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Derivative Financial Instruments - Summary of Derivative Financial Instruments at Notional Value (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | $ 12,671,365 | $ 9,058,165
Interest rate contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 10,594,263 | 7,253,076
Interest rate contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 763,135 | 606,019
Interest rate contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 86,992 | 51,420
Interest rate contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 85,635 | 55,025
Interest rate contracts [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 157,348 | 86,872
Interest rate contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 9,501,153 | 6,453,740
Interest rate contracts [member] | Exchange-traded [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 768,366 | 617,297
Interest rate contracts [member] | Exchange-traded [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 763,135 | 606,019
Interest rate contracts [member] | Exchange-traded [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 2,686 | 5,848
Interest rate contracts [member] | Exchange-traded [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 2,545 | 5,430
Interest rate contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 693,886 | 575,985
Interest rate contracts [member] | Over-the-counter [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 84,306 | 45,572
Interest rate contracts [member] | Over-the-counter [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 83,090 | 49,595
Interest rate contracts [member] | Over-the-counter [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 315 | 215
Interest rate contracts [member] | Over-the-counter [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 526,175 | 480,603
Interest rate contracts [member] | Settled through central counterparties [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 9,132,011 | 6,059,794
Interest rate contracts [member] | Settled through central counterparties [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 157,033 | 86,657
Interest rate contracts [member] | Settled through central counterparties [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 8,974,978 | 5,973,137
Foreign exchange and gold contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 1,706,906 | 1,551,034
Foreign exchange and gold contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 18,665 | 21,952
Foreign exchange and gold contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 32,750 | 25,135
Foreign exchange and gold contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 46,781 | 36,390
Foreign exchange and gold contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 971,614 | 879,804
Foreign exchange and gold contracts [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 637,096 | 587,753
Foreign exchange and gold contracts [member] | Exchange-traded [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 18,665 | 21,952
Foreign exchange and gold contracts [member] | Exchange-traded [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 18,665 | 21,952
Foreign exchange and gold contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 1,653,533 | 1,504,217
Foreign exchange and gold contracts [member] | Over-the-counter [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 32,750 | 25,135
Foreign exchange and gold contracts [member] | Over-the-counter [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 46,781 | 36,390
Foreign exchange and gold contracts [member] | Over-the-counter [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 971,614 | 879,804
Foreign exchange and gold contracts [member] | Over-the-counter [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 602,388 | 562,888
Foreign exchange and gold contracts [member] | Settled through central counterparties [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 34,708 | 24,865
Foreign exchange and gold contracts [member] | Settled through central counterparties [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 34,708 | 24,865
Other derivative contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 370,196 | 254,055
Other derivative contracts [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 260,974 | 143,749
Other derivative contracts [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 27,831 | 27,155
Other derivative contracts [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding |  | 81,391 | 83,151
Other derivative contracts [member] | Exchange-traded [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 168,194 | 105,633
Other derivative contracts [member] | Exchange-traded [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 128,297 | 59,329
Other derivative contracts [member] | Exchange-traded [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 39,897 | 46,304
Other derivative contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 194,127 | 139,102
Other derivative contracts [member] | Over-the-counter [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 132,677 | 84,420
Other derivative contracts [member] | Over-the-counter [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 20,457 | 18,086
Other derivative contracts [member] | Over-the-counter [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 40,993 | 36,596
Other derivative contracts [member] | Settled through central counterparties [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 7,875 | 9,320
Other derivative contracts [member] | Settled through central counterparties [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 7,374 | 9,069
Other derivative contracts [member] | Settled through central counterparties [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 501 | 251
Trading derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 12,143,124 | 8,595,691
Trading derivatives [member] | Interest rate contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 10,190,755 | 6,921,281
Trading derivatives [member] | Interest rate contracts [member] | Exchange-traded [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 768,366 | 617,297
Trading derivatives [member] | Interest rate contracts [member] | Exchange-traded [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 763,135 | 606,019
Trading derivatives [member] | Interest rate contracts [member] | Exchange-traded [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 2,686 | 5,848
Trading derivatives [member] | Interest rate contracts [member] | Exchange-traded [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 2,545 | 5,430
Trading derivatives [member] | Interest rate contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 635,095 | 522,504
Trading derivatives [member] | Interest rate contracts [member] | Over-the-counter [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 84,306 | 45,572
Trading derivatives [member] | Interest rate contracts [member] | Over-the-counter [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 83,090 | 49,595
Trading derivatives [member] | Interest rate contracts [member] | Over-the-counter [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 315 | 215
Trading derivatives [member] | Interest rate contracts [member] | Over-the-counter [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 467,384 | 427,122
Trading derivatives [member] | Interest rate contracts [member] | Settled through central counterparties [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 8,787,294 | 5,781,480
Trading derivatives [member] | Interest rate contracts [member] | Settled through central counterparties [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 157,033 | 86,657
Trading derivatives [member] | Interest rate contracts [member] | Settled through central counterparties [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 8,630,261 | 5,694,823
Trading derivatives [member] | Foreign exchange and gold contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 1,583,457 | 1,421,320
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Exchange-traded [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 18,665 | 21,952
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Exchange-traded [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 18,665 | 21,952
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 1,530,084 | 1,374,503
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Over-the-counter [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 32,750 | 25,135
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Over-the-counter [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 46,781 | 36,390
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Over-the-counter [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 869,035 | 771,246
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Over-the-counter [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 581,518 | 541,732
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Settled through central counterparties [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 34,708 | 24,865
Trading derivatives [member] | Foreign exchange and gold contracts [member] | Settled through central counterparties [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 34,708 | 24,865
Trading derivatives [member] | Other derivative contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 368,912 | 253,090
Trading derivatives [member] | Other derivative contracts [member] | Exchange-traded [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 168,194 | 105,633
Trading derivatives [member] | Other derivative contracts [member] | Exchange-traded [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 128,297 | 59,329
Trading derivatives [member] | Other derivative contracts [member] | Exchange-traded [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 39,897 | 46,304
Trading derivatives [member] | Other derivative contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 192,843 | 138,137
Trading derivatives [member] | Other derivative contracts [member] | Over-the-counter [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 131,393 | 83,455
Trading derivatives [member] | Other derivative contracts [member] | Over-the-counter [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 20,457 | 18,086
Trading derivatives [member] | Other derivative contracts [member] | Over-the-counter [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 40,993 | 36,596
Trading derivatives [member] | Other derivative contracts [member] | Settled through central counterparties [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 7,875 | 9,320
Trading derivatives [member] | Other derivative contracts [member] | Settled through central counterparties [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 7,374 | 9,069
Trading derivatives [member] | Other derivative contracts [member] | Settled through central counterparties [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 501 | 251
Hedging derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 528,241 | 462,474
Hedging derivative [member] | Interest rate contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 403,508 | 331,795
Hedging derivative [member] | Interest rate contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 58,791 | 53,481
Hedging derivative [member] | Interest rate contracts [member] | Over-the-counter [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 58,791 | 53,481
Hedging derivative [member] | Interest rate contracts [member] | Settled through central counterparties [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 344,717 | 278,314
Hedging derivative [member] | Interest rate contracts [member] | Settled through central counterparties [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 344,717 | 278,314
Hedging derivative [member] | Foreign exchange and gold contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 123,449 | 129,714
Hedging derivative [member] | Foreign exchange and gold contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 123,449 | 129,714
Hedging derivative [member] | Foreign exchange and gold contracts [member] | Over-the-counter [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 102,579 | 108,558
Hedging derivative [member] | Foreign exchange and gold contracts [member] | Over-the-counter [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 20,870 | 21,156
Hedging derivative [member] | Other derivative contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 1,284 | 965
Hedging derivative [member] | Other derivative contracts [member] | Over-the-counter [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | 1,284 | 965
Hedging derivative [member] | Other derivative contracts [member] | Over-the-counter [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amounts outstanding | [1] | $ 1,284 | $ 965
[1] | The notional amounts represent the amount to which a rate or price is applied to determine the amount of cash flows to be exchanged.

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