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Insurance and Reinsurance Contract Assets and Liabilities - Insurance Revenue By Transition Method (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue $ 26,592 $ 23,972
Asia    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 5,809 5,056
Canada    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 9,296 8,619
U.S.    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 11,403 10,194
Corporate and Other    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 84 103
Contracts under the fair value method    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 16,912 15,892
Contracts under the fair value method | Asia    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 2,629 2,499
Contracts under the fair value method | Canada    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 3,322 3,288
Contracts under the fair value method | U.S.    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 10,975 10,123
Contracts under the fair value method | Corporate and Other    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue (14) (18)
Contracts under the full retrospective method    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 692 731
Contracts under the full retrospective method | Asia    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 489 531
Contracts under the full retrospective method | Canada    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 62 48
Contracts under the full retrospective method | U.S.    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 141 152
Contracts under the full retrospective method | Corporate and Other    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 0 0
Other contracts    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 8,988 7,349
Other contracts | Asia    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 2,691 2,026
Other contracts | Canada    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 5,912 5,283
Other contracts | U.S.    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue 287 (81)
Other contracts | Corporate and Other    
Disclosure of analysis of insurance revenue [line items]    
Insurance revenue $ 98 $ 121