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IFRS 7 - Disclosure - Market Risk - Summary of Structural Interest Rate Sensitivity - Measures (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2025 | Jul. 31, 2025 | Jul. 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 | $ 121 | $ 147 | $ 224
Increase (decrease) in EVE | (1,512) | (1,513) | (1,325)
100 basis point decrease in interest rates [member] |  |  |
Disclosure foreign currency sensitivity analysis effect on equity [line items] |  |  |
Increase (decrease) in net interest income | (189) | (225) | (271)
Increase (decrease) in EVE | 1,366 | 1,359 | 1,248
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 | 84 | 116 | 145
Increase (decrease) in EVE | (1,055) | (1,072) | (919)
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 | (148) | (191) | (191)
Increase (decrease) in EVE | 903 | 922 | 831
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 | 37 | 31 | 79
Increase (decrease) in EVE | (457) | (441) | (406)
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 | (41) | (34) | (80)
Increase (decrease) in EVE | $ 463 | $ 437 | $ 417

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