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Risk Management - Schedule of Geographic Concentration of Insurance and Investment Contract Liabilities, Including Embedded Derivatives (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities $ 327,401 $ 350,909
US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 205,407 228,284
Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 121,994 122,625
Gross insurance contract liabilities [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 375,113 395,488
Gross insurance contract liabilities [Member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 251,305 271,090
Gross insurance contract liabilities [Member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 123,808 124,398
Reinsurance assets [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities (47,712) (44,579)
Reinsurance assets [Member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities (45,898) (42,806)
Reinsurance assets [Member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities $ (1,814) $ (1,773)