XML 178 R135.htm IDEA: XBRL DOCUMENT
v3.25.3

Subordinated Debt - Summary of Maturities of Subordinated Debt and Repayment (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2025 CAD ($) | Oct. 31, 2025 USD ($) | Oct. 31, 2024 CAD ($)
Subordinated Liabilities [Line Items] |  |  |
Face value | $ 21,343,075 |  | $ 25,192,367
Total | 8,500 |  | 8,377
Subordinated debt [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Total | 8,500 |  | 8,377
Subordinated debt [member] | Debentures Series 20 [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value | $ 150 |  |
Maturity date | December 2025 to 2040 |  |
Interest rate (%) | 8.25% | 8.25% |
Redeemable at our option beginning in | Not redeemable |  |
Total | $ 147 |  | 147
Subordinated debt [member] | 3.803% Subordinated Notes due 2032 [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value |  | $ 1,250 |
Maturity date | December 2032 |  |
Interest rate (%) | 3.803% | 3.803% |
Subordinated Borrowings Reset Spread Rate | 1.43% |  |
Redeemable at our option beginning in | December 2027 |  |
Total | $ 1,656 |  | 1,602
Subordinated debt [member] | Series J Medium-Term Notes, Second Tranche [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value | $ 1,250 |  |
Maturity date | June 2030 |  |
Interest rate (%) | 2.077% | 2.077% |
Redeemable at our option beginning in | June 2025 |  |
Total |  |  | 1,237
Subordinated debt [member] | Series K Medium-Term Notes, First Tranche [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value | $ 1,000 |  |
Maturity date | July 2031 |  |
Interest rate (%) | 1.928% | 1.928% |
Redeemable at our option beginning in | July 2026 |  |
Total | $ 959 |  | 992
Subordinated debt [member] | 3.088% Subordinated Notes due 2037 [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value |  | $ 1,250 |
Maturity date | January 2037 |  |
Interest rate (%) | 3.088% | 3.088% |
Subordinated Borrowings Reset Spread Rate | 1.40% |  |
Redeemable at our option beginning in | January 2032 |  |
Total | $ 1,551 |  | 1,466
Subordinated debt [member] | Series L Medium-Term Notes, First Tranche [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value | $ 750 |  |
Maturity date | October 2032 |  |
Interest rate (%) | 6.534% | 6.534% |
Subordinated Borrowings Reset Spread Rate | 2.70% |  |
Redeemable at our option beginning in | October 2027 |  |
Total | $ 749 |  | 732
Subordinated debt [member] | Series M Medium-Term Notes, First Tranche [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value | $ 1,150 |  |
Maturity date | September 2033 |  |
Interest rate (%) | 6.034% | 6.034% |
Subordinated Borrowings Reset Spread Rate | 2.02% |  |
Redeemable at our option beginning in | September 2028 |  |
Total | $ 1,190 |  | 1,202
Subordinated debt [member] | Series M Medium-Term Notes, Second Tranche [member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value | $ 1,000 |  |
Maturity date | July 2034 |  |
Interest rate (%) | 4.976% | 4.976% |
Subordinated Borrowings Reset Spread Rate | 1.63% |  |
Redeemable at our option beginning in | July 2029 |  |
Total | $ 999 |  | $ 999
Subordinated debt [member] | Series N MediumTerm Notes, First Tranche [Member] |  |  |
Subordinated Liabilities [Line Items] |  |  |
Face value | $ 1,250 |  |
Maturity date | March 2035 |  |
Interest rate (%) | 4.077% | 4.077% |
Subordinated Borrowings Reset Spread Rate | 1.54% |  |
Redeemable at our option beginning in | March 2030 |  |
Total | $ 1,249 |  |

X
- Definition Subordinated borrowings earliest date of redemption at par value. + References No definition available. + Details
Name: | bmo_SubordinatedBorrowingsEarliestDateOfRedemptionAtParValue
Namespace Prefix: | bmo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Subordinated Borrowings Reset Spread Rate. + References No definition available. + Details
Name: | bmo_SubordinatedBorrowingsResetSpreadRate
Namespace Prefix: | bmo_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Subordinated Liabilities [Line Items] + References No definition available. + Details
Name: | bmo_SubordinatedLiabilitiesLineItems
Namespace Prefix: | bmo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_BorrowingsMaturity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + 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_NotionalAmount
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of liabilities that are subordinate to other liabilities with respect to claims. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_SubordinatedLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_TypesOfFinancialLiabilitiesAxis=bmo_SubordinatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_DebenturesSeries20Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_ThreePointEightZeroThreePercentageSubordinatedNotesDue2032Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_SeriesJMediumTermNotesSecondTrancheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_SeriesKMediumTermNotesFirstTrancheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_ThreePointZeroEightyEightPercentageSubordinatedNotesDue2037Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_SeriesLMediumTermNotesFirstTrancheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_SeriesMMediumTermNotesFirstTrancheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_SeriesMMediumtermNotesSecondTrancheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=bmo_SeriesNMediumtermNotesFirstTrancheMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |