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Loans, Impaired Loans and Allowance for Credit Losses - Loans And Acceptances Outstanding By Geography (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of foreign borrowers |  | 98.80% | 96.50%
Total loans and acceptances | [1],[2] | $ 778,685 | $ 767,513
U.S. dollar [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans and acceptances |  | 119,788 | 137,804
Chile, Pesos [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans and acceptances |  | 10,885 | 39,425
Mexico, Pesos [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans and acceptances |  | 12,754 | 31,522
Other Foreign Currencies [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Total loans and acceptances |  | $ 24,665 | $ 54,549
[1] | Geographic segmentation is based on the location of the property for residential mortgages; otherwise, the residence of the borrower.
[2] | Loans and acceptances denominated in U.S. dollars were $119,788 (2024 – $137,804), in Chilean pesos $10,885 (2024 – $39,425), Mexican pesos $12,754 (2024 – $31,522), and in other foreign currencies $24,665 (2024 – $54,549).

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