XML 146 R103.htm IDEA: XBRL DOCUMENT
v3.25.3

Derivative Instruments - Derivatives Designated As Fair Value Hedging Instruments, Hedged Items and Hedge Ineffectiveness (Detail) - Fair Value Hedges [member] - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | [1] | Oct. 31, 2024
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Carrying amount of hedging derivatives Asset | [2] | $ 786 | $ 1,464 | [3]
Carrying amount of hedging derivatives liabilities | [2] | (1,926) | (1,591) | [3]
Gains (Losses) on hedging derivatives used to calculate hedge ineffectiveness |  | (913) | (2,032) | [3]
Hedge ineffectiveness Gains (Losses) on hedged item used to calculate hedge ineffectiveness |  | 884 | 1,900 | [3]
Ineffectiveness recorded in non-interest revenue - other |  | (29) | (132) | [3]
Carrying amount of the hedged item | [4] | 56,606 | 53,241 | [3]
Active hedges |  | 1,386 | 527 | [3]
Discontinued hedges |  | (1,473) | (363) | [3]
Interest rate swap contract [member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Carrying amount of hedging derivatives Asset | [2] | 786 | 1,464 | [3]
Carrying amount of hedging derivatives liabilities | [2] | (1,926) | (1,589) | [3]
Cross Currency Swaps [Member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Carrying amount of hedging derivatives Asset | [2],[3] |  | 0 |
Carrying amount of hedging derivatives liabilities | [2],[3] |  | (2) |
Securities and loans [member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Gains (Losses) on hedging derivatives used to calculate hedge ineffectiveness |  | (1,204) | (3,266) | [3]
Hedge ineffectiveness Gains (Losses) on hedged item used to calculate hedge ineffectiveness |  | 1,170 | 3,117 | [3]
Ineffectiveness recorded in non-interest revenue - other |  | (34) | (149) | [3]
Carrying amount of the hedged item | [4] | 133,830 | 118,397 | [3]
Active hedges |  | 1,747 | 741 | [3]
Discontinued hedges |  | (1,902) | (1,293) | [3]
Deposits and subordinated debt [member] |  |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |  |
Gains (Losses) on hedging derivatives used to calculate hedge ineffectiveness |  | 291 | 1,234 | [3]
Hedge ineffectiveness Gains (Losses) on hedged item used to calculate hedge ineffectiveness |  | (286) | (1,217) | [3]
Ineffectiveness recorded in non-interest revenue - other |  | 5 | 17 | [3]
Carrying amount of the hedged item | [4] | (77,224) | (65,156) | [3]
Active hedges |  | (361) | (214) | [3]
Discontinued hedges |  | $ 429 | $ 930 | [3]
[1] | Includes the fair value of bond futures rounded down to $nil million as at October 31, 2025.
[2] | Represents the unrealized gains (losses) within derivative instruments in assets and liabilities, respectively, in our Consolidated Balance Sheet.
[3] | Includes the fair value of bond futures rounded down to $nil million as at October 31, 2024.
[4] | Represents the carrying value in our Consolidated Balance Sheet and includes amortized cost, before ACL, plus fair value hedge adjustments, except for FVOCI securities that are carried at fair value.

X
- Definition Carrying Amount Of Fair Value Hedge Net. + References No definition available. + Details
Name: | bmo_CarryingAmountOfFairValueHedgeNet
Namespace Prefix: | bmo_
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_DisclosureOfInformationAboutTermsAndConditionsOfHedgingInstrumentsAndHowTheyAffectFutureCashFlowsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_GainLossOnChangeInFairValueOfHedgedItemUsedAsBasisForRecognisingHedgeIneffectiveness
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The gain (loss) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_GainLossOnHedgeIneffectiveness
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_GainLossOnHedgeIneffectivenessRecognisedInProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_HedgingInstrumentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_HedgingInstrumentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ReserveOfCashFlowHedgesContinuingHedges
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A component of equity representing the reserve of cash flow hedges in relation to hedging relationships for which hedge accounting is no longer applied. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_b_iii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ReserveOfCashFlowHedgesHedgingRelationshipsForWhichHedgeAccountingIsNoLongerApplied
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_TypesOfHedgesAxis=ifrs-full_FairValueHedgesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateSwapContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=bmo_CrossCurrencySwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=bmo_SecuritiesAndLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=bmo_DepositsAndSubordinatedLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |