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Financial Instruments - Risk Management - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of detailed information about financial instruments [line items] |  |  |
Market value of collateral accepted | [1] | $ 482,186 | $ 429,736
Assets acquired in exchange of loans |  | 221 | 312
Reverse repurchase agreements [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Market value of collateral accepted |  | 409,000 | 359,000
Standard securities borrowing agreements [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Market value of collateral accepted |  | 350,000 | 300,000
Collateral not sold or re-pledged |  | $ 67,000 | 60,000
Retail [member] | AIRB portfolio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Percentage of residential mortgage portfolio insured |  | 23.00% |
Percentage of residential mortgage portfolio uninsured to average loan value |  | 54.00% |
Retail [member] | Standardized portfolio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Credit risk exposure default amount |  | $ 130,000 | 127,000
Retail [member] | Standardized portfolio [member] | Real estate secured [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Credit risk exposure default amount |  | 67,000 | 64,000
Non retail [member] | Standardized portfolio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Credit risk exposure default amount |  | $ 105,000 | $ 93,000
Top of range [member] | Retail [member] | Standardized portfolio [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Secured mortgage loans to value ratio |  | 80.00% |
[1] | Includes assets that have been received from counterparties through normal course of business in securities financing and derivative transactions.

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- Definition Assets acquired in exchange of loans. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Assets not sold or repledged as collateral at fair value. + References No definition available. + Details
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- Definition Credit risk exposure at default amount. + References No definition available. + Details
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Period Type: | instant

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- Definition Percentage of residential mortgage portfolio insured. + References No definition available. + Details
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- Definition Percentage of residential mortgage portfolio uninsured to average loan value. + References No definition available. + Details
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- Definition Secured mortgaged loans to value ratio. + References No definition available. + Details
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- Definition The fair value of collateral sold or repledged that was permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 15 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_15_b&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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