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Derivative Financial Instruments - Summary of Financial Derivatives at Fair Value (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  |  | $ 29,999 |
Average fair value of trading derivatives, Unfavourable |  |  | 32,133 |
Year-end fair value, Favourable |  | $ 46,531 | 44,379 |
Year-end fair value, Unfavourable |  | 56,031 | 51,260 |
Derivatives [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Year-end fair value, Favourable |  | 46,531 | 44,379 | [1]
Year-end fair value, Unfavourable |  | 56,031 | 51,260 | [1]
Derivatives [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 34,881 |  |
Average fair value of trading derivatives, Unfavourable |  | 43,462 |  |
Year-end fair value, Favourable |  | 35,791 | 33,667 | [1]
Year-end fair value, Unfavourable |  | 44,517 | 37,576 | [1]
Derivatives [member] | Hedging [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Year-end fair value, Favourable |  | 10,740 | 10,712 | [1]
Year-end fair value, Unfavourable |  | 11,514 | 13,684 | [1]
Interest rate contracts [member] | Derivatives [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 7,942 |  |
Average fair value of trading derivatives, Unfavourable |  | 12,009 |  |
Year-end fair value, Favourable |  | 7,187 | 8,640 | [1]
Year-end fair value, Unfavourable |  | 10,828 | 9,925 | [1]
Interest rate contracts [member] | Derivatives [member] | Forward contract [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 90 |  |
Average fair value of trading derivatives, Unfavourable |  | 69 |  |
Year-end fair value, Favourable |  | 61 | 70 | [1]
Year-end fair value, Unfavourable |  | 91 | 72 | [1]
Interest rate contracts [member] | Derivatives [member] | Swaps [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 7,398 |  |
Average fair value of trading derivatives, Unfavourable |  | 11,440 |  |
Year-end fair value, Favourable |  | 6,865 | 7,767 | [1]
Year-end fair value, Unfavourable |  | 10,294 | 9,357 | [1]
Interest rate contracts [member] | Derivatives [member] | Swaps [member] | Hedging [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Year-end fair value, Favourable |  | 2,620 | 2,944 | [1]
Year-end fair value, Unfavourable |  | 6,361 | 7,983 | [1]
Interest rate contracts [member] | Derivatives [member] | Option contract [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 454 |  |
Average fair value of trading derivatives, Unfavourable |  | 500 |  |
Year-end fair value, Favourable |  | 261 | 803 | [1]
Year-end fair value, Unfavourable |  | 443 | 496 | [1]
Foreign exchange and gold contracts [member] | Derivatives [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 18,611 |  |
Average fair value of trading derivatives, Unfavourable |  | 20,337 |  |
Year-end fair value, Favourable |  | 18,371 | 18,274 | [1]
Year-end fair value, Unfavourable |  | 20,640 | 20,200 | [1]
Foreign exchange and gold contracts [member] | Derivatives [member] | Hedging [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Year-end fair value, Favourable |  | 8,041 | 7,730 | [1]
Year-end fair value, Unfavourable |  | 5,153 | 5,700 | [1]
Foreign exchange and gold contracts [member] | Derivatives [member] | Forward contract [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 6,568 |  |
Average fair value of trading derivatives, Unfavourable |  | 5,929 |  |
Year-end fair value, Favourable |  | 6,726 | 6,672 | [1]
Year-end fair value, Unfavourable |  | 5,332 | 5,482 | [1]
Foreign exchange and gold contracts [member] | Derivatives [member] | Forward contract [member] | Hedging [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Year-end fair value, Favourable |  | 46 | 410 | [1]
Year-end fair value, Unfavourable |  | 847 | 255 | [1]
Foreign exchange and gold contracts [member] | Derivatives [member] | Swaps [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 11,439 |  |
Average fair value of trading derivatives, Unfavourable |  | 13,833 |  |
Year-end fair value, Favourable |  | 11,107 | 11,110 | [1]
Year-end fair value, Unfavourable |  | 14,814 | 14,272 | [1]
Foreign exchange and gold contracts [member] | Derivatives [member] | Swaps [member] | Hedging [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Year-end fair value, Favourable |  | 7,995 | 7,320 | [1]
Year-end fair value, Unfavourable |  | 4,306 | 5,445 | [1]
Foreign exchange and gold contracts [member] | Derivatives [member] | Option contract [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 604 |  |
Average fair value of trading derivatives, Unfavourable |  | 575 |  |
Year-end fair value, Favourable |  | 538 | 492 | [1]
Year-end fair value, Unfavourable |  | 494 | 446 | [1]
Other derivative contracts [member] | Derivatives [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 8,328 |  |
Average fair value of trading derivatives, Unfavourable |  | 11,116 |  |
Year-end fair value, Favourable |  | 10,233 | 6,753 | [1]
Year-end fair value, Unfavourable |  | 13,049 | 7,451 | [1]
Other derivative contracts [member] | Derivatives [member] | Equity derivatives [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 5,582 |  |
Average fair value of trading derivatives, Unfavourable |  | 7,543 |  |
Year-end fair value, Favourable |  | 7,350 | 4,469 | [1]
Year-end fair value, Unfavourable |  | 10,114 | 4,844 | [1]
Other derivative contracts [member] | Derivatives [member] | Equity derivatives [member] | Hedging [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Year-end fair value, Favourable |  | 79 | 38 | [1]
Year-end fair value, Unfavourable | [1] |  | 1 |
Other derivative contracts [member] | Derivatives [member] | Credit derivative [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 230 |  |
Average fair value of trading derivatives, Unfavourable |  | 28 |  |
Year-end fair value, Favourable |  | 273 | 182 | [1]
Year-end fair value, Unfavourable |  | 26 | 47 | [1]
Other derivative contracts [member] | Derivatives [member] | Commodity and other contracts [member] | Trading [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Average fair value of trading derivatives, Favourable |  | 2,516 |  |
Average fair value of trading derivatives, Unfavourable |  | 3,545 |  |
Year-end fair value, Favourable |  | 2,610 | 2,102 | [1]
Year-end fair value, Unfavourable |  | $ 2,909 | $ 2,560 | [1]
[1] | The average fair value of trading derivatives’ market valuation for the year ended October 31, 2024 was: favourable $29,999 and unfavourable $32,133. Average fair value amounts are based on the latest 13 month-end balances.

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