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IFRS 7 Disclosure - Summary of Structural Interest Sensitivity (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
100 bp increase [member] |  |
Disclosure Foreign Currency Sensitivity Analysis Effect On Equity [Line Items] |  |
Economic value of equity | $ (1,568) | $ (1,338)
Net interest income | 236 | (21)
100 bp decrease [member] |  |
Disclosure Foreign Currency Sensitivity Analysis Effect On Equity [Line Items] |  |
Economic value of equity | 1,201 | 780
Net interest income | (245) | $ (31)
Canada Dollars [Member] | 100 bp increase [member] |  |
Disclosure Foreign Currency Sensitivity Analysis Effect On Equity [Line Items] |  |
Economic value of equity | (616) |
Net interest income | 247 |
Canada Dollars [Member] | 100 bp decrease [member] |  |
Disclosure Foreign Currency Sensitivity Analysis Effect On Equity [Line Items] |  |
Economic value of equity | 530 |
Net interest income | (224) |
United States of America Dollars [Member] | 100 bp increase [member] |  |
Disclosure Foreign Currency Sensitivity Analysis Effect On Equity [Line Items] |  |
Economic value of equity | (952) |
Net interest income | (11) |
United States of America Dollars [Member] | 100 bp decrease [member] |  |
Disclosure Foreign Currency Sensitivity Analysis Effect On Equity [Line Items] |  |
Economic value of equity | 671 |
Net interest income | $ (21) |

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