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Loans - Summary of Carrying Amount of Loans Based on Internal Risk Rating Grades (Parenthetical) (Detail) - CAD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Apr. 30, 2025
Oct. 31, 2024
Disclosure of internal credit grades [line items]    
ECL allowance $ 18 $ 19
Residential mortgages 283,437 280,672
Business and government loans [1] 224,753 214,305
Customers' liability under acceptances 10 6
Expected credit loss allowance on debt securities classified at amortized cost 15 17
Stage 3 [member] | Financial instruments credit-impaired [member]    
Disclosure of internal credit grades [line items]    
Residential mortgages 1,159 994
Stage 3 [member] | Financial instruments credit-impaired [member] | Other assets [member]    
Disclosure of internal credit grades [line items]    
Foreclosed assets 5 8
Financial assets at fair value through net income [member]    
Disclosure of internal credit grades [line items]    
Residential mortgages 3 3
Business and government loans $ 614 $ 221
[1] Includes customers’ liability under acceptances of $10 million (October 31, 2024: $6 million) in business and government loans and acceptances of $10 million (October 31, 2024: $6 million) in other liabilities. Prior period amounts have been revised to conform to the presentation adopted in the first quarter of 2025.