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IFRS 7 - Disclosure - Market Risk - Summary of Structural Interest Rate Sensitivity - Measures (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
100 basis point increase in interest rates [member] |  |
Disclosure foreign currency sensitivity analysis effect on equity [line items] |  |
Increase (decrease) in net interest income | $ 163 | $ 204
Increase (decrease) in EVE | (1,678) | (1,356)
100 basis point decrease in interest rates [member] |  |
Disclosure foreign currency sensitivity analysis effect on equity [line items] |  |
Increase (decrease) in net interest income | (249) | (242)
Increase (decrease) in EVE | 1,525 | 1,237
Canadian currency [member] | 100 basis point increase in interest rates [member] |  |
Disclosure foreign currency sensitivity analysis effect on equity [line items] |  |
Increase (decrease) in net interest income | 137 | 159
Increase (decrease) in EVE | (1,168) | (956)
Canadian currency [member] | 100 basis point decrease in interest rates [member] |  |
Disclosure foreign currency sensitivity analysis effect on equity [line items] |  |
Increase (decrease) in net interest income | (220) | (193)
Increase (decrease) in EVE | 1,025 | 829
Denominated in U.S. dollars [member] | 100 basis point increase in interest rates [member] |  |
Disclosure foreign currency sensitivity analysis effect on equity [line items] |  |
Increase (decrease) in net interest income | 26 | 45
Increase (decrease) in EVE | (510) | (400)
Denominated in U.S. dollars [member] | 100 basis point decrease in interest rates [member] |  |
Disclosure foreign currency sensitivity analysis effect on equity [line items] |  |
Increase (decrease) in net interest income | (29) | (49)
Increase (decrease) in EVE | $ 500 | $ 408

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