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Loans, Impaired Loans and Allowance for Credit Losses - Impaired Loans (Parenthetical) (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Impaired loans [abstract] |  |
Interest income recognized on impaired loans | $ 95 | $ 84

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- Definition Disclosure of impaired loans. + References No definition available. + Details
Name: | bns_ImpairedLoansAbstract
Namespace Prefix: | bns_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest income recognized on impaired loans. + References No definition available. + Details
Name: | bns_InterestIncomeRecognizedOnImpairedLoans
Namespace Prefix: | bns_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration