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Loans - Additional Information (Detail) - CAD ($)
$ in Millions
Jan. 31, 2022
Oct. 31, 2021
Downside Scenario [Member]    
Disclosure of detailed information about borrowings [line items]    
ECL expected value $ 339 $ 414
Probability weighting percentage 100.00%  
Base Scenario [Member]    
Disclosure of detailed information about borrowings [line items]    
ECL expected value $ 240 $ 249
Probability weighting percentage 100.00%