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Cash and Deposits with Financial Institutions - Summary of Cash and Deposits with Financial Institutions (Parenthetical) (Detail) - CAD ($) $ in Millions | Oct. 31, 2025 | Oct. 31, 2024
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Cash and Deposits with Financial Institutions [member] |  |
Cash And Cash Equivalents And Short-term Deposits [line items] |  |
Net of allowances | $ 4 | $ 3

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- Definition Allowance for deposits. + References No definition available. + Details
Name: | bns_AllowanceForDeposits
Namespace Prefix: | bns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Cash And Cash Equivalents And Short-term Deposits [line items] + References No definition available. + Details
Name: | bns_CashAndCashEquivalentsAndShorttermDepositsLineItems
Namespace Prefix: | bns_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=bns_CashAndDepositsWithFinancialInstitutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |