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Derivative Instruments - Cash Flow Hedges and Net Investment Hedges Reconciliation Related To Impacts on Consolidated Statement of Other Comprehensive Income, On a Pre-Tax Basis (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Beginning Balance |  | $ 5,419 |  |
Ending Balance |  | 7,986 |  | $ 5,419
Cash Flow Hedges [member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Beginning Balance |  | (2,046) | [1],[2] | (7,477)
Gains / (losses) recognized in OCI |  | 1,360 |  | 3,478
Amount reclassified to net income as the hedged item affects net income |  | 1,448 |  | 1,953
Ending Balance | [1],[2] | 762 |  | (2,046)
Active hedges |  | 2,779 |  | 2,129
Discontinued hedges |  | (2,017) |  | (4,175)
Cash Flow Hedges [member] | Interest rate risk [member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Beginning Balance |  | (2,480) | [1],[2] | (8,015)
Gains / (losses) recognized in OCI |  | 1,316 |  | 3,564
Amount reclassified to net income as the hedged item affects net income |  | 1,600 |  | 1,971
Ending Balance | [1],[2] | 436 |  | (2,480)
Active hedges |  | 2,453 |  | 1,695
Discontinued hedges |  | (2,017) |  | (4,175)
Cash Flow Hedges [member] | Foreign exchange risk [member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Beginning Balance |  | 357 | [1],[2] | 610
Gains / (losses) recognized in OCI |  | (214) |  | (251)
Amount reclassified to net income as the hedged item affects net income |  | (1) |  | (2)
Ending Balance | [1],[2] | 142 |  | 357
Active hedges |  | 142 |  | 357
Cash Flow Hedges [member] | Equity price risk [member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Beginning Balance |  | 77 | [1],[2] | (72)
Gains / (losses) recognized in OCI |  | 258 |  | 165
Amount reclassified to net income as the hedged item affects net income |  | (151) |  | (16)
Ending Balance | [1],[2] | 184 |  | 77
Active hedges |  | 184 |  | 77
Net Investment Hedges [member] | Foreign exchange risk [member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Beginning Balance |  | (2,324) | [1],[2] | (2,186)
Gains / (losses) recognized in OCI |  | (105) |  | (138)
Ending Balance | [1],[2] | (2,429) |  | (2,324)
Active hedges |  | (2,429) |  | (2,324)
Hedged item [Member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Beginning Balance |  | (4,370) | [1],[2] | (9,663)
Gains / (losses) recognized in OCI |  | 1,255 |  | 3,340
Amount reclassified to net income as the hedged item affects net income |  | 1,448 |  | 1,953
Ending Balance | [1],[2] | (1,667) |  | (4,370)
Active hedges |  | 350 |  | (195)
Discontinued hedges |  | $ (2,017) |  | $ (4,175)
[1] | Tax balance related to cash flow hedges accumulated other comprehensive income was $(235) million as at October 31, 2025 ($527 million as at October 31, 2024).
[2] | Tax balance related to net investment hedges accumulated other comprehensive income was $622 million as at October 31, 2025 ($593 million as at October 31, 2024).

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- Definition The amount of accumulated items of income and expense (including reclassification adjustments) that are not recognised in profit or loss as required or permitted by other IFRSs. [Refer: IFRSs [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + 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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