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Commitments and Contingencies - Schedule of Pledged Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt securities [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount $ 13,150 $ 6,429
Debt securities [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 11,944 5,525
Debt securities [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 320 367
Debt securities [Member] | Repurchase agreements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 886 535
Debt securities [Member] | Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount   2
Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 3,215 3,467
Other [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 23 23
Other [Member] | Secured borrowings [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 2,385 2,575
Other [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 77 78
Other [Member] | Non-registered retirement plans in trust [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 326 377
Other [Member] | Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount $ 404 $ 414