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Insurance and Reinsurance Contract Assets and Liabilities - Summary of Reporting Segment of Composition of Insurance and Reinsurance Contract Held Assets and Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2022
Dec. 31, 2021
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Insurance contract assets $ 145 $ 673 $ 972  
Insurance contract liabilities 367,996 354,849 405,621  
Reinsurance contract held assets 42,651 45,871 52,829  
Reinsurance contract held liabilities 2,831 2,391 $ 2,079  
Net insurance and reinsurance contract held liabilities [Abstract]        
Net insurance and reinsurance contract held liabilities 442,174 420,912    
Insurance contract asset and liabilities [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Insurance contract assets (145) (673)   $ (972)
Insurance contract liabilities 367,996 354,849   405,621
Insurance contract liabilities for account of segregated fund holders 114,143 110,216   130,836
Net insurance contract liabilities 481,994 464,392   535,485
Net insurance and reinsurance contract held liabilities [Abstract]        
Net insurance contract liabilities 481,994 464,392   535,485
Insurance contract asset and liabilities [member] | Insurance contract balances [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Insurance contract assets (145) (664)    
Insurance contract liabilities 368,816 355,645    
Insurance contract liabilities for account of segregated fund holders 114,143 110,216    
Net insurance contract liabilities 482,814 465,197    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net insurance contract liabilities 482,814 465,197    
Insurance contract asset and liabilities [member] | Total [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Insurance contract assets   (9)    
Insurance contract liabilities (820) (796)    
Net insurance contract liabilities (820) (805)    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net insurance contract liabilities (820) (805)    
Insurance contract asset and liabilities [member] | Corporate and Other [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Insurance contract assets (4)      
Insurance contract liabilities (781) 163    
Net insurance contract liabilities (785) 163    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net insurance contract liabilities (785) 163    
Insurance contract asset and liabilities [member] | Asia [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Insurance contract assets (108) (527)    
Insurance contract liabilities 131,729 121,105    
Insurance contract liabilities for account of segregated fund holders 22,696 21,005    
Net insurance contract liabilities 154,317 141,583    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net insurance contract liabilities 154,317 141,583    
Insurance contract asset and liabilities [member] | Canada [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Insurance contract assets (33) (81)    
Insurance contract liabilities 80,169 74,876    
Insurance contract liabilities for account of segregated fund holders 36,085 35,695    
Net insurance contract liabilities 116,221 110,490    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net insurance contract liabilities 116,221 110,490    
Insurance contract asset and liabilities [member] | U.S. [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Insurance contract assets   (56)    
Insurance contract liabilities 157,699 159,501    
Insurance contract liabilities for account of segregated fund holders 55,362 53,516    
Net insurance contract liabilities 213,061 212,961    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net insurance contract liabilities 213,061 212,961    
Reinsurance contracts held asset and liabilities [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Reinsurance contract held assets 42,651 45,871   52,829
Reinsurance contract held liabilities (2,831) (2,391)   (2,079)
Net reinsurance contract held assets 39,820 43,480   50,750
Net insurance and reinsurance contract held liabilities [Abstract]        
Net reinsurance contract held assets (39,820) (43,480)   $ (50,750)
Reinsurance contracts held asset and liabilities [member] | Corporate and Other [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Reinsurance contract held assets (248) 425    
Reinsurance contract held liabilities 5      
Net reinsurance contract held assets (243) 425    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net reinsurance contract held assets 243 (425)    
Reinsurance contracts held asset and liabilities [member] | Asia [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Reinsurance contract held assets 3,540 3,306    
Reinsurance contract held liabilities (1,909) (1,462)    
Net reinsurance contract held assets 1,631 1,844    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net reinsurance contract held assets (1,631) (1,844)    
Reinsurance contracts held asset and liabilities [member] | Canada [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Reinsurance contract held assets 1,922 1,756    
Reinsurance contract held liabilities (913) (911)    
Net reinsurance contract held assets 1,009 845    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net reinsurance contract held assets (1,009) (845)    
Reinsurance contracts held asset and liabilities [member] | U.S. [member]        
Disclosure of composition of insurance contract asset and liabilities and reinsurance contract held assets and liabilities by the reporting segment [Line Items]        
Reinsurance contract held assets 37,437 40,384    
Reinsurance contract held liabilities (14) (18)    
Net reinsurance contract held assets 37,423 40,366    
Net insurance and reinsurance contract held liabilities [Abstract]        
Net reinsurance contract held assets $ (37,423) $ (40,366)