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Risk Management - Summary of Gross Carrying Amount of Financial Instruments Subject to Credit Exposure (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of external credit grades [Line Items]    
Credit exposure $ 398,863 $ 400,369
Mortgages [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 52,014 50,207
Private placements [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 42,842 40,756
Policy loans [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 6,397 6,398
Loans to Bank clients [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 2,506 1,976
Derivative Assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 17,503 27,793
Accrued investment income [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 2,641 2,523
Reinsurance assets [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 44,579 45,836
Other financial assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 6,242 6,156
FVTPL [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 189,722 183,061
AFS [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 33,097 $ 35,663
Other [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure $ 1,320