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Risk Management - Summary of Gross Carrying Amount of Financial Instruments Subject to Credit Exposure (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of external credit grades [Line Items]    
Credit exposure $ 380,464 $ 398,863
Mortgages [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 54,638 52,014
Private placements [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 47,057 42,842
Policy loans [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 6,894 6,397
Loans to Bank clients [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 2,781 2,506
Derivative Assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 8,588 17,503
Accrued investment income [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 2,813 2,641
Reinsurance assets [member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 47,712 44,579
Other financial assets [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 6,077 6,242
FVTPL [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 170,273 189,722
AFS [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure 32,220 33,097
Other [Member]    
Disclosure of external credit grades [Line Items]    
Credit exposure $ 1,411 $ 1,320