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Designated Accounting Hedges - Summary of Hedge Accounting Impact on the Consolidated Statement of Comprehensive Income (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of information about hedge accounting impact on statement of comprehensive income [line items] |  |
Amount reclassified from accumulated OCI to income (before-tax) | $ 0 | $ 0
Tax benefit (expense) | (189) | (590)
Cash flow hedges [member] |  |
Disclosure of information about hedge accounting impact on statement of comprehensive income [line items] |  |
Beginning balance of AOCI -hedge reserve (after-tax) | 509 | (1,026)
Change in the value of the hedging instrument recognized in OCI (before-tax) | 1,965 | 3,252
Amount reclassified from accumulated OCI to income (before-tax) | (1,285) | (1,127)
Tax benefit (expense) | (189) | (590)
Ending balance of AOCI - hedge reserve (after-tax) | 1,000 | 509
Hedge ineffectiveness gains (losses) recognized in income | 2 | 6
Cash flow hedges [member] | Foreign Exchange Risks [member] |  |
Disclosure of information about hedge accounting impact on statement of comprehensive income [line items] |  |
Beginning balance of AOCI -hedge reserve (after-tax) | (20) | (27)
Change in the value of the hedging instrument recognized in OCI (before-tax) | 687 | 710
Amount reclassified from accumulated OCI to income (before-tax) | (672) | (701)
Tax benefit (expense) | (4) | (2)
Ending balance of AOCI - hedge reserve (after-tax) | (9) | (20)
Hedge ineffectiveness gains (losses) recognized in income | (1) | 3
Cash flow hedges [member] | Interest rate risk [member] |  |
Disclosure of information about hedge accounting impact on statement of comprehensive income [line items] |  |
Beginning balance of AOCI -hedge reserve (after-tax) | 396 | (970)
Change in the value of the hedging instrument recognized in OCI (before-tax) | 565 | 1,622
Amount reclassified from accumulated OCI to income (before-tax) | 79 | 270
Tax benefit (expense) | (179) | (526)
Ending balance of AOCI - hedge reserve (after-tax) | 861 | 396
Hedge ineffectiveness gains (losses) recognized in income | 3 | 3
Cash flow hedges [member] | Equity share price risk [member] |  |
Disclosure of information about hedge accounting impact on statement of comprehensive income [line items] |  |
Beginning balance of AOCI -hedge reserve (after-tax) | 133 | (29)
Change in the value of the hedging instrument recognized in OCI (before-tax) | 713 | 920
Amount reclassified from accumulated OCI to income (before-tax) | (692) | (696)
Tax benefit (expense) | (6) | (62)
Ending balance of AOCI - hedge reserve (after-tax) | 148 | 133
NIFO hedges [member] | Foreign Exchange Risks [member] |  |
Disclosure of information about hedge accounting impact on statement of comprehensive income [line items] |  |
Beginning balance of AOCI -hedge reserve (after-tax) | (3,215) | (2,948)
Change in the value of the hedging instrument recognized in OCI (before-tax) | (297) | (267)
Tax benefit (expense) | (68) |
Ending balance of AOCI - hedge reserve (after-tax) | $ (3,580) | $ (3,215)

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- Definition Gain loss on hedge ineffectiveness recognised in other comprehensive income before tax. + References No definition available. + Details
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- Definition The gain (loss) recognised in profit or loss 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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