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Derivative Financial Instruments - Summary of Remaining Term to Maturity of Notional Amounts of Bank's Derivative Financial Instruments (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of financial assets [line items] |  |  |
Notional amount | [1] | $ 12,671,365 | $ 9,058,165
Interest rate contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount | [1] | 10,594,263 | 7,253,076
Interest rate contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 763,135 | 606,019
Interest rate contracts [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 157,348 | 86,872
Interest rate contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 9,501,153 | 6,453,740
Interest rate contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 86,992 | 51,420
Interest rate contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 85,635 | 55,025
Foreign exchange and gold contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount | [1] | 1,706,906 | 1,551,034
Foreign exchange and gold contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 18,665 | 21,952
Foreign exchange and gold contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 971,614 | 879,804
Foreign exchange and gold contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 32,750 | 25,135
Foreign exchange and gold contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 46,781 | 36,390
Foreign exchange and gold contracts [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 637,096 | 587,753
Other derivative contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount | [1] | 370,196 | 254,055
Other derivative contracts [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 260,974 | 143,749
Other derivative contracts [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 27,831 | 27,155
Other derivative contracts [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 81,391 | 83,151
Within one year [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 6,652,699 | 3,799,022
Within one year [member] | Interest rate contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 5,462,942 | 2,809,073
Within one year [member] | Interest rate contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 617,714 | 478,886
Within one year [member] | Interest rate contracts [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 122,168 | 85,447
Within one year [member] | Interest rate contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 4,604,519 | 2,190,218
Within one year [member] | Interest rate contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 66,995 | 30,562
Within one year [member] | Interest rate contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 51,546 | 23,960
Within one year [member] | Foreign exchange and gold contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 915,679 | 816,747
Within one year [member] | Foreign exchange and gold contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 16,134 | 16,289
Within one year [member] | Foreign exchange and gold contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 243,425 | 210,318
Within one year [member] | Foreign exchange and gold contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 25,053 | 18,121
Within one year [member] | Foreign exchange and gold contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 37,985 | 28,533
Within one year [member] | Foreign exchange and gold contracts [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 593,082 | 543,486
Within one year [member] | Other derivative contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 274,078 | 173,202
Within one year [member] | Other derivative contracts [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 195,981 | 103,234
Within one year [member] | Other derivative contracts [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 16,976 | 12,661
Within one year [member] | Other derivative contracts [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 61,121 | 57,307
One to five years [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 3,945,187 | 3,514,791
One to five years [member] | Interest rate contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 3,308,577 | 2,926,404
One to five years [member] | Interest rate contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 145,421 | 127,133
One to five years [member] | Interest rate contracts [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 34,865 | 1,217
One to five years [member] | Interest rate contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 3,089,234 | 2,760,062
One to five years [member] | Interest rate contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 17,710 | 18,095
One to five years [member] | Interest rate contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 21,347 | 19,897
One to five years [member] | Foreign exchange and gold contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 544,984 | 513,846
One to five years [member] | Foreign exchange and gold contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 2,482 | 5,663
One to five years [member] | Foreign exchange and gold contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 489,190 | 455,694
One to five years [member] | Foreign exchange and gold contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 7,183 | 6,788
One to five years [member] | Foreign exchange and gold contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 8,230 | 7,662
One to five years [member] | Foreign exchange and gold contracts [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 37,899 | 38,039
One to five years [member] | Other derivative contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 91,626 | 74,541
One to five years [member] | Other derivative contracts [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 63,216 | 39,521
One to five years [member] | Other derivative contracts [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 8,308 | 9,553
One to five years [member] | Other derivative contracts [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 20,102 | 25,467
Over five years [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 2,073,479 | 1,744,352
Over five years [member] | Interest rate contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 1,822,744 | 1,517,599
Over five years [member] | Interest rate contracts [member] | Forward contract [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 315 | 208
Over five years [member] | Interest rate contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 1,807,400 | 1,503,460
Over five years [member] | Interest rate contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 2,287 | 2,763
Over five years [member] | Interest rate contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 12,742 | 11,168
Over five years [member] | Foreign exchange and gold contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 246,243 | 220,441
Over five years [member] | Foreign exchange and gold contracts [member] | Futures [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 49 |
Over five years [member] | Foreign exchange and gold contracts [member] | Swaps [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 238,999 | 213,792
Over five years [member] | Foreign exchange and gold contracts [member] | Options purchased [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 514 | 226
Over five years [member] | Foreign exchange and gold contracts [member] | Options written [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 566 | 195
Over five years [member] | Foreign exchange and gold contracts [member] | Spot and forwards [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 6,115 | 6,228
Over five years [member] | Other derivative contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 4,492 | 6,312
Over five years [member] | Other derivative contracts [member] | Equity derivatives [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 1,777 | 994
Over five years [member] | Other derivative contracts [member] | Credit derivative [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | 2,547 | 4,941
Over five years [member] | Other derivative contracts [member] | Commodity and other contracts [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Notional amount |  | $ 168 | $ 377
[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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