3.25.0.1 html 1028 368 1 true 172 0 false 9 false false R1.htm 1001 - Document - Cover Page Sheet http://www.bmo.com/role/CoverPage Cover Page Cover 1 false false R2.htm 1002 - Statement - Consolidated Statement of Income Sheet http://www.bmo.com/role/ConsolidatedStatementOfIncome Consolidated Statement of Income Statements 2 false false R3.htm 1003 - Statement - Consolidated Statement of Comprehensive Income Sheet http://www.bmo.com/role/ConsolidatedStatementOfComprehensiveIncome Consolidated Statement of Comprehensive Income Statements 3 false false R4.htm 1004 - Statement - Consolidated Statement of Comprehensive Income (Parenthetical) Sheet http://www.bmo.com/role/ConsolidatedStatementOfComprehensiveIncomeParenthetical Consolidated Statement of Comprehensive Income (Parenthetical) Statements 4 false false R5.htm 1005 - Statement - Consolidated Balance Sheet Sheet http://www.bmo.com/role/ConsolidatedBalanceSheet Consolidated Balance Sheet Statements 5 false false R6.htm 1006 - Statement - Consolidated Statement of Changes in Equity Sheet http://www.bmo.com/role/ConsolidatedStatementOfChangesInEquity Consolidated Statement of Changes in Equity Statements 6 false false R7.htm 1007 - Statement - Consolidated Statement of Cash Flows Sheet http://www.bmo.com/role/ConsolidatedStatementOfCashFlows Consolidated Statement of Cash Flows Statements 7 false false R8.htm 1008 - Disclosure - Basis of Presentation Sheet http://www.bmo.com/role/BasisOfPresentation Basis of Presentation Notes 8 false false R9.htm 1009 - Disclosure - Securities Sheet http://www.bmo.com/role/Securities Securities Notes 9 false false R10.htm 1010 - Disclosure - Loans and Allowance for Credit Losses Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLosses Loans and Allowance for Credit Losses Notes 10 false false R11.htm 1011 - Disclosure - Deposits Sheet http://www.bmo.com/role/Deposits Deposits Notes 11 false false R12.htm 1012 - Disclosure - Insurance Sheet http://www.bmo.com/role/Insurance Insurance Notes 12 false false R13.htm 1013 - Disclosure - Equity Sheet http://www.bmo.com/role/Equity Equity Notes 13 false false R14.htm 1014 - Disclosure - Fair Value Measurements Sheet http://www.bmo.com/role/FairValueMeasurements Fair Value Measurements Notes 14 false false R15.htm 1015 - Disclosure - Capital Management Sheet http://www.bmo.com/role/CapitalManagement Capital Management Notes 15 false false R16.htm 1016 - Disclosure - Employee Compensation Sheet http://www.bmo.com/role/EmployeeCompensation Employee Compensation Notes 16 false false R17.htm 1017 - Disclosure - Earnings Per Share Sheet http://www.bmo.com/role/EarningsPerShare Earnings Per Share Notes 17 false false R18.htm 1018 - Disclosure - Income Taxes Sheet http://www.bmo.com/role/IncomeTaxes Income Taxes Notes 18 false false R19.htm 1019 - Disclosure - Operating Segmentation Sheet http://www.bmo.com/role/OperatingSegmentation Operating Segmentation Notes 19 false false R20.htm 1020 - Disclosure - Securities (Tables) Sheet http://www.bmo.com/role/SecuritiesTables Securities (Tables) Tables http://www.bmo.com/role/Securities 20 false false R21.htm 1021 - Disclosure - Loans and Allowance for Credit Losses (Tables) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesTables Loans and Allowance for Credit Losses (Tables) Tables http://www.bmo.com/role/LoansAndAllowanceForCreditLosses 21 false false R22.htm 1022 - Disclosure - Deposits (Tables) Sheet http://www.bmo.com/role/DepositsTables Deposits (Tables) Tables http://www.bmo.com/role/Deposits 22 false false R23.htm 1023 - Disclosure - Insurance (Tables) Sheet http://www.bmo.com/role/InsuranceTables Insurance (Tables) Tables http://www.bmo.com/role/Insurance 23 false false R24.htm 1024 - Disclosure - Equity (Tables) Sheet http://www.bmo.com/role/EquityTables Equity (Tables) Tables http://www.bmo.com/role/Equity 24 false false R25.htm 1025 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.bmo.