XML 209 R166.htm IDEA: XBRL DOCUMENT v3.25.3

Employee Compensation - Pension and Other Employee Future Benefits - Summary of Changes in Estimated Financial Positions of Defined Benefit Pension Plans and Other Employee Future Benefit Plans (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Oct. 31, 2025 CAD ($)
Disclosure of defined benefit plans [line items]
Pre tax for impact of transfer of pension defined benefit plans	$ 0
Pension Plan [Member]
Disclosure of defined benefit plans [line items]
Deferred tax liability (asset)	$ 0

X

- Definition

Pre tax for impact of transfer of pension defined benefit plans.

+ References

No definition available.

+ Details

Name:	bmo_PreTaxForImpactOfTransferOfPensionDefinedBenefitPlans
Namespace Prefix:	bmo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2024-01-01
-Paragraph 81
-Subparagraph g
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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_DisclosureOfDefinedBenefitPlansLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=ifrs-full_PensionDefinedBenefitPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: