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Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |
Insurance contract liabilities, beginning of year | $ 17,248 | $ 13,349
Insurance service results | (358) | (347)
Net finance expenses from insurance contracts | 1,048 | 2,206
Total cash flows | 1,724 | 2,040
Other changes in the net carrying amount of the insurance contract | (796) |
Insurance contract liabilities, end of year | 18,866 | 17,248
Liabilities for remaining coverage [member] |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |
Insurance contract liabilities, beginning of year | 17,047 | 13,114
Insurance service results | (2,406) | (1,448)
Net finance expenses from insurance contracts | 1,048 | 2,206
Total cash flows | 3,763 | 3,176
Other changes in the net carrying amount of the insurance contract | (785) | (1)
Insurance contract liabilities, end of year | 18,667 | 17,047
Liabilities for incurred claims [member] |  |
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] |  |
Insurance contract liabilities, beginning of year | 201 | 235
Insurance service results | 2,048 | 1,101
Total cash flows | (2,039) | (1,136)
Other changes in the net carrying amount of the insurance contract | (11) | 1
Insurance contract liabilities, end of year | $ 199 | $ 201

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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from additional items that may be necessary to understand the change in the net carrying amount of the insurance contracts. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 105 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_105_d&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from cash flows. [Refer: Insurance contracts liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 105 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_105_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance finance income or expenses. [Refer: Insurance contracts liability (asset); Insurance finance income (expenses)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 105 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_105_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The increase (decrease) in insurance contracts liability (asset) resulting from insurance service result. [Refer: Insurance contracts liability (asset); Insurance service result] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 103 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_103&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 17 -IssueDate 2024-01-01 -Paragraph 104 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2024-en-r&anchor=para_104&doctype=Standard -URIDate 2024-03-27 + Details
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