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.bmo.com/role/FairValueMeasurements 25 false false R26.htm 1026 - Disclosure - Capital Management (Tables) Sheet http://www.bmo.com/role/CapitalManagementTables Capital Management (Tables) Tables http://www.bmo.com/role/CapitalManagement 26 false false R27.htm 1027 - Disclosure - Employee Compensation (Tables) Sheet http://www.bmo.com/role/EmployeeCompensationTables Employee Compensation (Tables) Tables http://www.bmo.com/role/EmployeeCompensation 27 false false R28.htm 1028 - Disclosure - Earnings Per Share (Tables) Sheet http://www.bmo.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://www.bmo.com/role/EarningsPerShare 28 false false R29.htm 1029 - Disclosure - Operating Segmentation (Tables) Sheet http://www.bmo.com/role/OperatingSegmentationTables Operating Segmentation (Tables) Tables http://www.bmo.com/role/OperatingSegmentation 29 false false R30.htm 1030 - Disclosure - Securities - Summary of Classification of Securities (Detail) Sheet http://www.bmo.com/role/SecuritiesSummaryOfClassificationOfSecuritiesDetail Securities - Summary of Classification of Securities (Detail) Details 30 false false R31.htm 1031 - Disclosure - Securities - Summary of Classification of Securities (Parenthetical) (Detail) Sheet http://www.bmo.com/role/SecuritiesSummaryOfClassificationOfSecuritiesParentheticalDetail Securities - Summary of Classification of Securities (Parenthetical) (Detail) Details 31 false false R32.htm 1032 - Disclosure - Securities - Summary of Amortized Cost Securities (Detail) Sheet http://www.bmo.com/role/SecuritiesSummaryOfAmortizedCostSecuritiesDetail Securities - Summary of Amortized Cost Securities (Detail) Details 32 false false R33.htm 1033 - Disclosure - Securities - Schedule of Unrealized Gains and Losses (Detail) Sheet http://www.bmo.com/role/SecuritiesScheduleOfUnrealizedGainsAndLossesDetail Securities - Schedule of Unrealized Gains and Losses (Detail) Details 33 false false R34.htm 1034 - Disclosure - Securities - Summary of Interest Income Calculated Using Effective Interest Method (Detail) Sheet http://www.bmo.com/role/SecuritiesSummaryOfInterestIncomeCalculatedUsingEffectiveInterestMethodDetail Securities - Summary of Interest Income Calculated Using Effective Interest Method (Detail) Details 34 false false R35.htm 1035 - Disclosure - Securities - Summary of Non-Interest Revenue (Detail) Sheet http://www.bmo.com/role/SecuritiesSummaryOfNonInterestRevenueDetail Securities - Summary of Non-Interest Revenue (Detail) Details 35 false false R36.htm 1036 - Disclosure - Securities - Summary of Interest and Dividend Income and Gains on Securities (Detail) Sheet http://www.bmo.com/role/SecuritiesSummaryOfInterestAndDividendIncomeAndGainsOnSecuritiesDetail Securities - Summary of Interest and Dividend Income and Gains on Securities (Detail) Details 36 false false R37.htm 1037 - Disclosure - Loans and Allowance for Credit Losses - Additional Information (Detail) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesAdditionalInformationDetail Loans and Allowance for Credit Losses - Additional Information (Detail) Details 37 false false R38.htm 1038 - Disclosure - Loans and Allowance for Credit Losses - Summary of Continuity in Loss Allowance by Each Product Type (Detail) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesSummaryOfContinuityInLossAllowanceByEachProductTypeDetail Loans and Allowance for Credit Losses - Summary of Continuity in Loss Allowance by Each Product Type (Detail) Details 38 false false R39.htm 1039 - Disclosure - Loans and Allowance for Credit Losses - Summary of Continuity in Loss Allowance by Each Product Type (Parenthetical) (Detail) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesSummaryOfContinuityInLossAllowanceByEachProductTypeParentheticalDetail Loans and Allowance for Credit Losses - Summary of Continuity in Loss Allowance by Each Product Type (Parenthetical) (Detail) Details 39 false false R40.htm 1040 - Disclosure - Loans and Allowance for Credit Losses - Summary of Credit Risk Exposures for Loans Carried at Amortized Cost, FVOCI or FVTPL (Detail) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesSummaryOfCreditRiskExposuresForLoansCarriedAtAmortizedCostFvociOrFvtplDetail Loans and Allowance for Credit Losses - Summary of Credit Risk Exposures for Loans Carried at Amortized Cost, FVOCI or FVTPL (Detail) Details 40 false false R41.htm 1041 - Disclosure - Loans and Allowance for Credit Losses - Summary of Credit Risk Exposures for Loans Carried at Amortized Cost, FVOCI or FVTPL (Parenthetical) (Detail) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesSummaryOfCreditRiskExposuresForLoansCarriedAtAmortizedCostFvociOrFvtplParentheticalDetail Loans and Allowance for Credit Losses - Summary of Credit Risk Exposures for Loans Carried at Amortized Cost, FVOCI or FVTPL (Parenthetical) (Detail) Details 41 false false R42.htm 1042 - Disclosure - Loans and Allowance for Credit Losses - Summary of Loans that are Past Due but not Classified as Impaired (Detail) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesSummaryOfLoansThatArePastDueButNotClassifiedAsImpairedDetail Loans and Allowance for Credit Losses - Summary of Loans that are Past Due but not Classified as Impaired (Detail) Details 42 false false R43.htm 1043 - Disclosure - Loans and Allowance for Credit Losses - Summary of Loans that are Past Due but not Classified as Impaired (Parenthetical) (Detail) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesSummaryOfLoansThatArePastDueButNotClassifiedAsImpairedParentheticalDetail Loans and Allowance for Credit Losses - Summary of Loans that are Past Due but not Classified as Impaired (Parenthetical) (Detail) Details 43 false false R44.htm 1044 - Disclosure - Loans and Allowance for Credit Losses - Summary of Key Economic Variables Used to Estimate Allowance on Performing Loans During Forecast Period (Detail) Sheet http://www.bmo.com/role/LoansAndAllowanceForCreditLossesSummaryOfKeyEconomicVariablesUsedToEstimateAllowanceOnPerformingLoansDuringForecastPeriodDetail Loans and Allowance for Credit Losses - Summary of Key Economic Variables Used to Estimate Allowance on Performing Loans During Forecast Period (Detail) Details 44 false false R45.htm 1045 - Disclosure - Deposits - Summary of Deposits (Detail) Sheet http://www.bmo.com/role/DepositsSummaryOfDepositsDetail Deposits - Summary of Deposits (Detail) Details 45 false false R46.htm 1046 - Disclosure - Deposits - Summary of Deposits (Parenthetical) (Detail) Sheet http://www.bmo.com/role/DepositsSummaryOfDepositsParentheticalDetail Deposits - Summary of Deposits (Parenthetical) (Detail) Details 46 false false R47.htm 1047 - Disclosure - Deposits - Summary of Deposits payable on a fixed (Detail) Sheet http://www.bmo.com/role/DepositsSummaryOfDepositsPayableOnAFixedDetail Deposits - Summary of Deposits payable on a fixed (Detail) Details 47 false false R48.htm 1048 - Disclosure - Deposits - Summary of maturity schedule for deposits greater than one hundred thousand dollars booked in Canada (Detail) Sheet http://www.bmo.com/role/DepositsSummaryOfMaturityScheduleForDepositsGreaterThanOneHundredThousandDollarsBookedInCanadaDetail Deposits - Summary of maturity schedule for deposits greater than one hundred thousand dollars booked in Canada (Detail) Details 48 false false R49.htm 1049 - Disclosure - Insurance - Summary of Insurance Service Results (Detail) Sheet http://www.bmo.com/role/InsuranceSummaryOfInsuranceServiceResultsDetail Insurance - Summary of Insurance Service Results (Detail) Details 49 false false R50.htm 1050 - Disclosure - Insurance - Summary of Insurance Investment Results (Detail) Sheet http://www.bmo.com/role/InsuranceSummaryOfInsuranceInvestmentResultsDetail Insurance - Summary of Insurance Investment Results (Detail) Details 50 false false R51.htm 1051 - Disclosure - Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Detail) Sheet http://www.bmo.com/role/InsuranceSummaryOfTheInsuranceLiabilityByRemainingCoverageAndIncurredClaimsDetail Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Detail) Details 51 false false R52.htm 1052 - Disclosure - Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Parenthetical) (Detail) Sheet http://www.bmo.com/role/InsuranceSummaryOfTheInsuranceLiabilityByRemainingCoverageAndIncurredClaimsParentheticalDetail Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Parenthetical) (Detail) Details 52 false false R53.htm 1053 - Disclosure - Insurance - Summary of Yield Curve Used to Discount Cash Flows that do not Vary Based on Underlying Items (Detail) Sheet http://www.bmo.com/role/InsuranceSummaryOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnUnderlyingItemsDetail Insurance - Summary of Yield Curve Used to Discount Cash Flows that do not Vary Based on Underlying Items (Detail) Details 53 false false R54.htm 1054 - Disclosure - Insurance - Additional Information (Detail) Sheet http://www.bmo.com/role/InsuranceAdditionalInformationDetail Insurance - Additional Information (Detail) Details 54 false false R55.htm 1055 - Disclosure - Equity - Summary of Classes of Preferred and Common Shares Outstanding (Detail) Sheet http://www.bmo.com/role/EquitySummaryOfClassesOfPreferredAndCommonSharesOutstandingDetail Equity - Summary of Classes of Preferred and Common Shares Outstanding (Detail) Details 55 false false R56.htm 1056 - Disclosure - Equity - Summary of Classes of Preferred and Common Shares Outstanding (Parenthetical) (Detail) Sheet http://www.bmo.com/role/EquitySummaryOfClassesOfPreferredAndCommonSharesOutstandingParentheticalDetail Equity - Summary of Classes of Preferred and Common Shares Outstanding (Parenthetical) (Detail) Details 56 false false R57.htm 1057 - Disclosure - Equity - Additional Information (Detail) Sheet http://www.bmo.com/role/EquityAdditionalInformationDetail Equity - Additional Information (Detail) Details 57 false false R58.htm 1058 - Disclosure - Fair Value Measurements - Summary of Financial Instruments Designated At Fair Value Through Profit Or Loss (Detail) Sheet http://www.bmo.com/role/FairValueMeasurementsSummaryOfFinancialInstrumentsDesignatedAtFairValueThroughProfitOrLossDetail Fair Value Measurements - Summary of Financial Instruments Designated At Fair Value Through Profit Or Loss (Detail) Details 58 false false R59.htm 1059 - Disclosure - Fair Value Measurements - Summary of Financial Instruments Designated At Fair Value Through Profit Or Loss (Parenthetical) (Detail) Sheet http://www.bmo.com/role/FairValueMeasurementsSummaryOfFinancialInstrumentsDesignatedAtFairValueThroughProfitOrLossParentheticalDetail Fair Value Measurements - Summary of Financial Instruments Designated At Fair Value Through Profit Or Loss (Parenthetical) (Detail) Details 59 false false R60.htm 1060 - Disclosure - Fair Value Measurements - Summary of Fair Value Measurement of Assets And Liabilities (Detail) Sheet http://www.bmo.com/role/FairValueMeasurementsSummaryOfFairValueMeasurementOfAssetsAndLiabilitiesDetail Fair Value Measurements - Summary of Fair Value Measurement of Assets And Liabilities (Detail) Details 60 false false R61.htm 1061 - Disclosure - Fair Value Measurements - Summary of Fair Value Measurement of Assets And Liabilities (Parenthetical) (Detail) Sheet http://www.bmo.com/role/FairValueMeasurementsSummaryOfFairValueMeasurementOfAssetsAndLiabilitiesParentheticalDetail Fair Value Measurements - Summary of Fair Value Measurement of Assets And Liabilities (Parenthetical) (Detail) Details 61 false false R62.htm 1062 - Disclosure - Fair Value Measurements - Significant Unobservable Inputs in Level 3 Instrument Valuations (Detail) Sheet http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsInLevel3InstrumentValuationsDetail Fair Value Measurements - Significant Unobservable Inputs in Level 3 Instrument Valuations (Detail) Details 62 false false R63.htm 1063 - Disclosure - Fair Value Measurements - Summary of Significant Transfers Between Level 1 to Level 2 (Detail) Sheet http://www.bmo.com/role/FairValueMeasurementsSummaryOfSignificantTransfersBetweenLevel1ToLevel2Detail Fair Value Measurements - Summary of Significant Transfers Between Level 1 to Level 2 (Detail) Details 63 false false R64.htm 1064 - Disclosure - Fair Value Measurements - Summary of Changes in Level 3 Instruments Carried At Fair Value (Detail) Sheet http://www.bmo.com/role/FairValueMeasurementsSummaryOfChangesInLevel3InstrumentsCarriedAtFairValueDetail Fair Value Measurements - Summary of Changes in Level 3 Instruments Carried At Fair Value (Detail) Details 64 false false R65.htm 1065 - Disclosure - Capital Management - Additional Information (Detail) Sheet http://www.bmo.com/role/CapitalManagementAdditionalInformationDetail Capital Management - Additional Information (Detail) Details 65 false false R66.htm 1066 - Disclosure - Capital Management - Summary of Regulatory Capital Measure and Risk-Weighted Assets (Detail) Sheet http://www.bmo.com/role/CapitalManagementSummaryOfRegulatoryCapitalMeasureAndRiskWeightedAssetsDetail Capital Management - Summary of Regulatory Capital Measure and Risk-Weighted Assets (Detail) Details 66 false false R67.htm 1067 - Disclosure - Employee Compensation - Share-Based Compensation - Additional Information (Detail) Sheet http://www.bmo.com/role/EmployeeCompensationShareBasedCompensationAdditionalInformationDetail Employee Compensation - Share-Based Compensation - Additional Information (Detail) Details 67 false false R68.htm 1068 - Disclosure - Employee Compensation - Summary of Ranges of Values used for each Option Pricing Assumption (Detail) Sheet http://www.bmo.com/role/EmployeeCompensationSummaryOfRangesOfValuesUsedForEachOptionPricingAssumptionDetail Employee Compensation - Summary of Ranges of Values used for each Option Pricing Assumption (Detail) Details 68 false false R69.htm 1069 - Disclosure - Employee Compensation - Summary of Pension and Other Employee Future Benefit Expenses (Detail) Sheet http://www.bmo.com/role/EmployeeCompensationSummaryOfPensionAndOtherEmployeeFutureBenefitExpensesDetail Employee Compensation - Summary of Pension and Other Employee Future Benefit Expenses (Detail) Details 69 false false R70.htm 1070 - Disclosure - Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Detail) Sheet http://www.bmo.com/role/EarningsPerShareSummaryOfBasicAndDilutedEarningsPerShareDetail Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Detail) Details 70 false false R71.htm 1071 - Disclosure - Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) Sheet http://www.bmo.com/role/EarningsPerShareSummaryOfBasicAndDilutedEarningsPerShareParentheticalDetail Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) Details 71 false false R72.htm 1072 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://www.bmo.com/role/IncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 72 false false R73.htm 1073 - Disclosure - Operating Segmentation - Additional Information (Detail) Sheet http://www.bmo.com/role/OperatingSegmentationAdditionalInformationDetail Operating Segmentation - Additional Information (Detail) Details 73 false false R74.htm 1074 - Disclosure - Operating Segmentation - Summary of Average Assets, Grouped by Operating Segment (Detail) Sheet http://www.bmo.com/role/OperatingSegmentationSummaryOfAverageAssetsGroupedByOperatingSegmentDetail Operating Segmentation - Summary of Average Assets, Grouped by Operating Segment (Detail) Details 74 false false R75.htm 1075 - Disclosure - Operating Segmentation - Summary of Average Assets, Grouped by Operating Segment (Parenthetical) (Detail) Sheet http://www.bmo.com/role/OperatingSegmentationSummaryOfAverageAssetsGroupedByOperatingSegmentParentheticalDetail Operating Segmentation - Summary of Average Assets, Grouped by Operating Segment (Parenthetical) (Detail) Details 75 false false All Reports Book All Reports bmo-20250131.xsd bmo-20250131_cal.xml bmo-20250131_def.xml bmo-20250131_lab.xml bmo-20250131_pre.xml d884868d6k.htm d884868dex992.htm http://xbrl.sec.gov/dei/2024 https://xbrl.ifrs.org/taxonomy/2024-03-27/ifrs-full true true