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

X

- 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

X

- 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