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Derivative Instruments - Cash Flow Hedges and Net Investment Hedges Information Related To Items Designated As Hedging Instruments, Hedged Items and Hedge Ineffectiveness (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Cash Flow Hedges [member] |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Carrying amount of hedging instruments, Asset |  | $ 4,536 | $ 2,910
Carrying amount of hedging instruments, Liability | [1] | (2,017) | (1,995)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness | [2] | 1,363 | 3,466
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness | [2] | (1,426) | (3,529)
Ineffectiveness recorded in non-interest revenue - other |  | 3 | (12)
Net Investment Hedges [member] |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Carrying amount of hedging instruments, Asset |  | 4,536 | 2,910
Carrying amount of hedging instruments, Liability | [1] | (24,783) | (18,352)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness | [2] | 1,256 | 3,324
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness | [2] | (1,321) | (3,391)
Ineffectiveness recorded in non-interest revenue - other |  | 1 | (16)
Interest rate risk [member] | Cash Flow Hedges [member] | Interest rate swap contract [member] |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Carrying amount of hedging instruments, Asset |  | 2,931 | 2,148
Carrying amount of hedging instruments, Liability | [1] | (464) | (915)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness | [2] | 1,319 | 3,552
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness | [2] | (1,382) | (3,615)
Ineffectiveness recorded in non-interest revenue - other |  | 3 | (12)
Foreign exchange risk [member] | Cash Flow Hedges [member] | Cross currency swap [member] |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Carrying amount of hedging instruments, Asset |  | 1,576 | 699
Carrying amount of hedging instruments, Liability | [1] | (1,553) | (1,080)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness | [2] | (214) | (251)
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness | [2] | 214 | 251
Foreign exchange risk [member] | Net Investment Hedges [member] |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Carrying amount of hedging instruments, Liability | [1] | (22,750) | (16,353)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness | [2] | (102) | (119)
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness | [2] | 102 | 119
Ineffectiveness recorded in non-interest revenue - other |  | (2) |
Foreign exchange risk [member] | Net Investment Hedges [member] | Cross currency swap [member] |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Carrying amount of hedging instruments, Liability | [1] | (16) | (4)
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness | [2] | (5) | (23)
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness | [2] | 3 | 19
Ineffectiveness recorded in non-interest revenue - other |  |  | (4)
Equity price risk [member] | Cash Flow Hedges [member] | Total Return Swaps [Member] |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Carrying amount of hedging instruments, Asset |  | 29 | 63
Gains (losses) on hedging derivatives used to calculate hedge ineffectiveness | [2] | 258 | 165
Hedge ineffectiveness Gains (losses) on hypothetical derivatives used to calculate hedge ineffectiveness | [2] | $ (258) | $ (165)
[1] | Represents unrealized gains (losses) recorded as part of derivative instruments in assets and liabilities, respectively, in our Consolidated Balance Sheet.
[2] | Represents life to date amounts.

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gain (loss) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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