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Loans - Additional Information (Detail) - CAD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Downside Scenario [Member]    
Disclosure of detailed information about borrowings [line items]    
ECL expected value $ 615 $ 938
Probability weighting percentage 100.00%  
Base Scenario [Member]    
Disclosure of detailed information about borrowings [line items]    
ECL expected value $ (262) $ (204)
Probability weighting percentage 100.00%