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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
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