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Financial Instruments - Risk Management - Summary of Subject to Market and Credit Risk With a Reconcilation (Parenthetical) (Detail) - CAD ($) $ in Billions | Oct. 31, 2025 | Oct. 31, 2024
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Disclosure of detailed information about financial instruments [abstract] |  |
Residential mortgage guaranteed loans | $ 52.8 | $ 56.3

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- Definition Residential mortgage guaranteed loans. + References No definition available. + Details
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Namespace Prefix: | bns_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialInstrumentsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration