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Derivative Instruments - Schedule of Notional Amount and Average Rates of Derivatives and the Carrying Amount of Deposits Designated as Hedging Instruments, by Term to Maturity (Detail) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 CAD ($) | Oct. 31, 2024 CAD ($)
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 21,343,075 | $ 25,192,367
Carrying amount | 57,151 | 47,253
Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | 8,788,276 |
1 to 3 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | 5,969,331 |
3 to 5 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | 2,900,452 |
5 to 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | 2,532,373 |
Over 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | 1,152,643 |
Cash flow hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 261,099 | $ 266,872
Average interest rate | 3.33 | 3.75
Cash flow hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 85,536 |
Average interest rate | 3.49 |
Cash flow hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | 1 to 3 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 84,666 |
Average interest rate | 3.06 |
Cash flow hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | 3 to 5 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 54,048 |
Average interest rate | 3.53 |
Cash flow hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | 5 to 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 31,409 |
Average interest rate | 3.22 |
Cash flow hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | Over 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 5,440 |
Average interest rate | 3.87 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-USD pair [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 39,233 | $ 40,933
Average interest rate | 3.34 | 3.14
Average exchange rate | 1.3366 | 1.3252
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-USD pair [member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 10,865 |
Average interest rate | 3.46 |
Average exchange rate | 1.3341 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-USD pair [member] | 1 to 3 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 16,681 |
Average interest rate | 3.49 |
Average exchange rate | 1.3258 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-USD pair [member] | 3 to 5 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 11,303 |
Average interest rate | 2.99 |
Average exchange rate | 1.356 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-USD pair [member] | 5 to 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 334 |
Average interest rate | 3.68 |
Average exchange rate | 1.3157 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-USD pair [member] | Over 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 50 |
Average interest rate | 2.83 |
Average exchange rate | 1.2327 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-EUR pair [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 19,915 | $ 17,399
Average interest rate | 3.39 | 3.47
Average exchange rate | 1.4596 | 1.4293
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-EUR pair [member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 6,732 |
Average interest rate | 3.74 |
Average exchange rate | 1.419 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-EUR pair [member] | 1 to 3 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 8,066 |
Average interest rate | 3.08 |
Average exchange rate | 1.4588 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-EUR pair [member] | 3 to 5 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 3,310 |
Average interest rate | 3.21 |
Average exchange rate | 1.4711 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-EUR pair [member] | 5 to 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 1,807 |
Average interest rate | 3.77 |
Average exchange rate | 1.5935 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | Other currency pairs [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 10,243 | $ 9,927
Average interest rate | 3.4 | 3.26
Average exchange rate | 1.5812 | 1.5391
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | Other currency pairs [member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 5,219 |
Average interest rate | 2.63 |
Average exchange rate | 1.708 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | Other currency pairs [member] | 1 to 3 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 2,511 |
Average interest rate | 4.23 |
Average exchange rate | 1.5621 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | Other currency pairs [member] | 3 to 5 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 2,379 |
Average interest rate | 4.12 |
Average exchange rate | 1.3796 |
Cash flow hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | Other currency pairs [member] | 5 to 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 134 |
Average interest rate | 5.13 |
Average exchange rate | 0.5717 |
Cash flow hedges [member] | Equity price risk [member] | Total Return Swaps [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 552 | $ 480
Cash flow hedges [member] | Equity price risk [member] | Total Return Swaps [Member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 552 |
Fair Value Hedges [member] | Bond futures (exchange-traded derivatives) [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Average interest rate | 154 | 108
Fair Value Hedges [member] | Bond futures (exchange-traded derivatives) [member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Average interest rate | 154 |
Fair Value Hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 220,509 | $ 188,278
Average interest rate | 3.56 | 3.99
Fair Value Hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 65,785 |
Average interest rate | 3.52 |
Fair Value Hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | 1 to 3 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 59,859 |
Average interest rate | 3.62 |
Fair Value Hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | 3 to 5 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 58,913 |
Average interest rate | 3.49 |
Fair Value Hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | 5 to 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 31,494 |
Average interest rate | 3.6 |
Fair Value Hedges [member] | Interest rate risk [member] | Interest rate swaps [Member] | Over 10 years [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 4,458 |
Average interest rate | 3.82 |
Fair Value Hedges [member] | Interest rate risk [member] | Bond futures (exchange-traded derivatives) [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 432 | $ 1,479
Fair Value Hedges [member] | Interest rate risk [member] | Bond futures (exchange-traded derivatives) [member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | 432 |
Fair Value Hedges [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | USD-EUR pair [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount |  | $ 21
Average interest rate |  | 3.25
Average exchange rate |  | 0.9706
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | USD denominated deposit [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Carrying amount | 22,395 | $ 16,053
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | USD denominated deposit [member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Carrying amount | 22,395 |
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | GBP denominated deposit [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Carrying amount | 355 | 300
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | GBP denominated deposit [member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Carrying amount | 355 |
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-CNH pair [Member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | 669 | $ 677
Hedges of net investment in foreign operations [member] | Foreign exchange risk [member] | Cross currency swaps and foreign exchange forwards [member] | CAD-CNH pair [Member] | Within 1 year [member] |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Notional amount | $ 669 |

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