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Commitments and Contingencies - Schedule of Pledged Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt securities [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount $ 10,939 $ 13,150
Debt securities [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 10,431 11,944
Debt securities [Member] | Secured borrowings [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 0
Debt securities [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 307 320
Debt securities [Member] | Repurchase agreements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 201 886
Debt securities [Member] | Non-registered retirement plans in trust [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 0
Debt securities [Member] | Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 0
Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 2,901 3,071
Other [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 26 23
Other [Member] | Secured borrowings [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 2,220 2,241
Other [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 74 77
Other [Member] | Repurchase agreements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 0
Other [Member] | Non-registered retirement plans in trust [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 298 326
Other [Member] | Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount $ 283 $ 404