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Loans - Summary of Carrying Amount of Loans Based on Internal Risk Rating Grades (Parenthetical) (Detail) - CAD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2025 | Oct. 31, 2024
Disclosure of internal credit grades [line items] |  |  |
ECL allowance |  | $ 23 | $ 19
Residential mortgages |  | 285,935 | 280,672
Business and government loans | [1] | 231,414 | 214,305
Customers' liability under acceptances |  | 8 | 6
Expected credit loss allowance on debt securities classified at amortized cost |  | 40 | 17
Stage 3 [member] | Financial instruments credit-impaired [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Residential mortgages |  | 1,245 | 994
Stage 3 [member] | Financial instruments credit-impaired [member] | Other assets [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Foreclosed assets |  | 6 | 8
Financial assets at fair value through net income [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Residential mortgages |  | 5 | 3
Business and government loans |  | $ 459 | $ 221
[1] | Includes customers’ liability under acceptances of $8 million (October 31, 2024: $6 million) in business and government loans and acceptances of $8 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.

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