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Invested Assets and Investment Income - Summary of Fair Values and the Fair Value Hierarchy (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Carrying value [Member]    
Disclosure of financial assets [Line Items]    
Carrying value $ 117,897 $ 112,233
Carrying value [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 52,014 50,207
Carrying value [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 42,842 40,756
Carrying value [Member] | Policy loans [member]    
Disclosure of financial assets [Line Items]    
Carrying value 6,397 6,398
Carrying value [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 2,506 1,976
Carrying value [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 1,812 1,850
Carrying value [Member] | Public bonds HTM [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1,320  
Carrying value [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Carrying value 11,006 11,046
Fair value [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 126,274 125,420
Fair value [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 54,089 54,230
Fair value [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 47,276 47,890
Fair value [Member] | Policy loans [member]    
Disclosure of financial assets [Line Items]    
Total fair value 6,397 6,398
Fair value [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 2,503 1,982
Fair value [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 3,024 3,017
Fair value [Member] | Public bonds HTM [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1,320  
Fair value [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 11,665 11,903
Level 1 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 120 128
Level 1 [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 120 128
Level 2 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 52,330 49,778
Level 2 [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 42,110 41,398
Level 2 [Member] | Policy loans [member]    
Disclosure of financial assets [Line Items]    
Total fair value 6,397 6,398
Level 2 [Member] | Loans to Bank clients [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 2,503 1,982
Level 2 [Member] | Public bonds HTM [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 1,320  
Level 3 [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 73,824 75,514
Level 3 [Member] | Mortgages [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 54,089 54,230
Level 3 [Member] | Private placements [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 5,166 6,492
Level 3 [Member] | Real estate own use property [Member]    
Disclosure of financial assets [Line Items]    
Total fair value 3,024 3,017
Level 3 [Member] | Other invested assets [Member]    
Disclosure of financial assets [Line Items]    
Total fair value $ 11,545 $ 11,775