XML 183 R140.htm IDEA: XBRL DOCUMENT
v3.25.3

Equity - Schedule of the Equity Instrument (Detail) $ in Millions, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 12, 2025 | Aug. 25, 2024 | Oct. 31, 2025 CAD ($) | Oct. 31, 2024 CAD ($) | Oct. 31, 2025 USD ($) | Oct. 31, 2025 CAD ($) | Jul. 29, 2025 USD ($)
Other Equity Instruments [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Total |  |  | $ 7,406 | $ 6,037 |  |  |
4.8% AT1 Capital Notes (NVCC) [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Face value |  |  |  |  | $ 500 |  |
Interest rate (%) |  | 4.80% | 6.709% |  |  |  |
Redeemable at our option |  |  | Feb. 01, 2026 |  |  |  |
Total |  |  | $ 658 | 658 |  |  |
4.300% LRCNs, Series 1 [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Interest rate (%) | 4.30% |  |  |  |  |  |
4.300% LRCNs, Series 1 [member] | Other Equity Instruments [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Face value |  |  |  |  |  | $ 1,250 |
Interest rate (%) |  |  | 4.30% |  |  |  |
Redeemable at our option |  |  | Nov. 30, 2025 |  |  |  |
Total |  |  | $ 1,250 | 1,250 |  |  |
5.625% LRCNs, Series 2 [member] | Other Equity Instruments [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Face value |  |  |  |  |  | 750 |
Interest rate (%) |  |  | 5.625% |  |  |  |
Redeemable at our option |  |  | May 31, 2027 |  |  |  |
Total |  |  | $ 750 | 750 |  |  |
7.325% LRCNs, Series 3 [member] | Other Equity Instruments [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Face value |  |  |  |  |  | $ 1,000 |
Interest rate (%) |  |  | 7.325% |  |  |  |
Redeemable at our option |  |  | Nov. 30, 2027 |  |  |  |
Total |  |  | $ 1,000 | 1,000 |  |  |
7.700% LRCNs, Series 4 [member] | Other Equity Instruments [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Face value |  |  |  |  | 1,000 |  |
Interest rate (%) |  |  | 7.70% |  |  |  |
Redeemable at our option |  |  | May 31, 2029 |  |  |  |
Total |  |  | $ 1,356 | 1,356 |  |  |
7.300% LRCNs, Series 5 [member] | Other Equity Instruments [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Face value |  |  |  |  | 750 |  |
Interest rate (%) |  |  | 7.30% |  |  |  |
Redeemable at our option |  |  | Nov. 30, 2034 |  |  |  |
Total |  |  | $ 1,023 | $ 1,023 |  |  |
6.875% LRCNs, Series 6 [member] | Other Equity Instruments [member] |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |
Face value |  |  |  |  | $ 1,000 |  | $ 1,000
Interest rate (%) |  |  | 6.875% |  |  |  |
Redeemable at our option |  |  | Nov. 30, 2030 |  |  |  |
Total |  |  | $ 1,369 |  |  |  |

X
- Definition Compound instrument interest rate + References No definition available. + Details
Name: | bmo_CompoundInstrumentInterestRate
Namespace Prefix: | bmo_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The Cash inflow from issuing preferrence shares and other equity instruments. + References No definition available. + Details
Name: | bmo_ProceedsfromissueofpreferencesharesotherEquityInstruments
Namespace Prefix: | bmo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Redeemable option date + References No definition available. + Details
Name: | bmo_RedeemableOptionDate
Namespace Prefix: | bmo_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The amount of notes and debentures 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_NotesAndDebenturesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=bmo_OtherEquityInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bmo_DebtInstrument1Axis=bmo_FourPointEightPercentageAdditionalTier1CapitalNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bmo_DebtInstrument1Axis=bmo_FourPointThreePercentageLimitedRecourseCapitalNotesSeriesOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bmo_DebtInstrument1Axis=bmo_FivePointSixTwoFivePercentageLimitedRecourseCapitalNotesSeriesTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bmo_DebtInstrument1Axis=bmo_SevenPointThreeTwoFivePercentageLimitedRecourseCapitalNotesSeriesThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bmo_DebtInstrument1Axis=bmo_SevenPointSevenPercentageLimitedRecourseCapitalNotesSeriesFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bmo_DebtInstrument1Axis=bmo_SevenPointThreePercentageLimitedRecourseCapitalNotesSeriesFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bmo_DebtInstrument1Axis=bmo_SixPointEightSevenFivePercentageLimitedRecourseCapitalNotesSeriesSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |