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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, 2023
Dec. 31, 2022
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities $ 716,962 $ 668,764
US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 548,424 513,152
Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 168,538 155,612
Insurance contract liabilities [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 481,994 464,392
Insurance contract liabilities [Member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 327,458 322,265
Insurance contract liabilities [Member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 154,536 142,127
Investment contract liabilities [member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 275,217 248,425
Investment contract liabilities [member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 260,046 233,460
Investment contract liabilities [member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 15,171 14,965
Reinsurance assets [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities 40,249 (44,053)
Reinsurance assets [Member] | US and Canada [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities (39,080) (42,573)
Reinsurance assets [Member] | Asia and Other [Member]    
Disclosure of Concentration Risk [Line items]    
Concentration risk of liabilities $ (1,169) $ (1,480)