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Derivative Financial Instruments - Summary of Notional Amount of Derivatives and Carrying Amount of Cash and Deposit Liabilities Designated as Hedging Instruments (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [1] | $ 12,671,365 | $ 9,058,165
Deposit liabilities - carrying amount [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 585,965 | 532,645
Deposit liabilities - carrying amount [member] | Fair value hedges [member] | Interest rate risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 240,588 | 195,239
Deposit liabilities - carrying amount [member] | Fair value hedges [member] | Currency or interest rate risk [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 420 |
Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Interest rate risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 139,504 | 115,373
Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency or interest rate risk [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 28,919 | 29,166
Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 148,001 | 163,101
Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency risk [member] | Foreign currency forward contracts [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 266 |
Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency risk [member] | Cash [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 92 | 74
Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Equity price risk [member] | Total return swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 1,284 | 965
Deposit liabilities - carrying amount [member] | Hedges of net investment in foreign operations [member] | Currency risk [member] | Foreign currency deposit liabilities [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 6,287 | 7,571
Deposit liabilities - carrying amount [member] | Hedges of net investment in foreign operations [member] | Currency risk [member] | Foreign currency forward contracts [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 20,604 | 21,156
Within one year [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount |  | 6,652,699 | 3,799,022
Within one year [member] | Deposit liabilities - carrying amount [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 189,534 | 146,893
Within one year [member] | Deposit liabilities - carrying amount [member] | Fair value hedges [member] | Interest rate risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 53,192 | 32,689
Within one year [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Interest rate risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 57,151 | 29,411
Within one year [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency or interest rate risk [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 6,542 | 5,516
Within one year [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 44,824 | 50,198
Within one year [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency risk [member] | Foreign currency forward contracts [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 266 |
Within one year [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency risk [member] | Cash [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 92 | 74
Within one year [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Equity price risk [member] | Total return swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 576 | 278
Within one year [member] | Deposit liabilities - carrying amount [member] | Hedges of net investment in foreign operations [member] | Currency risk [member] | Foreign currency deposit liabilities [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 6,287 | 7,571
Within one year [member] | Deposit liabilities - carrying amount [member] | Hedges of net investment in foreign operations [member] | Currency risk [member] | Foreign currency forward contracts [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 20,604 | 21,156
One to five years [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount |  | 3,945,187 | 3,514,791
One to five years [member] | Deposit liabilities - carrying amount [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 334,523 | 322,998
One to five years [member] | Deposit liabilities - carrying amount [member] | Fair value hedges [member] | Interest rate risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 155,430 | 137,123
One to five years [member] | Deposit liabilities - carrying amount [member] | Fair value hedges [member] | Currency or interest rate risk [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 420 |
One to five years [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Interest rate risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 73,038 | 72,802
One to five years [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency or interest rate risk [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 16,892 | 19,291
One to five years [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 88,035 | 93,095
One to five years [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Equity price risk [member] | Total return swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 708 | 687
Over five years [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount |  | 2,073,479 | 1,744,352
Over five years [member] | Deposit liabilities - carrying amount [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 61,908 | 62,754
Over five years [member] | Deposit liabilities - carrying amount [member] | Fair value hedges [member] | Interest rate risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 31,966 | 25,427
Over five years [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Interest rate risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 9,315 | 13,160
Over five years [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency or interest rate risk [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | 5,485 | 4,359
Over five years [member] | Deposit liabilities - carrying amount [member] | Cash flow hedges [member] | Currency risk [member] | Swaps [member] |  |  |
Disclosure of detailed information about hedging instruments [line items] |  |  |
Derivative notional amount | [2] | $ 15,142 | $ 19,808
[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.
[2] | Notional amounts relating to derivatives that are hedging multiple risks in both assets and liabilities are included in more than one category.

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