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Consolidated Statement of Income (Parenthetical) - CAD ($) $ in Millions	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Operating Income Expenses [abstract]
Interest income, calculated using the effective interest rate method	$ 7,136	$ 7,826

X

- Definition

Interest income on securities calculated using effective interest rate method.

+ References

No definition available.

+ Details

Name:	bmo_InterestIncomeOnSecuritiesCalculatedUsingEffectiveInterestRateMethod
Namespace Prefix:	bmo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

Operating Income Expenses [abstract]

+ References

No definition available.

+ Details

Name:	bmo_OperatingIncomeExpensesAbstract
Namespace Prefix:	bmo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration