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Insurance and Reinsurance Contract Assets and Liabilities - Summary of Insurance Revenue By Transition Method (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue $ 23,972 $ 23,118
Asia [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 5,056 4,734
Canada [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 8,619 8,117
U.S. [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 10,194 10,245
Other Reporting Segments [Member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 103 22
Contracts Under the Fair Value Method [Member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 15,892 15,831
Contracts Under the Fair Value Method [Member] | Asia [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 2,499 2,656
Contracts Under the Fair Value Method [Member] | Canada [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 3,288 3,370
Contracts Under the Fair Value Method [Member] | U.S. [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 10,123 9,901
Contracts Under the Fair Value Method [Member] | Other Reporting Segments [Member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue (18) (96)
Contracts Under the Full Retrospective Method [Member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 731 864
Contracts Under the Full Retrospective Method [Member] | Asia [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 531 666
Contracts Under the Full Retrospective Method [Member] | Canada [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 48 122
Contracts Under the Full Retrospective Method [Member] | U.S. [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 152 76
Other Contracts [Member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 7,349 6,423
Other Contracts [Member] | Asia [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 2,026 1,412
Other Contracts [Member] | Canada [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 5,283 4,625
Other Contracts [Member] | U.S. [member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue (81) 268
Other Contracts [Member] | Other Reporting Segments [Member]    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue $ 121 $ 118