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Insurance and Reinsurance Contract Assets and Liabilities - Summary of Maturity Analysis and Amounts Payable on Demand (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Amounts payable on demand $ 172,684 $ 166,916
Carrying amount 249,096 233,411
Asia [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Amounts payable on demand 100,060 95,777
Carrying amount 129,117 117,737
Canada [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Amounts payable on demand 28,264 25,745
Carrying amount 56,887 52,300
U.S. [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Amounts payable on demand 44,360 45,394
Carrying amount 63,092 63,374
Insurance contract liabilities [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 1,110,645 1,032,186
Insurance contract liabilities [Member] | Less than 1 year [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 3,400 3,091
Insurance contract liabilities [Member] | 1 to 2 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 5,546 4,976
Insurance contract liabilities [Member] | 2 to 3 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 6,766 7,224
Insurance contract liabilities [Member] | 3 to 4 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 8,849 9,212
Insurance contract liabilities [Member] | 4 to 5 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 11,320 11,223
Insurance contract liabilities [Member] | Over 5 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 1,074,764 996,460
Reinsurance contracts held liabilities [member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 8,448 6,622
Reinsurance contracts held liabilities [member] | Less than 1 year [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 332 235
Reinsurance contracts held liabilities [member] | 1 to 2 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 460 237
Reinsurance contracts held liabilities [member] | 2 to 3 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 492 250
Reinsurance contracts held liabilities [member] | 3 to 4 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 592 243
Reinsurance contracts held liabilities [member] | 4 to 5 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period 475 337
Reinsurance contracts held liabilities [member] | Over 5 years [Member]    
Disclosure of maturity analysis for liquidity risk that arises from contracts within scope of IFRS 17 [line items]    
Payments due by period $ 6,097 $ 5,320