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Deposits - Additional Information (Detail) - CAD ($) $ in Millions	Oct. 31, 2025	Oct. 31, 2024
Disclosure Of Deposits [Line Items]
Deposits eligible for early redemption without penalty	$ 27,819	$ 29,136
Commercial paper	43,617	51,500
Covered bonds	$ 24,053	$ 26,957

X

- Definition

Commercial papers issued by the entity.

+ References

No definition available.

+ Details

Name:	bmo_CommercialPaper1
Namespace Prefix:	bmo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Deposit eligible for early redemption without penalty.

+ References

No definition available.

+ Details

Name:	bmo_DepositEligibleForEarlyRedemptionWithoutPenalty
Namespace Prefix:	bmo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disclosure Of Deposits [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

The amount of bonds issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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