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IFRS 7 - Disclosure - Market Risk - Summary of Structural Interest Rate Sensitivity - Measures (Detail) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2025 | Apr. 30, 2025 | Apr. 30, 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 | $ 150 | $ 121 | $ 305
Increase (decrease) in EVE | (1,515) | (1,512) | (1,187)
100 basis point decrease in interest rates [member] |  |  |
Disclosure foreign currency sensitivity analysis effect on equity [line items] |  |  |
Increase (decrease) in net interest income | (218) | (189) | (361)
Increase (decrease) in EVE | 1,439 | 1,366 | 1,104
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 | 109 | 84 | 216
Increase (decrease) in EVE | (1,061) | (1,055) | (820)
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 | (174) | (148) | (273)
Increase (decrease) in EVE | 975 | 903 | 724
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 | 41 | 37 | 89
Increase (decrease) in EVE | (454) | (457) | (367)
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 | (44) | (41) | (88)
Increase (decrease) in EVE | $ 464 | $ 463 | $ 380

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