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Commitments and Contingencies - Schedule of Pledged Assets (Detail) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt securities [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount $ 6,429 $ 6,731
Debt securities [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 5,525 5,924
Debt securities [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 367 452
Debt securities [Member] | Repurchase agreements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 535 353
Debt securities [Member] | Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 2 2
Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 3,467 3,631
Other [Member] | Derivatives [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 23 35
Other [Member] | Secured borrowings [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 2,575 2,790
Other [Member] | Regulatory requirements [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 78 80
Other [Member] | Non-registered retirement plans in trust [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount 377 424
Other [Member] | Other [Member]    
Disclosure Of Pledged Assets [line items]    
Pledged amount $ 414 $ 302