities [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1  
Level 2 [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 2,411 2,760
Level 2 [Member] | Public bonds HTM [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 998 1,000
Level 3 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 35,734 34,340
Level 3 [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 22,782 21,613
Level 3 [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 286 326
Level 3 [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value $ 12,666 $ 12,401