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v3.25.3

Loans, Impaired Loans and Allowance for Credit Losses - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Base case scenario [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
ACL (Stage 1 and Stage 2) | $ 5,313 | $ 4,682
Base case scenario [member] | Previously stated [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
ACL (Stage 1 and Stage 2) | 5,018 | 4,316
Pessimistic scenario [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
ACL (Stage 1 and Stage 2) | 786 | 942
Probability Weighted Scenarios [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
ACL (Stage 1 and Stage 2) | $ 801 | $ 693

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- Definition Allowance for Credit Losses on Performing Loans Stage One and Two IFRS9 + References No definition available. + Details
Name: | bns_AllowanceForCreditLossesOnPerformingLoansUnderStageOneAndTwoIFRS9
Namespace Prefix: | bns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
Name: | ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_MethodOfAssessmentOfExpectedCreditLossesAxis=bns_BaseCaseScenarioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=ifrs-full_PreviouslyStatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MethodOfAssessmentOfExpectedCreditLossesAxis=bns_PessimisticScenarioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MethodOfAssessmentOfExpectedCreditLossesAxis=bns_ProbabilityWeightedScenariosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |