{ "version": "2.2", "instance": { "bmo-20260430.htm bmo-20260430_d2.htm": { "nsprefix": "bmo", "nsuri": "http://www.bmo.com/20260430", "dts": { "inline": { "local": [ "bmo-20260430.htm", "bmo-20260430_d2.htm" ] }, "schema": { "local": [ "bmo-20260430.xsd" ], "remote": [ "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd", "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd", "http://www.xbrl.org/2003/xl-2003-12-31.xsd", "http://www.xbrl.org/2003/xlink-2003-12-31.xsd", "http://www.xbrl.org/2005/xbrldt-2005.xsd", "http://www.xbrl.org/2006/ref-2006-02-27.xsd", "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd", "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd", "https://www.xbrl.org/2023/calculation-1.1.xsd", "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd", "https://www.xbrl.org/dtr/type/2022-03-31/types.xsd", "https://www.xbrl.org/dtr/type/2024-01-31/types.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd", "https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/dimensions-ea/rol_ifrs_ea-dim_2025-03-27.xsd", "https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/dimensions/rol_full_ifrs-dim_2025-03-27.xsd", "https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd", "https://xbrl.sec.gov/country/2025/country-2025.xsd", "https://xbrl.sec.gov/currency/2025/currency-2025.xsd", "https://xbrl.sec.gov/dei/2025/dei-2025.xsd" ] }, "calculationLink": { "local": [ "bmo-20260430_cal.xml" ] }, "definitionLink": { "local": [ "bmo-20260430_def.xml" ], "remote": [ "https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/dimensions-ea/dim_ifrs_ea_2025-03-27_role-995000.xml", "https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/dimensions/dim_full_ifrs_2025-03-27_role-995000.xml" ] }, "labelLink": { "local": [ "bmo-20260430_lab.xml" ] }, "presentationLink": { "local": [ "bmo-20260430_pre.xml" ] } }, "keyStandard": 215, "keyCustom": 198, "axisStandard": 34, "axisCustom": 8, "memberStandard": 45, "memberCustom": 120, "hidden": { "total": 5, "http://xbrl.sec.gov/dei/2025": 5 }, "contextCount": 1450, "entityCount": 1, "segmentCount": 173, "elementCount": 753, "unitCount": 8, "baseTaxonomies": { "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full": 2349, "http://xbrl.sec.gov/dei/2025": 8 }, "report": { "R1": { "role": "http://www.bmo.com/role/CoverPage", "longName": "0000001 - Document - Cover Page", "shortName": "Cover Page", "isDefault": "true", "groupType": "document", "subGroupType": "", "menuCat": "Cover", "order": "1", "firstAnchor": { "contextRef": "c-1", "name": "dei:DocumentType", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "dei:DocumentType", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "span", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430.htm", "first": true, "unique": true } }, "R2": { "role": "http://www.bmo.com/role/ConsolidatedStatementofIncome", "longName": "9952151 - Statement - Consolidated Statement of Income", "shortName": "Consolidated Statement of Income", "isDefault": "false", "groupType": "statement", "subGroupType": "", "menuCat": "Statements", "order": "2", "firstAnchor": { "contextRef": "c-2", "name": "ifrs-full:InterestIncomeOnLoansAndAdvancesToCustomers", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "ifrs-full:InterestIncomeOnLoansAndAdvancesToCustomers", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R3": { "role": "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome", "longName": "9952153 - Statement - Consolidated Statement of Comprehensive Income", "shortName": "Consolidated Statement of Comprehensive Income", "isDefault": "false", "groupType": "statement", "subGroupType": "", "menuCat": "Statements", "order": "3", "firstAnchor": { "contextRef": "c-2", "name": "ifrs-full:ProfitLoss", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "ifrs-full:OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R4": { "role": "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical", "longName": "9952154 - Statement - Consolidated Statement of Comprehensive Income (Parenthetical)", "shortName": "Consolidated Statement of Comprehensive Income (Parenthetical)", "isDefault": "false", "groupType": "statement", "subGroupType": "parenthetical", "menuCat": "Statements", "order": "4", "firstAnchor": { "contextRef": "c-2", "name": "bmo:IncomeTaxRelatingToReclassificationToEarningsOnFairValueThroughOtherComprehensiveIncomeSecurities", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "link:footnote", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "bmo:IncomeTaxRelatingToReclassificationToEarningsOnFairValueThroughOtherComprehensiveIncomeSecurities", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "link:footnote", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R5": { "role": "http://www.bmo.com/role/ConsolidatedBalanceSheet", "longName": "9952156 - Statement - Consolidated Balance Sheet", "shortName": "Consolidated Balance Sheet", "isDefault": "false", "groupType": "statement", "subGroupType": "", "menuCat": "Statements", "order": "5", "firstAnchor": { "contextRef": "c-16", "name": "ifrs-full:CashAndCashEquivalents", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-16", "name": "ifrs-full:ShorttermDepositsNotClassifiedAsCashEquivalents", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R6": { "role": "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "longName": "9952157 - Statement - Consolidated Statement of Changes in Equity", "shortName": "Consolidated Statement of Changes in Equity", "isDefault": "false", "groupType": "statement", "subGroupType": "", "menuCat": "Statements", "order": "6", "firstAnchor": { "contextRef": "c-37", "name": "ifrs-full:Equity", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-37", "name": "ifrs-full:Equity", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R7": { "role": "http://www.bmo.com/role/ConsolidatedStatementofCashFlows", "longName": "9952158 - Statement - Consolidated Statement of Cash Flows", "shortName": "Consolidated Statement of Cash Flows", "isDefault": "false", "groupType": "statement", "subGroupType": "", "menuCat": "Statements", "order": "7", "firstAnchor": { "contextRef": "c-2", "name": "ifrs-full:ProfitLoss", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "bmo:AdjustmentsForNetGainLossOnSecuritiesOtherThanTrading", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R8": { "role": "http://www.bmo.com/role/ConsolidatedStatementofCashFlowsParenthetical", "longName": "9952159 - Statement - Consolidated Statement of Cash Flows (Parenthetical)", "shortName": "Consolidated Statement of Cash Flows (Parenthetical)", "isDefault": "false", "groupType": "statement", "subGroupType": "parenthetical", "menuCat": "Statements", "order": "8", "firstAnchor": { "contextRef": "c-2", "name": "ifrs-full:CashAndCashEquivalentsInSubsidiaryOrBusinessesAcquiredOrDisposed2013", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "ifrs-full:CashAndCashEquivalentsInSubsidiaryOrBusinessesAcquiredOrDisposed2013", "link:footnote", "span", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "ifrs-full:CashAndCashEquivalentsInSubsidiaryOrBusinessesAcquiredOrDisposed2013", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "ifrs-full:CashAndCashEquivalentsInSubsidiaryOrBusinessesAcquiredOrDisposed2013", "link:footnote", "span", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R9": { "role": "http://www.bmo.com/role/BasisofPresentation", "longName": "9952160 - Disclosure - Basis of Presentation", "shortName": "Basis of Presentation", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "9", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R10": { "role": "http://www.bmo.com/role/Securities", "longName": "9952161 - Disclosure - Securities", "shortName": "Securities", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "10", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfSecuritiesExplanatoryTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfSecuritiesExplanatoryTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R11": { "role": "http://www.bmo.com/role/LoansandAllowanceforCreditLosses", "longName": "9952162 - Disclosure - Loans and Allowance for Credit Losses", "shortName": "Loans and Allowance for Credit Losses", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "11", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfLoansAndAdvancesToCustomersExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfLoansAndAdvancesToCustomersExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R12": { "role": "http://www.bmo.com/role/DepositsandSubordinatedDebt", "longName": "9952163 - Disclosure - Deposits and Subordinated Debt", "shortName": "Deposits and Subordinated Debt", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "12", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfDepositsAndSubordinatedLiabilitiesExplanatoryTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfDepositsAndSubordinatedLiabilitiesExplanatoryTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R13": { "role": "http://www.bmo.com/role/Insurance", "longName": "9952164 - Disclosure - Insurance", "shortName": "Insurance", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "13", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfInsuranceContractsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfInsuranceContractsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R14": { "role": "http://www.bmo.com/role/Equity", "longName": "9952165 - Disclosure - Equity", "shortName": "Equity", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "14", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R15": { "role": "http://www.bmo.com/role/FairValueMeasurements", "longName": "9952166 - Disclosure - Fair Value Measurements", "shortName": "Fair Value Measurements", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "15", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfFairValueMeasurementExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfFairValueMeasurementExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R16": { "role": "http://www.bmo.com/role/CapitalManagement", "longName": "9952167 - Disclosure - Capital Management", "shortName": "Capital Management", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "16", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfCapitalManagementTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfCapitalManagementTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R17": { "role": "http://www.bmo.com/role/EmployeeCompensation", "longName": "9952168 - Disclosure - Employee Compensation", "shortName": "Employee Compensation", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "17", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R18": { "role": "http://www.bmo.com/role/EarningsPerShare", "longName": "9952169 - Disclosure - Earnings Per Share", "shortName": "Earnings Per Share", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "18", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfEarningsPerShareExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfEarningsPerShareExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R19": { "role": "http://www.bmo.com/role/IncomeTaxes", "longName": "9952170 - Disclosure - Income Taxes", "shortName": "Income Taxes", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "19", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfIncomeTaxExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfIncomeTaxExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R20": { "role": "http://www.bmo.com/role/OperatingSegmentation", "longName": "9952171 - Disclosure - Operating Segmentation", "shortName": "Operating Segmentation", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "20", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R21": { "role": "http://www.bmo.com/role/AcquisitionsandDivestitures", "longName": "9952172 - Disclosure - Acquisitions and Divestitures", "shortName": "Acquisitions and Divestitures", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "21", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfAcquisitionsAndDivestituresExplanatoryTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfAcquisitionsAndDivestituresExplanatoryTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R22": { "role": "http://www.bmo.com/role/SecuritiesTables", "longName": "9955511 - Disclosure - Securities (Tables)", "shortName": "Securities (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "22", "firstAnchor": { "contextRef": "c-1", "name": "bmo:ScheduleOfSecuritiesByClassificationExplanatoryTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:ScheduleOfSecuritiesByClassificationExplanatoryTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R23": { "role": "http://www.bmo.com/role/LoansandAllowanceforCreditLossesTables", "longName": "9955512 - Disclosure - Loans and Allowance for Credit Losses (Tables)", "shortName": "Loans and Allowance for Credit Losses (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "23", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfDetailedContinuityInformationAboutLossAllowanceByEachProductTypeTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfDetailedContinuityInformationAboutLossAllowanceByEachProductTypeTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R24": { "role": "http://www.bmo.com/role/DepositsandSubordinatedDebtTables", "longName": "9955513 - Disclosure - Deposits and Subordinated Debt (Tables)", "shortName": "Deposits and Subordinated Debt (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "24", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfDepositLiabilitiesTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfDepositLiabilitiesTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R25": { "role": "http://www.bmo.com/role/InsuranceTables", "longName": "9955514 - Disclosure - Insurance (Tables)", "shortName": "Insurance (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "25", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfInsuranceServiceResultExplanatoryTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfInsuranceServiceResultExplanatoryTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R26": { "role": "http://www.bmo.com/role/EquityTables", "longName": "9955515 - Disclosure - Equity (Tables)", "shortName": "Equity (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "26", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R27": { "role": "http://www.bmo.com/role/FairValueMeasurementsTables", "longName": "9955516 - Disclosure - Fair Value Measurements (Tables)", "shortName": "Fair Value Measurements (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "27", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfFairValuesOfFinancialInstrumentsNotCarriedAtFairValueOnBalanceSheetExplanatoryTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfFairValuesOfFinancialInstrumentsNotCarriedAtFairValueOnBalanceSheetExplanatoryTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R28": { "role": "http://www.bmo.com/role/CapitalManagementTables", "longName": "9955517 - Disclosure - Capital Management (Tables)", "shortName": "Capital Management (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "28", "firstAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfRegulatoryCapitalAndCapitalRatiosTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:DisclosureOfRegulatoryCapitalAndCapitalRatiosTableTextBlock", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R29": { "role": "http://www.bmo.com/role/EmployeeCompensationTables", "longName": "9955518 - Disclosure - Employee Compensation (Tables)", "shortName": "Employee Compensation (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "29", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R30": { "role": "http://www.bmo.com/role/EarningsPerShareTables", "longName": "9955519 - Disclosure - Earnings Per Share (Tables)", "shortName": "Earnings Per Share (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "30", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:EarningsPerShareExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ifrs-full:DisclosureOfEarningsPerShareExplanatory", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:EarningsPerShareExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ifrs-full:DisclosureOfEarningsPerShareExplanatory", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R31": { "role": "http://www.bmo.com/role/OperatingSegmentationTables", "longName": "9955520 - Disclosure - Operating Segmentation (Tables)", "shortName": "Operating Segmentation (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "31", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfOperatingSegmentsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfOperatingSegmentsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R32": { "role": "http://www.bmo.com/role/AcquisitionsandDivestituresTables", "longName": "9955521 - Disclosure - Acquisitions and Divestitures (Tables)", "shortName": "Acquisitions and Divestitures (Tables)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "tables", "menuCat": "Tables", "order": "32", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R33": { "role": "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails", "longName": "9955522 - Disclosure - Securities - Summary of Classification of Securities (Details)", "shortName": "Securities - Summary of Classification of Securities (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "33", "firstAnchor": { "contextRef": "c-16", "name": "bmo:NonTradingSecuritiesAtFairValueThroughProfitOrLoss", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:ScheduleOfSecuritiesByClassificationExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-16", "name": "bmo:BankSecuritiesCarryingAmount", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:ScheduleOfSecuritiesByClassificationExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R34": { "role": "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails", "longName": "9955523 - Disclosure - Securities - Summary of Amortized Cost Securities (Details)", "shortName": "Securities - Summary of Amortized Cost Securities (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "34", "firstAnchor": { "contextRef": "c-16", "name": "bmo:SecuritiesAtAmortizedCostNetOfAllowances", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-130", "name": "bmo:SecuritiesAtAmortizedCostNetOfAllowances", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R35": { "role": "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "longName": "9955524 - Disclosure - Securities - Schedule of Unrealized Gains and Losses (Details)", "shortName": "Securities - Schedule of Unrealized Gains and Losses (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "35", "firstAnchor": { "contextRef": "c-16", "name": "bmo:SecuritiesAtFairValueThroughOtherComprehensiveIncomeNetOfAllowances", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-224", "name": "bmo:SecuritiesAtFairValueThroughOtherComprehensiveIncomeNetOfAllowances", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfUnrealizedGainsAndLossesSecuritiesFVOCIExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R36": { "role": "http://www.bmo.com/role/SecuritiesSummaryofInterestIncomeCalculatedUsingEffectiveInterestMethodDetails", "longName": "9955525 - Disclosure - Securities - Summary of Interest Income Calculated Using Effective Interest Method (Details)", "shortName": "Securities - Summary of Interest Income Calculated Using Effective Interest Method (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "36", "firstAnchor": { "contextRef": "c-2", "name": "bmo:InterestDividendAndFeeIncome", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfInterestDividendAndFeeIncomeTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "bmo:InterestDividendAndFeeIncome", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfInterestDividendAndFeeIncomeTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R37": { "role": "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails", "longName": "9955526 - Disclosure - Securities - Summary of Non-Interest Revenue (Details)", "shortName": "Securities - Summary of Non-Interest Revenue (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "37", "firstAnchor": { "contextRef": "c-2", "name": "bmo:NonTradingSecuritiesAtFairValueThroughProfitOrLossNonInterestRevenue", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfNonInterestRevenueExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "bmo:NonTradingSecuritiesAtFairValueThroughProfitOrLossNonInterestRevenue", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfNonInterestRevenueExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R38": { "role": "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails", "longName": "9955527 - Disclosure - Securities - Summary of Interest and Dividend Income and Gains on Securities (Details)", "shortName": "Securities - Summary of Interest and Dividend Income and Gains on Securities (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "38", "firstAnchor": { "contextRef": "c-240", "name": "ifrs-full:InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureInTabularFormOfInterestAndDividendIncomeOnSecuritiesAndGainsOnSecuritiesInRespectOfInsuranceBusinessExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-240", "name": "ifrs-full:InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureInTabularFormOfInterestAndDividendIncomeOnSecuritiesAndGainsOnSecuritiesInRespectOfInsuranceBusinessExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R39": { "role": "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "longName": "9955528 - Disclosure - Loans and Allowance for Credit Losses - Additional Information (Details)", "shortName": "Loans and Allowance for Credit Losses - Additional Information (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "39", "firstAnchor": { "contextRef": "c-16", "name": "bmo:AllowanceForCreditLossesOnFinancialAssets", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-806", "name": "bmo:ScenarioWeighting", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "2", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R40": { "role": "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "longName": "9955529 - Disclosure - Loans and Allowance for Credit Losses - Summary of Continuity in Loss Allowance by Each Product Type (Details)", "shortName": "Loans and Allowance for Credit Losses - Summary of Continuity in Loss Allowance by Each Product Type (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "40", "firstAnchor": { "contextRef": "c-17", "name": "bmo:AllowanceForCreditLossesOnFinancialAssets", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-251", "name": "bmo:AllowanceForCreditLossesOnFinancialAssets", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R41": { "role": "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails", "longName": "9955530 - Disclosure - Loans and Allowance for Credit Losses - Summary of Credit Risk Exposures for Loans Carried at Amortized Cost, FVOCI or FVTPL (Details)", "shortName": "Loans and Allowance for Credit Losses - Summary of Credit Risk Exposures for Loans Carried at Amortized Cost, FVOCI or FVTPL (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "41", "firstAnchor": { "contextRef": "c-16", "name": "bmo:AllowanceForCreditLossesOnFinancialAssets", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-503", "name": "bmo:ExposureToCreditRiskOnLoansOrReceivables", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfLoansCreditRiskExposureExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R42": { "role": "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails", "longName": "9955531 - Disclosure - Loans and Allowance for Credit Losses - Summary of Loans that are Past Due but not Classified as Impaired (Details)", "shortName": "Loans and Allowance for Credit Losses - Summary of Loans that are Past Due but not Classified as Impaired (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "42", "firstAnchor": { "contextRef": "c-800", "name": "bmo:LoansPastDueButNotImpaired", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-800", "name": "bmo:LoansPastDueButNotImpaired", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R43": { "role": "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails", "longName": "9955532 - Disclosure - Loans and Allowance for Credit Losses - Summary of Key Economic Variables Used to Estimate Allowance on Performing Loans During Forecast Period (Details)", "shortName": "Loans and Allowance for Credit Losses - Summary of Key Economic Variables Used to Estimate Allowance on Performing Loans During Forecast Period (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "43", "firstAnchor": { "contextRef": "c-812", "name": "bmo:RealGrossDomesticProductGrowthRate", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "3", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfKeyEconomicVariablesUsedToEstimateAllowanceOnPerformingLoansDuringForecastPeriodExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-812", "name": "bmo:RealGrossDomesticProductGrowthRate", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "3", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfKeyEconomicVariablesUsedToEstimateAllowanceOnPerformingLoansDuringForecastPeriodExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R44": { "role": "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails", "longName": "9955533 - Disclosure - Deposits and Subordinated Debt - Summary of Deposits (Details)", "shortName": "Deposits and Subordinated Debt - Summary of Deposits (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "44", "firstAnchor": { "contextRef": "c-16", "name": "bmo:BalancesOnDemandDepositsFromCustomersInterestBearing", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfDepositLiabilitiesTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-16", "name": "bmo:BalancesOnDemandDepositsFromCustomersInterestBearing", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfDepositLiabilitiesTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R45": { "role": "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "longName": "9955534 - Disclosure - Deposits and Subordinated Debt - Summary of Deposits Payable on a Fixed (Details)", "shortName": "Deposits and Subordinated Debt - Summary of Deposits Payable on a Fixed (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "45", "firstAnchor": { "contextRef": "c-16", "name": "ifrs-full:BalancesOnTermDepositsFromCustomers", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfDepositLiabilitiesTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-872", "name": "ifrs-full:BalancesOnTermDepositsFromCustomers", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfDepositsPayableOnAFixedDateTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R46": { "role": "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails", "longName": "9955535 - Disclosure - Deposits and Subordinated Debt - Summary of Maturity Schedule for Deposits Greater than One Hundred Thousand Dollars Booked in Canada (Details)", "shortName": "Deposits and Subordinated Debt - Summary of Maturity Schedule for Deposits Greater than One Hundred Thousand Dollars Booked in Canada (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "46", "firstAnchor": { "contextRef": "c-16", "name": "bmo:Deposits1", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfDepositLiabilitiesTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-869", "name": "bmo:Deposits1", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfMaturityScheduleForDepositsGreaterThanOneHundredThousandDollarsBookedInCanadaTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R47": { "role": "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails", "longName": "9955536 - Disclosure - Deposits and Subordinated Debt - Additional Information (Details)", "shortName": "Deposits and Subordinated Debt - Additional Information (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "47", "firstAnchor": { "contextRef": "c-2", "name": "ifrs-full:RepaymentsOfSubordinatedLiabilities", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-885", "name": "ifrs-full:RepaymentsOfSubordinatedLiabilities", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R48": { "role": "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails", "longName": "9955537 - Disclosure - Insurance - Summary of Insurance Service Results (Details)", "shortName": "Insurance - Summary of Insurance Service Results (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "48", "firstAnchor": { "contextRef": "c-2", "name": "ifrs-full:InsuranceRevenue", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfInsuranceServiceResultExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "ifrs-full:InsuranceRevenue", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfInsuranceServiceResultExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R49": { "role": "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails", "longName": "9955538 - Disclosure - Insurance - Summary of Insurance Investment Results (Details)", "shortName": "Insurance - Summary of Insurance Investment Results (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "49", "firstAnchor": { "contextRef": "c-2", "name": "bmo:InsuranceInvestmentReturn", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfInsuranceInvestmentResultsExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "bmo:InsuranceInvestmentReturn", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfInsuranceInvestmentResultsExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R50": { "role": "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails", "longName": "9955539 - Disclosure - Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Details)", "shortName": "Insurance - Summary of the Insurance Liability by Remaining Coverage and Incurred Claims (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "50", "firstAnchor": { "contextRef": "c-119", "name": "ifrs-full:InsuranceContractsLiabilityAsset", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfReconciliationOfChangesInInsuranceContractsByRemainingCoverageAndIncurredClaimsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-119", "name": "ifrs-full:InsuranceContractsLiabilityAsset", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfReconciliationOfChangesInInsuranceContractsByRemainingCoverageAndIncurredClaimsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R51": { "role": "http://www.bmo.com/role/InsuranceAdditionalInformationDetails", "longName": "9955540 - Disclosure - Insurance - Additional Information (Details)", "shortName": "Insurance - Additional Information (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "51", "firstAnchor": { "contextRef": "c-2", "name": "bmo:OnerousContractLosses", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-5", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "bmo:OnerousContractLosses", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-5", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R52": { "role": "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails", "longName": "9955541 - Disclosure - Insurance - Summary of Yield Curve Used to Discount Cash Flows that do not Vary Based on Underlying Items (Details)", "shortName": "Insurance - Summary of Yield Curve Used to Discount Cash Flows that do not Vary Based on Underlying Items (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "52", "firstAnchor": { "contextRef": "c-916", "name": "ifrs-full:YieldUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItems", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "4", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItemsExplanatory", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-916", "name": "ifrs-full:YieldUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItems", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "4", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItemsExplanatory", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R53": { "role": "http://www.bmo.com/role/InsuranceSensitivityAnalysisDetails", "longName": "9955542 - Disclosure - Insurance - Sensitivity Analysis (Details)", "shortName": "Insurance - Sensitivity Analysis (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "53", "firstAnchor": { "contextRef": "c-16", "name": "bmo:IncreaseInProfitOrLossFromFiftyBasisPointIncreaseInInterestRates", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfSensitivityAnalysisToChangesInRiskExposuresThatAriseFromContractsWithinScopeOfIFRS17Explanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-16", "name": "bmo:IncreaseInProfitOrLossFromFiftyBasisPointIncreaseInInterestRates", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfSensitivityAnalysisToChangesInRiskExposuresThatAriseFromContractsWithinScopeOfIFRS17Explanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R54": { "role": "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails", "longName": "9955543 - Disclosure - Equity - Summary of Classes of Preferred and Common Shares Outstanding (Details)", "shortName": "Equity - Summary of Classes of Preferred and Common Shares Outstanding (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "54", "firstAnchor": { "contextRef": "c-16", "name": "ifrs-full:Equity", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-972", "name": "bmo:NumberOfSharesIssuedThroughAcquisitionOfSubsidiaryEquity", "unitRef": "shares", "xsiNil": "false", "lang": "en-US", "decimals": "0", "ancestors": [ "span", "div", "ix:continuation", "ifrs-full:DisclosureOfClassesOfShareCapitalExplanatory", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R55": { "role": "http://www.bmo.com/role/EquityAdditionalInformationDetails", "longName": "9955544 - Disclosure - Equity - Additional Information (Details)", "shortName": "Equity - Additional Information (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "55", "firstAnchor": { "contextRef": "c-973", "name": "bmo:NumberOfSharesRepurchaseUnderNormalCourseIssuerBid", "unitRef": "shares", "xsiNil": "false", "lang": "en-US", "decimals": "INF", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-973", "name": "bmo:NumberOfSharesRepurchaseUnderNormalCourseIssuerBid", "unitRef": "shares", "xsiNil": "false", "lang": "en-US", "decimals": "INF", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R56": { "role": "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "longName": "9955545 - Disclosure - Fair Value Measurements - Summary of Financial Instruments Designated at Fair Value Through Profit or Loss (Details)", "shortName": "Fair Value Measurements - Summary of Financial Instruments Designated at Fair Value Through Profit or Loss (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "56", "firstAnchor": { "contextRef": "c-16", "name": "bmo:SecuritiesAtAmortizedCostNetOfAllowances", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-985", "name": "bmo:SecuritizationAndStructuredEntitiesLiabilities", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "bmo:DisclosureOfFairValuesOfFinancialInstrumentsNotCarriedAtFairValueOnBalanceSheetExplanatoryTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R57": { "role": "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "longName": "9955546 - Disclosure - Fair Value Measurements - Summary of Fair Value Measurement of Assets and Liabilities (Details)", "shortName": "Fair Value Measurements - Summary of Fair Value Measurement of Assets and Liabilities (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "57", "firstAnchor": { "contextRef": "c-16", "name": "bmo:TradingSecuritiesAtFairValueThroughProfitOrLoss", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-1124", "name": "ifrs-full:InterestExpense", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "bmo:DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R58": { "role": "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "longName": "9955547 - Disclosure - Fair Value Measurements - Significant Unobservable Inputs in Level 3 Instrument Valuations (Details)", "shortName": "Fair Value Measurements - Significant Unobservable Inputs in Level 3 Instrument Valuations (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "58", "firstAnchor": { "contextRef": "c-1082", "name": "ifrs-full:FinancialLiabilitiesAtFairValue", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "bmo:OtherLiabilitiesAtFairValue", "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-1133", "name": "bmo:EVEBITDAMultipleSignificantUnobservableInputsAssets", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "0", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R59": { "role": "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "longName": "9955548 - Disclosure - Fair Value Measurements - Summary of Changes in Level 3 Instruments Carried at Fair Value (Details)", "shortName": "Fair Value Measurements - Summary of Changes in Level 3 Instruments Carried at Fair Value (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "59", "firstAnchor": { "contextRef": "c-1082", "name": "ifrs-full:FinancialLiabilitiesAtFairValue", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "bmo:OtherLiabilitiesAtFairValue", "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-1164", "name": "ifrs-full:FinancialAssetsAtFairValue", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R60": { "role": "http://www.bmo.com/role/CapitalManagementAdditionalInformationDetails", "longName": "9955549 - Disclosure - Capital Management - Additional Information (Details)", "shortName": "Capital Management - Additional Information (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "60", "firstAnchor": { "contextRef": "c-1", "name": "bmo:CapitalConservationBufferPercentage", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "3", "ancestors": [ "span", "div", "bmo:DisclosureOfCapitalManagementTextBlock", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:CapitalConservationBufferPercentage", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "3", "ancestors": [ "span", "div", "bmo:DisclosureOfCapitalManagementTextBlock", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R61": { "role": "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails", "longName": "9955550 - Disclosure - Capital Management - Summary of Regulatory Capital Measure and Risk-Weighted Assets (Details)", "shortName": "Capital Management - Summary of Regulatory Capital Measure and Risk-Weighted Assets (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "61", "firstAnchor": { "contextRef": "c-16", "name": "bmo:CommonEquityTierOneCapitalAmount", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfRegulatoryCapitalAndCapitalRatiosTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-16", "name": "bmo:CommonEquityTierOneCapitalAmount", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfRegulatoryCapitalAndCapitalRatiosTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R62": { "role": "http://www.bmo.com/role/EmployeeCompensationShareBasedCompensationAdditionalInformationDetails", "longName": "9955551 - Disclosure - Employee Compensation - Share-Based Compensation - Additional Information (Details)", "shortName": "Employee Compensation - Share-Based Compensation - Additional Information (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "62", "firstAnchor": { "contextRef": "c-1", "name": "ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement", "unitRef": "shares", "xsiNil": "false", "lang": "en-US", "decimals": "0", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement", "unitRef": "shares", "xsiNil": "false", "lang": "en-US", "decimals": "0", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R63": { "role": "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails", "longName": "9955552 - Disclosure - Employee Compensation - Summary of Ranges of Values used for each Option Pricing Assumption (Details)", "shortName": "Employee Compensation - Summary of Ranges of Values used for each Option Pricing Assumption (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "63", "firstAnchor": { "contextRef": "c-5", "name": "ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "3", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-5", "name": "ifrs-full:ExpectedDividendAsPercentageShareOptionsGranted", "unitRef": "number", "xsiNil": "false", "lang": "en-US", "decimals": "3", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R64": { "role": "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails", "longName": "9955553 - Disclosure - Employee Compensation - Summary of Pension and Other Employee Future Benefit Expenses (Details)", "shortName": "Employee Compensation - Summary of Pension and Other Employee Future Benefit Expenses (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "64", "firstAnchor": { "contextRef": "c-1355", "name": "ifrs-full:InterestExpenseIncomeNetDefinedBenefitLiabilityAsset", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "bmo:DisclosureOfPensionAndOtherPostEmploymentBenefitExpenseTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-1351", "name": "ifrs-full:CurrentServiceCostDefinedBenefitPlans", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "bmo:DisclosureOfPensionAndOtherPostEmploymentBenefitExpenseTableTextBlock", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R65": { "role": "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails", "longName": "9955554 - Disclosure - Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Details)", "shortName": "Earnings Per Share - Summary of Basic and Diluted Earnings Per Share (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "65", "firstAnchor": { "contextRef": "c-2", "name": "ifrs-full:ProfitLossAttributableToOwnersOfParent", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "ifrs-full:DividendsPaidOtherShares", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ix:continuation", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R66": { "role": "http://www.bmo.com/role/IncomeTaxesDetails", "longName": "9955555 - Disclosure - Income Taxes (Details)", "shortName": "Income Taxes (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "66", "firstAnchor": { "contextRef": "c-1", "name": "bmo:AdditionalIncomeTaxAndInterestAssessed", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "ifrs-full:DisclosureOfIncomeTaxExplanatory", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:AdditionalIncomeTaxAndInterestAssessed", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "ifrs-full:DisclosureOfIncomeTaxExplanatory", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R67": { "role": "http://www.bmo.com/role/OperatingSegmentationAdditionalInformationDetails", "longName": "9955556 - Disclosure - Operating Segmentation - Additional Information (Details)", "shortName": "Operating Segmentation - Additional Information (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "67", "firstAnchor": { "contextRef": "c-1", "name": "bmo:NumberOfOperatingGroups", "unitRef": "segment", "xsiNil": "false", "lang": "en-US", "decimals": "INF", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-1", "name": "bmo:NumberOfOperatingGroups", "unitRef": "segment", "xsiNil": "false", "lang": "en-US", "decimals": "INF", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R68": { "role": "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails", "longName": "9955557 - Disclosure - Operating Segmentation - Summary of Average Assets, Grouped by Operating Segment (Details)", "shortName": "Operating Segmentation - Summary of Average Assets, Grouped by Operating Segment (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "68", "firstAnchor": { "contextRef": "c-2", "name": "ifrs-full:InterestRevenueExpense", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfOperatingSegmentsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "c-2", "name": "ifrs-full:InterestRevenueExpense", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfOperatingSegmentsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true, "unique": true } }, "R69": { "role": "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails", "longName": "9955558 - Disclosure - Acquisitions and Divestitures - Additional Information (Details)", "shortName": "Acquisitions and Divestitures - Additional Information (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "69", "firstAnchor": { "contextRef": "c-16", "name": "ifrs-full:ContingentLiabilitiesRecognisedInBusinessCombination", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-1450", "name": "bmo:ExpectedImpactOfAssetsReclassifiedToHeldForSaleBeforeTax", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-8", "ancestors": [ "span", "div", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } }, "R70": { "role": "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails", "longName": "9955559 - Disclosure - Acquisitions and Divestitures - Summary of Assets Acquired and Liabilities Assumed (Details)", "shortName": "Acquisitions and Divestitures - Summary of Assets Acquired and Liabilities Assumed (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "70", "firstAnchor": { "contextRef": "c-1443", "name": "ifrs-full:IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "first": true }, "uniqueAnchor": { "contextRef": "c-1443", "name": "bmo:OtherAssetsRecognisedAsOfAcquisitionDate", "unitRef": "cad", "xsiNil": "false", "lang": "en-US", "decimals": "-6", "ancestors": [ "span", "td", "tr", "table", "div", "ifrs-full:DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory", "ix:continuation", "body", "html" ], "reportCount": 1, "baseRef": "bmo-20260430_d2.htm", "unique": true } } }, "tag": { "ifrs-full_AccumulatedOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AccumulatedOtherComprehensiveIncome", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_EquityAttributableToOwnersOfParent", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "verboseLabel": "Accumulated other comprehensive income", "label": "Accumulated other comprehensive income" } } }, "auth_ref": [ "r377" ] }, "bmo_AccumulatedOtherComprehensiveIncomeLossOnFairValueThroughOtherComprehensiveIncomeSecuritiesNetOfTaxesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AccumulatedOtherComprehensiveIncomeLossOnFairValueThroughOtherComprehensiveIncomeSecuritiesNetOfTaxesMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Accumulated Other Comprehensive Income (Loss) on Fair Value through OCI Securities, net of taxes", "label": "Accumulated Other Comprehensive Income loss On Fair Value Through Other Comprehensive Income Securities Net Of Taxes [Member]", "documentation": "Accumulated other comprehensive income loss on fair value through other comprehensive income securities net of taxes." } } }, "auth_ref": [] }, "bmo_AccumulatedOtherComprehensiveIncomeLossOnOwnCreditRiskOnFinancialLiabilitiesDesignatedAtFairValueNetOfTaxesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AccumulatedOtherComprehensiveIncomeLossOnOwnCreditRiskOnFinancialLiabilitiesDesignatedAtFairValueNetOfTaxesMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "verboseLabel": "Accumulated Other Comprehensive Income (Loss) on Own Credit Risk on Financial Liabilities Designated at Fair Value, net of taxes", "label": "Accumulated Other Comprehensive Income (Loss) on Own Credit Risk on Financial Liabilities Designated at Fair Value, net of taxes [Member]", "documentation": "Accumulated Other Comprehensive Income (Loss) on Own Credit Risk on Financial Liabilities Designated at Fair Value, net of taxes." } } }, "auth_ref": [] }, "ifrs-full_AccumulatedOtherComprehensiveIncomeMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AccumulatedOtherComprehensiveIncomeMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Total Accumulated Other Comprehensive Income", "label": "Accumulated other comprehensive income [member]" } }, "en": { "role": { "documentation": "This member stands for accumulated other comprehensive income. [Refer: Other comprehensive income]" } } }, "auth_ref": [ "r375" ] }, "bmo_AccumulatedOtherComprehensiveIncomeOnPensionAndOtherEmployeeFutureBenefitPlansNetOfTaxesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AccumulatedOtherComprehensiveIncomeOnPensionAndOtherEmployeeFutureBenefitPlansNetOfTaxesMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "verboseLabel": "Accumulated Other Comprehensive Income on Pension and Other Employee Future Benefit Plans, net of taxes", "label": "Accumulated Other Comprehensive Income on Pension and Other Employee Future Benefit Plans, net of taxes [Member]", "documentation": "Accumulated Other Comprehensive Income on Pension and Other Employee Future Benefit Plans, net of taxes [Member]." } } }, "auth_ref": [] }, "bmo_AccumulatedOtherComprehensiveIncomeOnTranslationOfNetForeignOperationsNetOfTaxesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AccumulatedOtherComprehensiveIncomeOnTranslationOfNetForeignOperationsNetOfTaxesMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Accumulated Other Comprehensive Income on Translation of Net Foreign Operations, net of taxes", "label": "Accumulated Other Comprehensive Income on Translation of Net Foreign Operations, net of taxes [Member]", "documentation": "Accumulated Other Comprehensive Income on Translation of Net Foreign Operations, net of taxes [Member]" } } }, "auth_ref": [] }, "bmo_AccumulatedOtherComprehensiveIncomelossOnCashFlowHedgesNetOfTaxesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AccumulatedOtherComprehensiveIncomelossOnCashFlowHedgesNetOfTaxesMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Accumulated Other Comprehensive Income (Loss) on Cash Flow Hedges, net of taxes", "label": "Accumulated Other Comprehensive Income Loss on Cash Flow Hedges net of taxes [Member]", "documentation": "Accumulated Other Comprehensive Income (Loss) on Cash Flow Hedges, net of taxes." } } }, "auth_ref": [] }, "ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AcquisitiondateFairValueOfTotalConsiderationTransferred", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Purchase price", "label": "Consideration transferred, acquisition-date fair value" } }, "en": { "role": { "documentation": "The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Total for all business combinations [member]]" } } }, "auth_ref": [ "r119", "r222" ] }, "bmo_AdditionalIncomeTaxAndInterestAssessed": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdditionalIncomeTaxAndInterestAssessed", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/IncomeTaxesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Additional income tax expense and interest", "label": "Additional Income Tax And Interest Assessed", "documentation": "Additional income tax expense and interest from CRA reassessment." } } }, "auth_ref": [] }, "ifrs-full_AdditionalPaidinCapital": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdditionalPaidinCapital", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_EquityAttributableToOwnersOfParent", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Contributed surplus", "label": "Additional paid-in capital" } }, "en": { "role": { "documentation": "The amount received or receivable from the issuance of the entity's shares in excess of nominal value and amounts received from other transactions involving the entity's stock or stockholders." } } }, "auth_ref": [ "r377" ] }, "ifrs-full_AdjustedWeightedAverageShares": { "xbrltype": "sharesItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustedWeightedAverageShares", "calculation": { "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Weighted-average number of diluted common shares outstanding (in shares)", "label": "Weighted average number of ordinary shares used in calculating diluted earnings per share" } }, "en": { "role": { "documentation": "The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]" } } }, "auth_ref": [ "r22" ] }, "bmo_AdjustmentForBrokersDealersAndClientsReceivableAndPayable": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentForBrokersDealersAndClientsReceivableAndPayable", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 19.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Brokers, dealers and clients receivable and payable", "label": "Adjustment For Brokers Dealers And Clients Receivable And Payable", "documentation": "Adjustment for brokers, dealers and clients receivable and payable." } } }, "auth_ref": [] }, "bmo_AdjustmentForIncreaseDecreaseInAccruedInterestReceivableAndPayable": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentForIncreaseDecreaseInAccruedInterestReceivableAndPayable", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": -1.0, "order": 21.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Accrued interest receivable and payable", "label": "Adjustment For Increase Decrease In Accrued Interest Receivable And Payable", "documentation": "Adjustment for increase decrease in accrued interest receivable and payable." } } }, "auth_ref": [] }, "bmo_AdjustmentForIncreaseDecreaseInCurrentIncomeTaxAssetsLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentForIncreaseDecreaseInCurrentIncomeTaxAssetsLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": -1.0, "order": 22.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Current income taxes", "label": "Adjustment For Increase Decrease In Current Income Tax Assets Liabilities", "documentation": "Adjustment for increase decrease in current income tax assets liabilities." } } }, "auth_ref": [] }, "bmo_AdjustmentsForAmortizationOfIntangibleAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForAmortizationOfIntangibleAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Amortization of intangible assets", "label": "Adjustments for amortization of intangible assets", "documentation": "Adjustments for amortization of intangible assets" } } }, "auth_ref": [] }, "ifrs-full_AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Derivative assets", "label": "Adjustments for decrease (increase) in derivative financial assets" } }, "en": { "role": { "documentation": "Adjustments for decrease (increase) in derivative financial assets to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Derivative financial assets; Profit (loss)]" } } }, "auth_ref": [ "r362" ] }, "ifrs-full_AdjustmentsForDecreaseIncreaseInLoansAndAdvancesToCustomers": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForDecreaseIncreaseInLoansAndAdvancesToCustomers", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 8.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Loans", "label": "Adjustments for decrease (increase) in loans and advances to customers" } }, "en": { "role": { "documentation": "Adjustments for decrease (increase) in loans and advances to customers to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Loans and advances to customers; Profit (loss)]" } } }, "auth_ref": [ "r362" ] }, "ifrs-full_AdjustmentsForDecreaseIncreaseInReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForDecreaseIncreaseInReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 11.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Securities borrowed or purchased under resale agreements", "label": "Adjustments for decrease (increase) in reverse repurchase agreements and cash collateral on securities borrowed" } }, "en": { "role": { "documentation": "Adjustments for decrease (increase) in reverse repurchase agreements and cash collateral on securities borrowed to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Reverse repurchase agreements and cash collateral on securities borrowed; Profit (loss)]" } } }, "auth_ref": [ "r362" ] }, "bmo_AdjustmentsForDecreaseIncreaseInSecuritiesSoldButNotYetPurchased": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForDecreaseIncreaseInSecuritiesSoldButNotYetPurchased", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 9.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Securities sold but not yet purchased", "label": "Adjustments For Decrease Increase In Securities Sold But Not Yet Purchased", "documentation": "Adjustments For Decrease Increase In Securities Sold But Not Yet Purchased" } } }, "auth_ref": [] }, "bmo_AdjustmentsForDecreaseIncreaseInSecuritizationAndStructuredEntitiesLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForDecreaseIncreaseInSecuritizationAndStructuredEntitiesLiabilities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 12.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Securitization and structured entities\u2019 liabilities", "label": "Adjustments For Decrease Increase In Securitization And Structured Entities Liabilities", "documentation": "Adjustments For Decrease Increase In Securitization And Structured Entities Liabilities" } } }, "auth_ref": [] }, "ifrs-full_AdjustmentsForDeferredTaxExpense": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForDeferredTaxExpense", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 16.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "verboseLabel": "Deferred taxes", "label": "Adjustments for deferred tax expense" } } }, "auth_ref": [ "r362" ] }, "bmo_AdjustmentsForDepreciationOfOtherAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForDepreciationOfOtherAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 15.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Depreciation of other assets", "label": "Adjustments For Depreciation Of Other Assets", "documentation": "Adjustments for depreciation of other assets." } } }, "auth_ref": [] }, "bmo_AdjustmentsForDepreciationOfPremisesAndEquipment": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForDepreciationOfPremisesAndEquipment", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "verboseLabel": "Depreciation of premises and equipment", "label": "Adjustments for Depreciation Of Premises and Equipment", "documentation": "Adjustments for depreciation of premises and equipment." } } }, "auth_ref": [] }, "ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 23.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Write-down of goodwill and intangible assets", "label": "Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss" } } }, "auth_ref": [ "r361" ] }, "ifrs-full_AdjustmentsForIncreaseDecreaseInDepositsFromCustomers": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForIncreaseDecreaseInDepositsFromCustomers", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 7.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits", "label": "Adjustments for increase (decrease) in deposits from customers" } }, "en": { "role": { "documentation": "Adjustments for increase (decrease) in deposits from customers to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Deposits from customers; Profit (loss)]" } } }, "auth_ref": [ "r362" ] }, "ifrs-full_AdjustmentsForIncreaseDecreaseInDerivativeFinancialLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForIncreaseDecreaseInDerivativeFinancialLiabilities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "verboseLabel": "Derivative liabilities", "label": "Adjustments for increase (decrease) in derivative financial liabilities" } }, "en": { "role": { "documentation": "Adjustments for increase (decrease) in derivative financial liabilities to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Derivative financial liabilities; Profit (loss)]" } } }, "auth_ref": [ "r362" ] }, "bmo_AdjustmentsForIncreaseDecreaseInInsuranceRelatedLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForIncreaseDecreaseInInsuranceRelatedLiabilities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 20.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance-related liabilities", "label": "Adjustments For Increase Decrease In Insurance Related Liabilities", "documentation": "Adjustments for increase decrease in insurance related liabilities." } } }, "auth_ref": [] }, "ifrs-full_AdjustmentsForIncreaseDecreaseInRepurchaseAgreementsAndCashCollateralOnSecuritiesLent": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForIncreaseDecreaseInRepurchaseAgreementsAndCashCollateralOnSecuritiesLent", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 10.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Securities lent or sold under repurchase agreements", "label": "Adjustments for increase (decrease) in repurchase agreements and cash collateral on securities lent" } }, "en": { "role": { "documentation": "Adjustments for increase (decrease) in repurchase agreements and cash collateral on securities lent to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Repurchase agreements and cash collateral on securities lent; Profit (loss)]" } } }, "auth_ref": [ "r362" ] }, "bmo_AdjustmentsForIncreaseDecreaseInTradingSecurities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForIncreaseDecreaseInTradingSecurities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 18.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Trading securities", "label": "Adjustments For Increase Decrease In Trading Securities", "documentation": "Adjustments for increase decrease in trading securities." } } }, "auth_ref": [] }, "bmo_AdjustmentsForNetGainLossOnSecuritiesOtherThanTrading": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForNetGainLossOnSecuritiesOtherThanTrading", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 14.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "verboseLabel": "Securities (gains), other than trading (Note 2)", "label": "Adjustments For Net Gain Loss On Securities Other Than Trading", "documentation": "Adjustments for net gain loss on securities other than trading." } } }, "auth_ref": [] }, "bmo_AdjustmentsForNetIncreaseDecreaseInOtherItemsAndAccrualsNet": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdjustmentsForNetIncreaseDecreaseInOtherItemsAndAccrualsNet", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 6.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Other items and accruals, net", "label": "Adjustments For Net Increase Decrease In Other Items And Accruals Net", "documentation": "Adjustments For Net Increase Decrease In Other Items And Accruals Net" } } }, "auth_ref": [] }, "ifrs-full_AdjustmentsForProvisions": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForProvisions", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Provision for credit losses (Note 3)", "label": "Adjustments for provisions" } } }, "auth_ref": [ "r361" ] }, "ifrs-full_AdjustmentsForReconcileProfitLossAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForReconcileProfitLossAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Adjustments to determine net cash flows provided by operating activities:", "label": "Adjustments to reconcile profit (loss) [abstract]" } } }, "auth_ref": [] }, "ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": -1.0, "order": 17.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Share of (profit) loss in associates and joint ventures", "label": "Adjustments for undistributed profits of investments accounted for using equity method" } } }, "auth_ref": [ "r362" ] }, "bmo_AdministrativeExpensesNetDefinedBenefitLiabilityAsset": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdministrativeExpensesNetDefinedBenefitLiabilityAsset", "crdr": "debit", "calculation": { "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails": { "parentTag": "bmo_PostemploymentBenefitExpense", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Administrative expenses", "label": "Administrative expenses, net defined benefit liability (asset)", "documentation": "Administrative expenses, net defined benefit liability (asset)" } } }, "auth_ref": [] }, "bmo_AdvertisingAndBusinessDevelopment": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AdvertisingAndBusinessDevelopment", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestExpense1", "weight": 1.0, "order": 6.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "verboseLabel": "Advertising and business development", "label": "Advertising And Business Development", "documentation": "Advertising and business development." } } }, "auth_ref": [] }, "bmo_AfterThirtyYearsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AfterThirtyYearsMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Ultimate", "label": "After Thirty Years [Member]", "documentation": "After thirty years." } } }, "auth_ref": [] }, "currency_AllCurrenciesDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/currency/2025", "localname": "AllCurrenciesDomain", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "All Currencies [Domain]", "label": "All Currencies [Domain]" } } }, "auth_ref": [] }, "bmo_AllOtherOperatingSegmentsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllOtherOperatingSegmentsMember", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "All Other Operating Segments", "label": "All Other Operating Segments [Member]", "documentation": "All Other Operating Segments [Member]" } } }, "auth_ref": [] }, "bmo_AllowanceAccountForCreditLossesOfLoans": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceAccountForCreditLossesOfLoans", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_LoansNetOfAllowanceForCreditLosses", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Allowance for credit losses (Note 3)", "label": "Allowance Account For Credit Losses Of Loans", "documentation": "The amount of an allowance account used to record impairments to loans." } } }, "auth_ref": [] }, "bmo_AllowanceAccountForCreditLossesOffBalanceSheet": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceAccountForCreditLossesOffBalanceSheet", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Allowances for credit losses off balance sheet", "label": "Allowance Account For Credit Losses Off Balance Sheet", "documentation": "The amount of an allowance account used to record impairments to off balance sheet due to credit losses." } } }, "auth_ref": [] }, "bmo_AllowanceForCreditLossesOfAmortizedCost": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceForCreditLossesOfAmortizedCost", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Allowance for credit losses of amortized cost", "label": "Allowance For Credit Losses Of Amortized cost", "documentation": "Allowance for credit losses of amortized cost." } } }, "auth_ref": [] }, "bmo_AllowanceForCreditLossesOfFvociSecurities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceForCreditLossesOfFvociSecurities", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Allowance for credit losses of FVOCI securities", "label": "Allowance For Credit Losses Of FVOCI Securities", "documentation": "Allowance for credit losses of FVOCI securities." } } }, "auth_ref": [] }, "bmo_AllowanceForCreditLossesOnFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceForCreditLossesOnFinancialAssets", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Allowances for credit losses", "periodStartLabel": "Balance as at beginning of period", "periodEndLabel": "Balance as at end of period", "terseLabel": "ACL", "label": "Allowance For Credit Losses On Financial Assets", "documentation": "Allowance for credit losses on financial assets." } } }, "auth_ref": [] }, "bmo_AllowanceForCreditLossesRelatedToLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceForCreditLossesRelatedToLoansMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Allowance for credit losses related to loans", "label": "Allowance for credit losses related to loans [Member]", "documentation": "Allowance for credit losses related to loans [Member]" } } }, "auth_ref": [] }, "bmo_AllowanceForCreditLossesRelatedToOtherCreditInstrumentsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceForCreditLossesRelatedToOtherCreditInstrumentsMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Allowance for credit losses related to other credit instruments", "label": "Allowance for credit losses related to other credit instruments [Member]", "documentation": "Allowance for credit losses related to other credit instruments [Member]" } } }, "auth_ref": [] }, "bmo_AllowanceForLoanLossesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceForLoanLossesMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Comprising: Loans", "label": "Allowance for loan losses [member]", "documentation": "Allowance for credit losses related to loans [member]" } } }, "auth_ref": [] }, "bmo_AllowanceForOtherCreditInstrumentsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AllowanceForOtherCreditInstrumentsMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other credit instruments", "label": "Allowance for Other credit instruments [member]", "documentation": "Allowance for credit losses related to other credit instruments [member]" } } }, "auth_ref": [] }, "dei_AmendmentFlag": { "xbrltype": "booleanItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "AmendmentFlag", "presentation": [ "http://www.bmo.com/role/CoverPage" ], "lang": { "en-us": { "role": { "terseLabel": "Amendment Flag", "label": "Amendment Flag", "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission." } } }, "auth_ref": [] }, "ifrs-full_AmortisationExpense": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AmortisationExpense", "crdr": "debit", "calculation": { "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails": { "parentTag": "ifrs-full_ProfitLossBeforeTax", "weight": -1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Depreciation and amortization", "label": "Amortisation expense" } } }, "auth_ref": [ "r376" ] }, "ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AmortisationIntangibleAssetsOtherThanGoodwill", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestExpense1", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "verboseLabel": "Amortization of intangible assets", "label": "Amortisation, intangible assets other than goodwill" } } }, "auth_ref": [ "r33", "r209" ] }, "bmo_AntiDilutiveEffectOfOrdinaryCommonSharesPotentiallyRepurchasedOnEarningPerShare": { "xbrltype": "sharesItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AntiDilutiveEffectOfOrdinaryCommonSharesPotentiallyRepurchasedOnEarningPerShare", "calculation": { "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails": { "parentTag": "ifrs-full_AdjustedWeightedAverageShares", "weight": -1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Common shares potentially repurchased (in shares)", "label": "Anti dilutive effect of ordinary common shares potentially repurchased on earning per share", "documentation": "Anti-dilutive effect of common shares potentially repurchased on diluted earnings per share calculation." } } }, "auth_ref": [] }, "bmo_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1": { "xbrltype": "sharesItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount1", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Outstanding options excluded from calculation of diluted earnings per share (in shares)", "label": "Antidilutive Securities Excluded from Computation of Earnings Per Share Amount1", "documentation": "Antidilutive securities excluded from computation of earnings per share amount1." } } }, "auth_ref": [] }, "ifrs-full_Assets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "Assets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Total Assets", "label": "Assets" } }, "en": { "role": { "documentation": "The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits." } } }, "auth_ref": [ "r71", "r72", "r78", "r157", "r160", "r241", "r242", "r270" ] }, "ifrs-full_AssetsAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AssetsAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Assets", "label": "Assets [abstract]" } } }, "auth_ref": [] }, "bmo_AssociationClearingAndAnnualRegulatorFee": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AssociationClearingAndAnnualRegulatorFee", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestExpense1", "weight": 1.0, "order": 8.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Association, clearing and annual regulator fees", "label": "Association Clearing And Annual Regulator Fee", "documentation": "Association clearing and annual regulator fee." } } }, "auth_ref": [] }, "bmo_AtCarryingValueMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AtCarryingValueMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Carrying value", "label": "At Carrying Value [Member]", "documentation": "At carrying value." } } }, "auth_ref": [] }, "ifrs-full_AtFairValueMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AtFairValueMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Fair value", "label": "At fair value [member]" } }, "en": { "role": { "documentation": "This member stands for measurement based on fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date." } } }, "auth_ref": [ "r36", "r40", "r61", "r71", "r214", "r240", "r241" ] }, "ifrs-full_AvailableforsaleFinancialAssetsAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "AvailableforsaleFinancialAssetsAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Items that will subsequently be reclassified to net income", "label": "Available-for-sale financial assets [abstract]" } } }, "auth_ref": [] }, "bmo_AverageAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AverageAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Average assets", "label": "Average assets", "documentation": "Average assets." } } }, "auth_ref": [] }, "bmo_AverageEarningAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "AverageEarningAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Average earning assets", "label": "Average Earning Assets", "documentation": "Average earning assets." } } }, "auth_ref": [] }, "bmo_BalancesOnDemandDepositsFromCustomersInterestBearing": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BalancesOnDemandDepositsFromCustomersInterestBearing", "crdr": "credit", "calculation": { "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails": { "parentTag": "bmo_Deposits1", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Interest bearing", "label": "Balances On Demand Deposits From Customers Interest Bearing", "documentation": "Balances on demand deposits from customers, interest bearing." } } }, "auth_ref": [] }, "bmo_BalancesOnDemandDepositsFromCustomersNoninterestBearing": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BalancesOnDemandDepositsFromCustomersNoninterestBearing", "crdr": "credit", "calculation": { "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails": { "parentTag": "bmo_Deposits1", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Non-interest bearing", "label": "Balances on demand deposits from customers, noninterest bearing", "documentation": "Balances on demand deposits from customers, noninterest bearing." } } }, "auth_ref": [] }, "bmo_BalancesOnNoticeDepositsFromCustomers": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BalancesOnNoticeDepositsFromCustomers", "crdr": "credit", "calculation": { "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails": { "parentTag": "bmo_Deposits1", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Payable after notice", "label": "Balances on notice deposits from customers", "documentation": "Balances on notice deposits from customers" } } }, "auth_ref": [] }, "ifrs-full_BalancesOnTermDepositsFromCustomers": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BalancesOnTermDepositsFromCustomers", "crdr": "credit", "calculation": { "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails": { "parentTag": "bmo_Deposits1", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Payable on a fixed date", "terseLabel": "Deposits booked payable on a fixed date", "label": "Balances on term deposits from customers" } }, "en": { "role": { "documentation": "The amount of balances in customers' term deposits held by the entity." } } }, "auth_ref": [ "r376" ] }, "ifrs-full_BankAcceptanceAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BankAcceptanceAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "verboseLabel": "Customers\u2019 liability under acceptances", "label": "Bank acceptance assets" } }, "en": { "role": { "documentation": "The amount of bank acceptances recognised as assets." } } }, "auth_ref": [ "r377" ] }, "ifrs-full_BankAcceptanceLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BankAcceptanceLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousLiabilities", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Acceptances", "label": "Bank acceptance liabilities" } }, "en": { "role": { "documentation": "The amount of bank acceptances recognised as liabilities." } } }, "auth_ref": [ "r377" ] }, "bmo_BankDepositsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BankDepositsMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Banks", "label": "Bank Deposits [Member]", "documentation": "Bank deposits." } } }, "auth_ref": [] }, "bmo_BankReCapitalizationBailinRegimeMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BankReCapitalizationBailinRegimeMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Bank Recapitalization (Bail-In) Regime", "label": "Bank Re capitalization Bailin Regime [Member]", "documentation": "Bank Re capitalization Bailin Regime" } } }, "auth_ref": [] }, "bmo_BankSecuritiesCarryingAmount": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BankSecuritiesCarryingAmount", "crdr": "debit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Total", "label": "Bank Securities Carrying Amount", "documentation": "Bank securities carrying amount." } } }, "auth_ref": [] }, "bmo_BaseCaseScenarioMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BaseCaseScenarioMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Base case scenario", "label": "Base Case Scenario [Member]", "documentation": "Base Case Scenario Member." } } }, "auth_ref": [] }, "bmo_BaseScenariosMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BaseScenariosMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Base", "label": "Base Scenarios [Member]", "documentation": "Base Scenario." } } }, "auth_ref": [] }, "ifrs-full_BasicEarningsLossPerShare": { "xbrltype": "perShareItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BasicEarningsLossPerShare", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Basic (in canadian dollars per share)", "verboseLabel": "Basic earnings per common share (in canadian dollars per share)", "label": "Basic earnings (loss) per share" } }, "en": { "role": { "documentation": "The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator)." } } }, "auth_ref": [ "r19", "r20" ] }, "ifrs-full_BasicEarningsPerShareAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BasicEarningsPerShareAbstract", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Basic Earnings Per Common Share", "label": "Basic earnings per share [abstract]" } } }, "auth_ref": [] }, "bmo_BmoCapitalMarketsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BmoCapitalMarketsMember", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Capital Markets", "label": "Bmo Capital Markets [Member]", "documentation": "Bmo Capital Markets [Member]" } } }, "auth_ref": [] }, "ifrs-full_BorrowingsAdjustmentToInterestRateBasis": { "xbrltype": "percentItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BorrowingsAdjustmentToInterestRateBasis", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Borrowings, adjustment to interest rate basis", "label": "Borrowings, adjustment to interest rate basis" } }, "en": { "role": { "documentation": "The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]" } } }, "auth_ref": [ "r365" ] }, "ifrs-full_BorrowingsInterestRate": { "xbrltype": "percentItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BorrowingsInterestRate", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Borrowings, interest rate", "label": "Borrowings, interest rate" } }, "en": { "role": { "documentation": "The interest rate on borrowings. [Refer: Borrowings]" } } }, "auth_ref": [ "r365" ] }, "bmo_BorrowingsPeriodicPrincipalPayment": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BorrowingsPeriodicPrincipalPayment", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Periodic payment, amount", "label": "Borrowings, Periodic Principal Payment", "documentation": "Borrowings, Periodic Principal Payment" } } }, "auth_ref": [] }, "bmo_BorrowingsPeriodicPrincipalPaymentPeriod": { "xbrltype": "durationItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BorrowingsPeriodicPrincipalPaymentPeriod", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Periodic payment, period", "label": "Borrowings, Periodic Principal Payment, Period", "documentation": "Borrowings, Periodic Principal Payment, Period" } } }, "auth_ref": [] }, "ifrs-full_BottomOfRangeMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BottomOfRangeMember", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails", "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Low", "label": "Bottom of range [member]" } }, "en": { "role": { "documentation": "This member stands for the bottom of a range." } } }, "auth_ref": [ "r49", "r82", "r100", "r114", "r186", "r308", "r310", "r365" ] }, "bmo_BurgundyAssetManagementLtd.Member": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BurgundyAssetManagementLtd.Member", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails", "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Burgundy Asset Management Ltd.", "label": "Burgundy Asset Management Ltd. [Member]", "documentation": "Burgundy Asset Management Ltd." } } }, "auth_ref": [] }, "bmo_BusinessAcquisitionMaximumAmountOfPaymentForContingentConsiderationPeriod": { "xbrltype": "durationItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BusinessAcquisitionMaximumAmountOfPaymentForContingentConsiderationPeriod", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Post-closing period for certain assets under management", "label": "Business Acquisition, Maximum Amount Of Payment For Contingent Consideration, Period", "documentation": "Business Acquisition, Maximum Amount Of Payment For Contingent Consideration, Period" } } }, "auth_ref": [] }, "bmo_BusinessAndGovernmentDepositsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BusinessAndGovernmentDepositsMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Business and government", "label": "Business And Government Deposits [Member]", "documentation": "Business And Government Deposits [Member]" } } }, "auth_ref": [] }, "bmo_BusinessAndGovernmentLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "BusinessAndGovernmentLoansMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Loans: Business and government", "verboseLabel": "Business and government", "netLabel": "Business and government loans", "label": "Business And Government Loans [Member]", "documentation": "business and government loans." } } }, "auth_ref": [] }, "ifrs-full_BusinessCombinationsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BusinessCombinationsAxis", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails", "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Business combinations [axis]", "label": "Business combinations [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r121", "r224" ] }, "ifrs-full_BusinessCombinationsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "BusinessCombinationsDomain", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails", "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Business combinations [domain]", "label": "Business combinations [domain]" } }, "en": { "role": { "documentation": "This member stands for the standard value for the 'Business combinations' axis if no other member is used." } } }, "auth_ref": [ "r121", "r124", "r224" ] }, "country_CA": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/country/2025", "localname": "CA", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Canada", "verboseLabel": "Canada", "label": "CANADA" } } }, "auth_ref": [] }, "bmo_CanadianFederalGovernmentMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CanadianFederalGovernmentMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Canadian federal government", "label": "Canadian federal government [member]", "documentation": "Canadian federal government." } } }, "auth_ref": [] }, "bmo_CanadianGovernmentProvinciaMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CanadianGovernmentProvinciaMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Canadian provincial and municipal governments", "label": "Canadian government provincia [member]", "documentation": "Canadian government provincial." } } }, "auth_ref": [] }, "bmo_CanadianPersonalAndCommercialBankingMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CanadianPersonalAndCommercialBankingMember", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Canadian P&C", "label": "Canadian Personal and Commercial Banking [Member]", "documentation": "Canadian personal and commercial banking." } } }, "auth_ref": [] }, "bmo_CanadianProvincialAndMunicipalGovernmentsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CanadianProvincialAndMunicipalGovernmentsMember", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Canadian provincial and municipal governments", "label": "Canadian Provincial And Municipal Governments [member]", "documentation": "Canadian provincial and municipal governments." } } }, "auth_ref": [] }, "bmo_CapitalConservationBufferPercentage": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CapitalConservationBufferPercentage", "presentation": [ "http://www.bmo.com/role/CapitalManagementAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Capital conservation buffer, percentage", "label": "Capital conservation buffer, percentage", "documentation": "Capital conservation buffer, percentage." } } }, "auth_ref": [] }, "bmo_CapitalRatio": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CapitalRatio", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total Capital Ratio", "label": "Capital ratio", "documentation": "Total capital dividend by Total capital risk-weighted assets." } } }, "auth_ref": [] }, "bmo_CapitalizationRateSignificantUnobservableInputAssets": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CapitalizationRateSignificantUnobservableInputAssets", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Capitalization rate", "label": "Capitalization Rate Significant Unobservable Input Assets", "documentation": "Capitalization rate significant unobservable input assets." } } }, "auth_ref": [] }, "ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]", "label": "Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r7", "r8", "r32", "r34", "r37", "r38", "r39", "r40", "r41", "r123", "r134", "r135", "r194", "r195", "r208", "r210", "r211", "r212", "r213", "r214", "r215", "r225", "r236", "r237" ] }, "ifrs-full_CarryingAmountMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CarryingAmountMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Carrying amount", "label": "Carrying amount [member]" } } }, "auth_ref": [ "r8", "r34", "r37", "r39", "r40", "r123", "r134", "r135", "r195", "r210", "r211", "r213", "r214", "r225", "r236", "r237" ] }, "ifrs-full_CashAndCashEquivalents": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashAndCashEquivalents", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Assets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Cash and Cash Equivalents", "periodStartLabel": "Cash and Cash Equivalents at Beginning of Period", "periodEndLabel": "Cash and Cash Equivalents at End of Period", "label": "Cash and cash equivalents" } }, "en": { "role": { "documentation": "The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]" } } }, "auth_ref": [ "r50", "r66", "r187", "r265" ] }, "ifrs-full_CashAndCashEquivalentsInSubsidiaryOrBusinessesAcquiredOrDisposed2013": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashAndCashEquivalentsInSubsidiaryOrBusinessesAcquiredOrDisposed2013", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlowsParenthetical" ], "lang": { "en-us": { "role": { "terseLabel": "Cash and cash equivalents acquired as part of the acquisitions", "label": "Cash and cash equivalents in subsidiary or businesses acquired or disposed" } }, "en": { "role": { "documentation": "The amount of cash and cash equivalents in subsidiaries or other businesses over which control is obtained or lost. [Refer: Total for all subsidiaries [member]; Cash and cash equivalents]" } } }, "auth_ref": [ "r48" ] }, "ifrs-full_CashFlowHedgesAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowHedgesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Net change in unrealized gains (losses) on derivatives designated as cash flow hedges", "label": "Cash flow hedges [abstract]" } } }, "auth_ref": [] }, "ifrs-full_CashFlowsFromUsedInDecreaseIncreaseInShorttermDepositsAndInvestments": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowsFromUsedInDecreaseIncreaseInShorttermDepositsAndInvestments", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Interest bearing deposits with banks", "label": "Cash flows from (used in) decrease (increase) in short-term deposits and investments" } }, "en": { "role": { "documentation": "The cash inflow (outflow) due to a decrease (increase) in short-term deposits and investments." } } }, "auth_ref": [ "r359" ] }, "ifrs-full_CashFlowsFromUsedInFinancingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowsFromUsedInFinancingActivities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "totalLabel": "Net Cash Provided by (Used in) Financing Activities", "label": "Cash flows from (used in) financing activities" } }, "en": { "role": { "documentation": "The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity, from continuing and discontinued operations." } } }, "auth_ref": [ "r42", "r51" ] }, "ifrs-full_CashFlowsFromUsedInFinancingActivitiesAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowsFromUsedInFinancingActivitiesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Cash Flows Provided by (Used in) Financing Activities", "label": "Cash flows from (used in) financing activities [abstract]" } } }, "auth_ref": [] }, "ifrs-full_CashFlowsFromUsedInInvestingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowsFromUsedInInvestingActivities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "totalLabel": "Net Cash Provided by (Used in) Investing Activities", "label": "Cash flows from (used in) investing activities" } }, "en": { "role": { "documentation": "The cash flows from (used in) investing activities, which are the acquisition and disposal of long-term assets and other investments not included in cash equivalents, from continuing and discontinued operations." } } }, "auth_ref": [ "r42", "r51" ] }, "ifrs-full_CashFlowsFromUsedInInvestingActivitiesAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowsFromUsedInInvestingActivitiesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Cash Flows Provided by (Used in) Investing Activities", "label": "Cash flows from (used in) investing activities [abstract]" } } }, "auth_ref": [] }, "ifrs-full_CashFlowsFromUsedInOperatingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowsFromUsedInOperatingActivities", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "totalLabel": "Net Cash Provided by (Used in) Operating Activities", "label": "Cash flows from (used in) operating activities" } } }, "auth_ref": [ "r42", "r51" ] }, "ifrs-full_CashFlowsFromUsedInOperatingActivitiesAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowsFromUsedInOperatingActivitiesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Cash Flows Provided by (Used in) Operating Activities", "label": "Cash flows from (used in) operating activities [abstract]" } } }, "auth_ref": [] }, "ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities", "weight": -1.0, "order": 6.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Acquisition (Note 13)", "label": "Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities" } }, "en": { "role": { "documentation": "The aggregate cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities. [Refer: Total for all subsidiaries [member]]" } } }, "auth_ref": [ "r47" ] }, "ifrs-full_CashTransferred": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CashTransferred", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Cash transferred", "label": "Cash transferred" } }, "en": { "role": { "documentation": "The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Total for all business combinations [member]]" } } }, "auth_ref": [ "r117", "r220" ] }, "ifrs-full_CategoriesOfFinancialAssetsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CategoriesOfFinancialAssetsAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails", "http://www.bmo.com/role/SecuritiesSummaryofInterestIncomeCalculatedUsingEffectiveInterestMethodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Categories of financial assets [axis]", "label": "Categories of financial assets [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r147", "r231" ] }, "ifrs-full_CategoriesOfFinancialAssetsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CategoriesOfFinancialAssetsDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails", "http://www.bmo.com/role/SecuritiesSummaryofInterestIncomeCalculatedUsingEffectiveInterestMethodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Categories of financial assets [domain]", "label": "Categories of financial assets [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregated categories of financial assets. It also represents the standard value for the 'Categories of financial assets' axis if no other member is used. [Refer: Financial assets]" } } }, "auth_ref": [ "r147", "r231" ] }, "ifrs-full_CategoriesOfFinancialLiabilitiesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CategoriesOfFinancialLiabilitiesAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Categories of financial liabilities [axis]", "label": "Categories of financial liabilities [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r147", "r231" ] }, "ifrs-full_CategoriesOfFinancialLiabilitiesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CategoriesOfFinancialLiabilitiesDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Categories of financial liabilities [domain]", "label": "Categories of financial liabilities [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregated categories of financial liabilities. It also represents the standard value for the 'Categories of financial liabilities' axis if no other member is used. [Refer: Financial assets]" } } }, "auth_ref": [ "r147", "r231" ] }, "bmo_ChangesInOperatingAssetsAndLiabilitiesAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ChangesInOperatingAssetsAndLiabilitiesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Changes in operating assets and liabilities:", "label": "Changes in operating assets and liabilities [Abstract]", "documentation": "Changes in operating assets and liabilities." } } }, "auth_ref": [] }, "ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CharacteristicsOfDefinedBenefitPlansAxis", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Characteristics of defined benefit plans [axis]", "label": "Characteristics of defined benefit plans [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r299" ] }, "ifrs-full_CharacteristicsOfDefinedBenefitPlansDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CharacteristicsOfDefinedBenefitPlansDomain", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Characteristics of defined benefit plans [domain]", "label": "Characteristics of defined benefit plans [domain]" } }, "en": { "role": { "documentation": "This member stands for all defined benefit plans when disaggregated by characteristics of defined benefits plans. It also represents the standard value for the 'Characteristics of defined benefit plans' axis if no other member is used." } } }, "auth_ref": [ "r299" ] }, "bmo_ClassBSeriesFiftyPreferredSharesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ClassBSeriesFiftyPreferredSharesMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Class B \u2013 Series 50", "label": "Class B Series Fifty Preferred Shares [Member]", "documentation": "Class b series fifty preferred shares." } } }, "auth_ref": [] }, "bmo_ClassBSeriesFiftyTwoPreferredSharesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ClassBSeriesFiftyTwoPreferredSharesMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Class B \u2013 Series 52", "label": "Class B series Fifty Two Preferred Shares [Member]", "documentation": "Class b series fifty two preferred shares." } } }, "auth_ref": [] }, "bmo_ClassBSeriesFortyEightPreferredSharesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ClassBSeriesFortyEightPreferredSharesMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Class B - Series 48", "label": "Class B Series Forty Eight Preferred Shares [Member]", "documentation": "Class B Series Forty Eight Preferred Shares" } } }, "auth_ref": [] }, "bmo_ClassBSeriesFortyFourPreferredSharesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ClassBSeriesFortyFourPreferredSharesMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Class B \u2013 Series 44", "label": "Class B Series Forty Four Preferred Shares [Member]", "documentation": "Class B Series Forty Four Preferred Shares." } } }, "auth_ref": [] }, "ifrs-full_ClassesOfAssetsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfAssetsAxis", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical", "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of assets [axis]", "label": "Classes of assets [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r25", "r26", "r80", "r85", "r176", "r203", "r245" ] }, "ifrs-full_ClassesOfAssetsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfAssetsDomain", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical", "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of assets [domain]", "label": "Classes of assets [domain]" } }, "en": { "role": { "documentation": "This member stands for a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits. It also represents the standard value for the 'Classes of assets' axis if no other member is used." } } }, "auth_ref": [ "r25", "r80", "r85", "r176", "r203", "r245" ] }, "ifrs-full_ClassesOfFinancialAssetsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfFinancialAssetsAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of financial assets [axis]", "label": "Classes of financial assets [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r109", "r140", "r141", "r170", "r171", "r253" ] }, "ifrs-full_ClassesOfFinancialAssetsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfFinancialAssetsDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of financial assets [domain]", "label": "Classes of financial assets [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregated classes of financial assets. It also represents the standard value for the 'Classes of financial assets' axis if no other member is used. [Refer: Financial assets]" } } }, "auth_ref": [ "r109", "r140", "r141", "r170", "r171", "r253" ] }, "ifrs-full_ClassesOfFinancialInstrumentsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfFinancialInstrumentsAxis", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of financial instruments [axis]", "label": "Classes of financial instruments [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r134", "r136", "r137", "r138", "r236", "r238" ] }, "ifrs-full_ClassesOfFinancialInstrumentsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfFinancialInstrumentsDomain", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of financial instruments [domain]", "label": "Classes of financial instruments [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregated classes of financial instruments. Financial instruments are contracts that give rise to a financial asset of one entity and a financial liability or equity instrument of another entity. It also represents the standard value for the 'Classes of financial instruments' axis if no other member is used. [Refer: Financial assets; Financial liabilities]" } } }, "auth_ref": [ "r134", "r136", "r137", "r138", "r236", "r238" ] }, "ifrs-full_ClassesOfFinancialLiabilitiesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfFinancialLiabilitiesAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of financial liabilities [axis]", "label": "Classes of financial liabilities [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r140", "r141", "r170", "r171" ] }, "ifrs-full_ClassesOfFinancialLiabilitiesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfFinancialLiabilitiesDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of financial liabilities [domain]", "label": "Classes of financial liabilities [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregated classes financial liabilities. It also represents the standard value for the 'Classes of financial liabilities' axis if no other member is used. [Refer: Financial liabilities]" } } }, "auth_ref": [ "r140", "r141", "r170", "r171" ] }, "ifrs-full_ClassesOfLiabilitiesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfLiabilitiesAxis", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of liabilities [axis]", "label": "Classes of liabilities [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r80", "r245" ] }, "ifrs-full_ClassesOfLiabilitiesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfLiabilitiesDomain", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of liabilities [domain]", "label": "Classes of liabilities [domain]" } }, "en": { "role": { "documentation": "This member stands for a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits. It also represents the standard value for the 'Classes of liabilities' axis if no other member is used. [Refer: Liabilities]" } } }, "auth_ref": [ "r80", "r245" ] }, "ifrs-full_ClassesOfShareCapitalAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfShareCapitalAxis", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/EquityAdditionalInformationDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of share capital [axis]", "label": "Classes of share capital [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r184", "r247", "r278" ] }, "ifrs-full_ClassesOfShareCapitalDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassesOfShareCapitalDomain", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/EquityAdditionalInformationDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classes of share capital [domain]", "label": "Classes of share capital [domain]" } }, "en": { "role": { "documentation": "This member stands for share capital of the entity. It also represents the standard value for the 'Classes of share capital' axis if no other member is used." } } }, "auth_ref": [ "r184", "r247", "r278" ] }, "ifrs-full_ClassificationOfAssetsAsHeldForSaleMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ClassificationOfAssetsAsHeldForSaleMember", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Classification of assets as held for sale", "label": "Classification of assets as held for sale [member]" } }, "en": { "role": { "documentation": "This member stands for classification of assets as held for sale. [Refer: Non-current assets held for sale [member]]" } } }, "auth_ref": [ "r297", "r341" ] }, "bmo_CommodityContractsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CommodityContractsMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Commodity contracts", "label": "Commodity Contracts [member]", "documentation": "Commodity contracts." } } }, "auth_ref": [] }, "bmo_CommonEquitySurchargePercentage": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CommonEquitySurchargePercentage", "presentation": [ "http://www.bmo.com/role/CapitalManagementAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Common equity surcharge, percentage", "label": "Common equity surcharge, percentage", "documentation": "Common equity surcharge, percentage." } } }, "auth_ref": [] }, "bmo_CommonEquityTierOneCapitalAmount": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CommonEquityTierOneCapitalAmount", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "CET1 Capital", "label": "Common equity tier one capital amount", "documentation": "Common equity tier one capital amount" } } }, "auth_ref": [] }, "bmo_CommonEquityTierOneCapitalRatio1": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CommonEquityTierOneCapitalRatio1", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "CET1 Ratio", "label": "Common equity tier one capital ratio1", "documentation": "Common shareholder's equity, net of capital adjustments, divided by Common Equity Tier 1 capital risk-weighted assets." } } }, "auth_ref": [] }, "bmo_CommonEquityTierOneCapitalRatioRiskWeightedAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CommonEquityTierOneCapitalRatioRiskWeightedAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Risk-Weighted Assets", "label": "Common equity tier one capital ratio risk weighted assets", "documentation": "Common equity tier one capital ratio risk weighted assets" } } }, "auth_ref": [] }, "bmo_CommonStockConversionPrice": { "xbrltype": "perShareItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CommonStockConversionPrice", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Common stock conversion price", "label": "Common Stock Conversion Price", "documentation": "Common stock price conversion per share." } } }, "auth_ref": [] }, "ifrs-full_CommunicationExpense": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CommunicationExpense", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestExpense1", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Communications", "label": "Communication expense" } } }, "auth_ref": [ "r376" ] }, "bmo_ComponentOfLoanReceivableAxis": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ComponentOfLoanReceivableAxis", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Component Of Loan Receivable [Axis]", "label": "Component Of Loan Receivable [Axis]", "documentation": "Component Of Loan Receivable [Axis]" } } }, "auth_ref": [] }, "bmo_ComponentOfLoanReceivableDomain": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ComponentOfLoanReceivableDomain", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Component Of Loan Receivable [Domain]", "label": "Component Of Loan Receivable [Domain]", "documentation": "Component Of Loan Receivable [Domain]" } } }, "auth_ref": [] }, "ifrs-full_ComponentsOfEquityAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ComponentsOfEquityAxis", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Components of equity [axis]", "label": "Components of equity [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r260" ] }, "ifrs-full_ComponentsOfEquityDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ComponentsOfEquityDomain", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Components of equity [domain]", "label": "Components of equity [domain]" } }, "en": { "role": { "documentation": "This member stands for the residual interest in the assets of the entity after deducting all its liabilities. It also represents the standard value for the 'Components of equity' axis if no other member is used." } } }, "auth_ref": [ "r260" ] }, "ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Net change in unrealized gains (losses) on fair value through OCI debt securities", "label": "Components of other comprehensive income that will be reclassified to profit or loss, net of tax [abstract]" } } }, "auth_ref": [] }, "ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Items that will not be subsequently reclassified to net income", "label": "Components of other comprehensive income that will not be reclassified to profit or loss, net of tax [abstract]" } } }, "auth_ref": [] }, "bmo_CompoundInstrumentInterestRate": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CompoundInstrumentInterestRate", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Compound instrument interest rate", "label": "Compound Instrument Interest Rate", "documentation": "Compound Instrument Interest Rate" } } }, "auth_ref": [] }, "ifrs-full_ComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ComprehensiveIncome", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": null, "weight": null, "order": null, "root": true }, "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeAlternativeCalcuations": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Total Comprehensive Income", "label": "Comprehensive income" } }, "en": { "role": { "documentation": "The amount of change in equity resulting from transactions and other events, other than those changes resulting from transactions with owners in their capacity as owners." } } }, "auth_ref": [ "r54", "r56", "r63", "r201", "r217", "r255", "r282", "r306" ] }, "ifrs-full_ComprehensiveIncomeAttributableToAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ComprehensiveIncomeAttributableToAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Attributable to:", "label": "Comprehensive income attributable to [abstract]" } } }, "auth_ref": [] }, "ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ComprehensiveIncomeAttributableToNoncontrollingInterests", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeAlternativeCalcuations": { "parentTag": "ifrs-full_ComprehensiveIncome", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Non-controlling interest in subsidiaries", "label": "Comprehensive income, attributable to non-controlling interests" } }, "en": { "role": { "documentation": "The amount of comprehensive income attributable to non-controlling interests. [Refer: Comprehensive income; Non-controlling interests]" } } }, "auth_ref": [ "r255", "r285" ] }, "ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ComprehensiveIncomeAttributableToOwnersOfParent", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeAlternativeCalcuations": { "parentTag": "ifrs-full_ComprehensiveIncome", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Bank shareholders", "label": "Comprehensive income, attributable to owners of parent" } }, "en": { "role": { "documentation": "The amount of comprehensive income attributable to owners of the parent. [Refer: Comprehensive income]" } } }, "auth_ref": [ "r255", "r286" ] }, "bmo_ConsumerInstallmentAndOtherPersonalLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ConsumerInstallmentAndOtherPersonalLoansMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Loans: Consumer instalment and other personal", "label": "Consumer installment and other personal loans [member]", "documentation": "Consumer installment and other personal loans." } } }, "auth_ref": [] }, "ifrs-full_ConsumerLoans": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ConsumerLoans", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_LoansBeforeAllowanceForLoanLosses", "weight": 1.0, "order": 2.0 }, "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails": { "parentTag": "bmo_LoansNetOfAllowanceForLoanLosses", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Consumer instalment and other personal", "label": "Loans to consumers" } }, "en": { "role": { "documentation": "The amount of consumer loans made by the entity. [Refer: Loans to consumers [member]]" } } }, "auth_ref": [ "r376" ] }, "ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ContingentConsiderationRecognisedAsOfAcquisitionDate", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Contingent consideration recognised as of acquisition date", "label": "Contingent consideration recognised as of acquisition date" } }, "en": { "role": { "documentation": "The amount, at acquisition date, of contingent consideration arrangements recognised as consideration transferred in a business combination. [Refer: Total for all business combinations [member]]" } } }, "auth_ref": [ "r120", "r223" ] }, "ifrs-full_ContingentLiabilitiesRecognisedInBusinessCombination": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ContingentLiabilitiesRecognisedInBusinessCombination", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Adjusted contingent consideration", "label": "Contingent liabilities recognised in business combination" } }, "en": { "role": { "documentation": "The amount of contingent liabilities recognised in a business combination. [Refer: Classes of contingent liabilities [domain]; Total for all business combinations [member]]" } } }, "auth_ref": [ "r122" ] }, "ifrs-full_ContractualServiceMargin": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ContractualServiceMargin", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Contractual service margin", "label": "Contractual service margin" } }, "en": { "role": { "documentation": "The amount of the contractual service margin. [Refer: Contractual service margin [member]]" } } }, "auth_ref": [ "r98" ] }, "bmo_ContractualServiceMarginFromContracts": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ContractualServiceMarginFromContracts", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Contractual service margin", "label": "Contractual Service Margin From Contracts", "documentation": "Contractual service margin from contracts." } } }, "auth_ref": [] }, "bmo_CorporateBbbTenYearSpread": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CorporateBbbTenYearSpread", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Corporate BBB 10-year spread", "label": "Corporate BBB ten year spread", "documentation": "Corporate BBB ten year spread." } } }, "auth_ref": [] }, "bmo_CorporateDebtMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CorporateDebtMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Corporate debt", "label": "Corporate Debt [member]", "documentation": "Corporate debt." } } }, "auth_ref": [] }, "bmo_CorporateEquityMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CorporateEquityMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Corporate equity", "label": "Corporate equity [member]", "documentation": "Corporate equity." } } }, "auth_ref": [] }, "bmo_CorporateServicesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CorporateServicesMember", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Corporate Services", "label": "Corporate services [member]", "documentation": "Corporate services." } } }, "auth_ref": [] }, "ifrs-full_CounterpartiesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CounterpartiesAxis", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Counterparties [axis]", "label": "Counterparties [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r151" ] }, "ifrs-full_CounterpartiesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CounterpartiesDomain", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Counterparties [domain]", "label": "Counterparties [domain]" } }, "en": { "role": { "documentation": "This member stands for the parties to the transaction other than the entity. It also represents the standard value for the 'Counterparties' axis if no other member is used." } } }, "auth_ref": [ "r151" ] }, "dei_CoverAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "CoverAbstract", "lang": { "en-us": { "role": { "label": "Cover [Abstract]", "documentation": "Cover page." } } }, "auth_ref": [] }, "bmo_CreditCardConsumerInstallmentAndOtherPersonalLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CreditCardConsumerInstallmentAndOtherPersonalLoansMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Credit cards, consumer instalment and other personal", "label": "Credit card, consumer installment and other personal loans [member]", "documentation": "Credit card, consumer installment and other personal loans." } } }, "auth_ref": [] }, "bmo_CreditCardFeeIncome": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CreditCardFeeIncome", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Card fees", "label": "Credit card fee income", "documentation": "Income on credit card fees." } } }, "auth_ref": [] }, "ifrs-full_CreditCardLoans": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CreditCardLoans", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_LoansBeforeAllowanceForLoanLosses", "weight": 1.0, "order": 3.0 }, "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails": { "parentTag": "bmo_LoansNetOfAllowanceForLoanLosses", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Credit cards", "label": "Credit card loans" } }, "en": { "role": { "documentation": "The amount of credit card loans made by the entity." } } }, "auth_ref": [ "r377" ] }, "bmo_CreditCardLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CreditCardLoansMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Loans: Credit cards", "label": "Credit Card Loans [Member]", "documentation": "Credit card loans." } } }, "auth_ref": [] }, "bmo_CreditDefaultSwapsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "CreditDefaultSwapsMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Credit default swaps", "label": "Credit default swaps [member]", "documentation": "Credit default swaps." } } }, "auth_ref": [] }, "ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CreditImpairmentOfFinancialInstrumentsAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Credit impairment of financial instruments [axis]", "label": "Credit impairment of financial instruments [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r134", "r137", "r236", "r238" ] }, "ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CreditImpairmentOfFinancialInstrumentsDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Credit impairment of financial instruments [domain]", "label": "Credit impairment of financial instruments [domain]" } }, "en": { "role": { "documentation": "This member stands for all statuses of credit impairment of financial instruments. A financial instrument is credit-impaired when one or more events that have a detrimental impact on the estimated future cash flows of that financial instrument have occurred. This member also represents the standard value for the 'Credit impairment of financial instruments' axis if no other member is used." } } }, "auth_ref": [ "r134", "r137", "r236", "r238" ] }, "srt_CurrencyAxis": { "xbrltype": "stringItemType", "nsuri": "http://fasb.org/srt/2025", "localname": "CurrencyAxis", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Currency [Axis]", "label": "Currency [Axis]" } } }, "auth_ref": [] }, "dei_CurrentFiscalYearEndDate": { "xbrltype": "gMonthDayItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "CurrentFiscalYearEndDate", "presentation": [ "http://www.bmo.com/role/CoverPage" ], "lang": { "en-us": { "role": { "terseLabel": "Current Fiscal Year End Date", "label": "Current Fiscal Year End Date", "documentation": "End date of current fiscal year in the format --MM-DD." } } }, "auth_ref": [] }, "ifrs-full_CurrentServiceCostDefinedBenefitPlans": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CurrentServiceCostDefinedBenefitPlans", "crdr": "debit", "calculation": { "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails": { "parentTag": "bmo_PostemploymentBenefitExpense", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Current service cost", "label": "Current service cost, defined benefit plans" } } }, "auth_ref": [ "r355" ] }, "ifrs-full_CurrentTaxAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "CurrentTaxAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 6.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Current tax assets", "label": "Current tax assets" } }, "en": { "role": { "documentation": "The excess of amount paid for current tax in respect of current and prior periods over the amount due for those periods. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period." } } }, "auth_ref": [ "r266" ] }, "bmo_DebenturesSeries20Member": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DebenturesSeries20Member", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Debentures Series 20", "label": "Debentures Series 20 [Member]", "documentation": "Debentures Series 20" } } }, "auth_ref": [] }, "bmo_DebtInstrument1Axis": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DebtInstrument1Axis", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Debt Instrument [Axis]", "label": "Debt Instrument 1 [Axis]", "documentation": "Debt instrument 1." } } }, "auth_ref": [] }, "bmo_DebtInstrument1Domain": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DebtInstrument1Domain", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Debt Instrument [Domain]", "label": "Debt Instrument 1 [Domain]", "documentation": "Debt Instrument 1 [Domain]" } } }, "auth_ref": [] }, "ifrs-full_DebtSecuritiesMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DebtSecuritiesMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Debt securities", "label": "Debt securities [member]" } }, "en": { "role": { "documentation": "This member stands for instruments held by the entity that represent indebtedness." } } }, "auth_ref": [ "r307", "r309" ] }, "bmo_DecreaseInProfitOrLossFromFiftyBasisPointDecreaseInInterestRates": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DecreaseInProfitOrLossFromFiftyBasisPointDecreaseInInterestRates", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/InsuranceSensitivityAnalysisDetails" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "50 basis point decrease", "label": "Decrease In Profit Or Loss From Fifty Basis Point Decrease In Interest Rates", "documentation": "Decrease In Profit Or Loss From Fifty Basis Point Decrease In Interest Rates" } } }, "auth_ref": [] }, "bmo_DecreaseInProfitOrLossFromTenPercentDecreaseInEquityPrices": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DecreaseInProfitOrLossFromTenPercentDecreaseInEquityPrices", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/InsuranceSensitivityAnalysisDetails" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "10% decrease", "label": "Decrease In Profit Or Loss From Ten Percent Decrease In Equity Prices", "documentation": "Decrease In Profit Or Loss From Ten Percent Decrease In Equity Prices" } } }, "auth_ref": [] }, "ifrs-full_DecreaseThroughWriteoffFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DecreaseThroughWriteoffFinancialAssets", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Write-offs", "label": "Decrease through write-off, financial assets" } }, "en": { "role": { "documentation": "The decrease in financial assets resulting from write-off. [Refer: Financial assets]" } } }, "auth_ref": [ "r320", "r321", "r331", "r344", "r345" ] }, "bmo_DefaultAndImpairedMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DefaultAndImpairedMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Impaired", "label": "Default And Impaired [Member]", "documentation": "Default and impaired." } } }, "auth_ref": [] }, "ifrs-full_DeferredTaxAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DeferredTaxAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 7.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Deferred tax assets", "label": "Deferred tax assets" } }, "en": { "role": { "documentation": "The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]" } } }, "auth_ref": [ "r5", "r193", "r267", "r271" ] }, "ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate", "crdr": "credit", "calculation": { "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails": { "parentTag": "bmo_LiabilitiesRecognisedAsOfAcquisitionDate", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Deferred tax liabilities", "label": "Deferred tax liabilities recognised as of acquisition date" } }, "en": { "role": { "documentation": "The amount recognised as of the acquisition date for deferred tax liabilities assumed in a business combination. [Refer: Deferred tax liabilities; Total for all business combinations [member]]" } } }, "auth_ref": [ "r364" ] }, "ifrs-full_DefinedBenefitPlansAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DefinedBenefitPlansAxis", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Defined benefit plans [axis]", "label": "Defined benefit plans [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r9", "r197" ] }, "ifrs-full_DefinedBenefitPlansDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DefinedBenefitPlansDomain", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Defined benefit plans [domain]", "label": "Defined benefit plans [domain]" } }, "en": { "role": { "documentation": "This member stands for post-employment benefit plans other than defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. It also represents the standard value for the 'Defined benefit plans' axis if no other member is used." } } }, "auth_ref": [ "r9", "r197" ] }, "bmo_DefinedBenefitPlansImpactOfPlanAmendmentsExpenses": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DefinedBenefitPlansImpactOfPlanAmendmentsExpenses", "crdr": "credit", "calculation": { "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails": { "parentTag": "bmo_PostemploymentBenefitExpense", "weight": -1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Impact of plan amendments", "label": "Defined Benefit Plans Impact of Plan Amendments Expenses", "documentation": "Impact of plan amendments." } } }, "auth_ref": [] }, "bmo_DepositAndPaymentServiceChargesRevenue": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DepositAndPaymentServiceChargesRevenue", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Deposit and payment service charges", "label": "Deposit and payment service charges revenue", "documentation": "Deposit and payment service charges revenue." } } }, "auth_ref": [] }, "ifrs-full_DepositLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DepositLiabilities", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Deposits liabilities", "label": "Deposit liabilities" } }, "en": { "role": { "documentation": "The amount of deposit liabilities held by the entity." } } }, "auth_ref": [ "r377" ] }, "bmo_Deposits1": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "Deposits1", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Liabilities", "weight": 1.0, "order": 1.0 }, "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits (Note 4)", "totalLabel": "Deposits", "verboseLabel": "Deposits", "label": "Deposits1", "documentation": "The amount of deposit liabilities held by the entity." } } }, "auth_ref": [] }, "bmo_DepositsAmortizedCostMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DepositsAmortizedCostMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total amortized cost deposits", "label": "Deposits Amortized Cost [Member]", "documentation": "Deposits Amortized Cost [Member]" } } }, "auth_ref": [] }, "bmo_DepositsAtFairValue": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DepositsAtFairValue", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits", "label": "Deposits At Fair Value", "documentation": "Deposits at fair value." } } }, "auth_ref": [] }, "bmo_DepositsAtFairValueThroughProfitAndLossMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DepositsAtFairValueThroughProfitAndLossMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits at FVTPL", "label": "Deposits At Fair Value Through Profit And Loss [Member]", "documentation": "Deposits At Fair Value Through Profit And Loss [Member]" } } }, "auth_ref": [] }, "bmo_DepositsHeldForSale": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DepositsHeldForSale", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits held for sale", "label": "Deposits Held For Sale", "documentation": "Deposits Held For Sale" } } }, "auth_ref": [] }, "bmo_DepositsMoreThanOneHundredThousandDollarMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DepositsMoreThanOneHundredThousandDollarMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits More Than One Hundred Thousand Dollar", "label": "Deposits More Than One Hundred Thousand Dollar [Member]", "documentation": "Deposits More Than One Hundred Thousand Dollar [Member]" } } }, "auth_ref": [] }, "bmo_DerecognitionsAndMaturitiesAllowanceAccountForCreditLossesOfFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DerecognitionsAndMaturitiesAllowanceAccountForCreditLossesOfFinancialAssets", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Derecognitions and maturities", "label": "Derecognitions and maturities allowance account for credit losses of financial assets", "documentation": "Derecognitions and maturities allowance account for credit losses of financial assets." } } }, "auth_ref": [] }, "bmo_DerivativeAssets1Abstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DerivativeAssets1Abstract", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Derivative Assets", "label": "Derivative Assets 1 [abstract]", "documentation": "Derivative assets 1." } } }, "auth_ref": [] }, "ifrs-full_DerivativeFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DerivativeFinancialAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Derivative instruments", "verboseLabel": "Derivative Assets", "label": "Derivative financial assets" } }, "en": { "role": { "documentation": "The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]" } } }, "auth_ref": [ "r377" ] }, "ifrs-full_DerivativeFinancialLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DerivativeFinancialLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousLiabilities", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Derivative instruments", "verboseLabel": "Derivative Liabilities", "label": "Derivative financial liabilities" } }, "en": { "role": { "documentation": "The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]" } } }, "auth_ref": [ "r377" ] }, "bmo_DerivativeLiabilities1Abstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DerivativeLiabilities1Abstract", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Derivative Liabilities", "label": "Derivative Liabilities 1 [abstract]", "documentation": "Derivative liabilities 1." } } }, "auth_ref": [] }, "bmo_DerivativesAssetMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DerivativesAssetMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Derivative Assets", "label": "Derivatives Asset [Member]", "documentation": "Derivatives Asset [Member]" } } }, "auth_ref": [] }, "bmo_DerivativesLiabilitiesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DerivativesLiabilitiesMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Derivative Liabilities", "label": "Derivatives Liabilities [member]", "documentation": "Derivatives liabilities." } } }, "auth_ref": [] }, "ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted": { "xbrltype": "percentItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DescriptionOfExpectedVolatilityShareOptionsGranted", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Expected share price volatility", "label": "Expected volatility, share options granted" } }, "en": { "role": { "documentation": "The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time." } } }, "auth_ref": [ "r115" ] }, "ifrs-full_DescriptionOfOptionLifeShareOptionsGranted": { "xbrltype": "decimalItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DescriptionOfOptionLifeShareOptionsGranted", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Expected period until exercise (in years)", "label": "Option life, share options granted" } }, "en": { "role": { "documentation": "The option life of share options granted." } } }, "auth_ref": [ "r115" ] }, "ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted": { "xbrltype": "percentItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DescriptionOfRiskFreeInterestRateShareOptionsGranted", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Risk-free rate of return", "label": "Risk free interest rate, share options granted" } }, "en": { "role": { "documentation": "The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]" } } }, "auth_ref": [ "r115" ] }, "ifrs-full_DilutedEarningsLossPerShare": { "xbrltype": "perShareItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DilutedEarningsLossPerShare", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Diluted (in canadian dollars per share)", "verboseLabel": "Diluted earnings per common share (in canadian dollars per share)", "label": "Diluted earnings (loss) per share" } }, "en": { "role": { "documentation": "The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]" } } }, "auth_ref": [ "r19", "r20" ] }, "ifrs-full_DilutedEarningsPerShareAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DilutedEarningsPerShareAbstract", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Diluted Earnings Per Common Share", "label": "Diluted earnings per share [abstract]" } } }, "auth_ref": [] }, "ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares": { "xbrltype": "sharesItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares", "calculation": { "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails": { "parentTag": "ifrs-full_AdjustedWeightedAverageShares", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Stock options potentially exercisable (in shares)", "label": "Dilutive effect of share options on weighted average number of ordinary shares" } }, "en": { "role": { "documentation": "The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options." } } }, "auth_ref": [ "r357" ] }, "bmo_DilutivePotentialSharesFromStockOptionsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DilutivePotentialSharesFromStockOptionsMember", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Dilutive potential shares from stock options", "label": "Dilutive potential shares from stock options [Member]", "documentation": "Dilutive potential shares from stock options [Member]" } } }, "auth_ref": [] }, "ifrs-full_DisaggregationOfInsuranceContractsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisaggregationOfInsuranceContractsAxis", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disaggregation of insurance contracts [axis]", "label": "Disaggregation of insurance contracts [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r97", "r98", "r103", "r104", "r107" ] }, "ifrs-full_DisaggregationOfInsuranceContractsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisaggregationOfInsuranceContractsDomain", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disaggregation of insurance contracts [domain]", "label": "Disaggregation of insurance contracts [domain]" } }, "en": { "role": { "documentation": "This member stands for all insurance contracts when disaggregated into insurance contracts issued and reinsurance contracts held. It also represents the standard value for the 'Disaggregation of insurance contracts' axis if no other member is used. [Refer: Insurance contracts [domain]]" } } }, "auth_ref": [ "r97", "r98", "r103", "r104", "r107" ] }, "bmo_DisclosureInTabularFormOfInterestAndDividendIncomeOnSecuritiesAndGainsOnSecuritiesInRespectOfInsuranceBusinessExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureInTabularFormOfInterestAndDividendIncomeOnSecuritiesAndGainsOnSecuritiesInRespectOfInsuranceBusinessExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/SecuritiesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Interest and Dividend Income and Gains on Securities", "label": "Disclosure In Tabular Form Of Interest And Dividend Income On Securities And Gains On Securities In Respect Of Insurance Business Explanatory [Table Text Block]", "documentation": "Disclosure in tabular form of interest and dividend income on securities and gains on securities in respect of insurance business." } } }, "auth_ref": [] }, "bmo_DisclosureInTabularFormOfInterestAndDividendIncomeOnSecuritiesAndGainsOnSecuritiesInRespectOfInsuranceBusinessLineItems": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureInTabularFormOfInterestAndDividendIncomeOnSecuritiesAndGainsOnSecuritiesInRespectOfInsuranceBusinessLineItems", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure In Tabular Form Of Interest And Dividend Income On Securities And Gains On Securities In Respect Of Insurance Business [Line Items]", "label": "Disclosure In Tabular Form Of Interest And Dividend Income On Securities And Gains On Securities In Respect Of Insurance Business [Line Items]", "documentation": "Disclosure In Tabular Form Of Interest And Dividend Income On Securities And Gains On Securities In Respect Of Insurance Business [Line Items]" } } }, "auth_ref": [] }, "bmo_DisclosureInTabularFormOfInterestAndDividendIncomeOnSecuritiesAndGainsOnSecuritiesInRespectOfInsuranceBusinessTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureInTabularFormOfInterestAndDividendIncomeOnSecuritiesAndGainsOnSecuritiesInRespectOfInsuranceBusinessTable", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure In Tabular Form Of Interest And Dividend Income On Securities And Gains On Securities In Respect Of Insurance Business [Table]", "label": "Disclosure In Tabular Form Of Interest And Dividend Income On Securities And Gains On Securities In Respect Of Insurance Business [Table]", "documentation": "Disclosure In Tabular Form Of Interest And Dividend Income On Securities And Gains On Securities In Respect Of Insurance Business [Table]" } } }, "auth_ref": [] }, "bmo_DisclosureOfAcquisitionsAndDivestituresExplanatoryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfAcquisitionsAndDivestituresExplanatoryTextBlock", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestitures" ], "lang": { "en-us": { "role": { "terseLabel": "Acquisitions and Divestitures", "label": "Disclosure Of Acquisitions And Divestitures Explanatory [Text Block]", "documentation": "Disclosure Of Acquisitions And Divestitures Explanatory" } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory", "presentation": [ "http://www.bmo.com/role/BasisofPresentation" ], "lang": { "en-us": { "role": { "terseLabel": "Basis of Presentation", "label": "Disclosure of basis of preparation of financial statements [text block]" } } }, "auth_ref": [ "r373" ] }, "bmo_DisclosureOfBasisOfPresentationAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfBasisOfPresentationAbstract", "lang": { "en-us": { "role": { "terseLabel": "Disclosure of Basis of Presentation [Abstract]", "label": "Disclosure of Basis of Presentation [Abstract]", "documentation": "Disclosure of Basis of Presentation" } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfBusinessCombinationsAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfBusinessCombinationsAbstract", "lang": { "en-us": { "role": { "label": "Disclosure of detailed information about business combination [abstract]" } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfBusinessCombinationsLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfBusinessCombinationsLineItems", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails", "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of detailed information about business combination [line items]", "label": "Disclosure of detailed information about business combination [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfBusinessCombinationsTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfBusinessCombinationsTable", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails", "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of detailed information about business combination [table]", "label": "Disclosure of detailed information about business combination [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to details of business combinations." } } }, "auth_ref": [ "r121", "r224" ] }, "bmo_DisclosureOfCapitalManagementAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfCapitalManagementAbstract", "lang": { "en-us": { "role": { "terseLabel": "Disclosure Of Capital Management [Abstract]", "label": "Disclosure of Capital Management [Abstract]", "documentation": "Disclosure of capital management." } } }, "auth_ref": [] }, "bmo_DisclosureOfCapitalManagementTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfCapitalManagementTextBlock", "presentation": [ "http://www.bmo.com/role/CapitalManagement" ], "lang": { "en-us": { "role": { "terseLabel": "Capital Management", "label": "Disclosure Of Capital Management [Text Block]", "documentation": "The entire disclosure of capital management." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfClassesOfShareCapitalAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfClassesOfShareCapitalAbstract", "lang": { "en-us": { "role": { "terseLabel": "Disclosure of classes of share capital [abstract]", "label": "Disclosure of classes of share capital [abstract]" } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfClassesOfShareCapitalExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfClassesOfShareCapitalExplanatory", "presentation": [ "http://www.bmo.com/role/EquityTables" ], "lang": { "en-us": { "role": { "verboseLabel": "Summary of Classes of Preferred and Common Shares Outstanding", "label": "Disclosure of classes of share capital [text block]" } }, "en": { "role": { "documentation": "The disclosure of classes of share capital. [Refer: Classes of share capital [domain]]" } } }, "auth_ref": [ "r184", "r247", "r278" ] }, "ifrs-full_DisclosureOfClassesOfShareCapitalLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfClassesOfShareCapitalLineItems", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of classes of share capital [line items]", "label": "Disclosure of classes of share capital [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfClassesOfShareCapitalTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfClassesOfShareCapitalTable", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of classes of share capital [table]", "label": "Disclosure of classes of share capital [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to classes of share capital." } } }, "auth_ref": [ "r184", "r247", "r278" ] }, "ifrs-full_DisclosureOfCreditRiskExposureLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfCreditRiskExposureLineItems", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of credit risk exposure [line items]", "label": "Disclosure of credit risk exposure [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfCreditRiskExposureTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfCreditRiskExposureTable", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of credit risk exposure [table]", "label": "Disclosure of credit risk exposure [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to the credit risk exposure." } } }, "auth_ref": [ "r137", "r238" ] }, "ifrs-full_DisclosureOfDefinedBenefitPlansLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfDefinedBenefitPlansLineItems", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of defined benefit plans [line items]", "label": "Disclosure of defined benefit plans [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfDefinedBenefitPlansTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfDefinedBenefitPlansTable", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of defined benefit plans [table]", "label": "Disclosure of defined benefit plans [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to defined benefit plans." } } }, "auth_ref": [ "r9", "r197" ] }, "bmo_DisclosureOfDepositLiabilitiesTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDepositLiabilitiesTableTextBlock", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Deposits", "label": "Disclosure Of Deposit Liabilities [Table Text Block]", "documentation": "The disclosure of deposit liabilities." } } }, "auth_ref": [] }, "bmo_DisclosureOfDepositsAndSubordinatedDebtAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDepositsAndSubordinatedDebtAbstract", "lang": { "en-us": { "role": { "terseLabel": "Disclosure of Deposits and Subordinated Debt [Abstract]", "label": "Disclosure of Deposits and Subordinated Debt [Abstract]", "documentation": "Disclosure of Deposits and Subordinated Debt" } } }, "auth_ref": [] }, "bmo_DisclosureOfDepositsAndSubordinatedLiabilitiesExplanatoryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDepositsAndSubordinatedLiabilitiesExplanatoryTextBlock", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebt" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits and Subordinated Debt", "label": "Disclosure Of Deposits And Subordinated Liabilities Explanatory [Text Block]", "documentation": "Disclosure of deposits and subordinated liabilities explanatory." } } }, "auth_ref": [] }, "bmo_DisclosureOfDepositsLineItems": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDepositsLineItems", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure Of Deposits [Line Items]", "label": "Disclosure Of Deposits [Line Items]", "documentation": "Disclosure Of Deposits [Line Items]" } } }, "auth_ref": [] }, "bmo_DisclosureOfDepositsPayableOnAFixedDateTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDepositsPayableOnAFixedDateTableTextBlock", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Deposits Payable On a Fixed Date", "label": "Disclosure Of Deposits Payable On A Fixed Date [Table Text Block]", "documentation": "Disclosure of deposits payable on a fixed date." } } }, "auth_ref": [] }, "bmo_DisclosureOfDepositsPayableToCustomersOnFixedDateLineItems": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDepositsPayableToCustomersOnFixedDateLineItems", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of deposits payable to customers on a fixed date [line items]", "label": "Disclosure of deposits payable to customers on a fixed date [line items]", "documentation": "Disclosure of deposits payable to customers on a fixed date [line items]" } } }, "auth_ref": [] }, "bmo_DisclosureOfDepositsPayableToCustomersOnFixedDateTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDepositsPayableToCustomersOnFixedDateTable", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of deposits payable to customers on a fixed date [table]", "label": "Disclosure of deposits payable to customers on a fixed date [table]", "documentation": "Disclosure of deposits payable to customers on a fixed date [table]" } } }, "auth_ref": [] }, "bmo_DisclosureOfDepositsTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDepositsTable", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure Of Deposits [Table]", "label": "Disclosure Of Deposits [Table]", "documentation": "Disclosure Of Deposits [Table]" } } }, "auth_ref": [] }, "bmo_DisclosureOfDetailedContinuityInformationAboutLossAllowanceByEachProductTypeTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDetailedContinuityInformationAboutLossAllowanceByEachProductTypeTableTextBlock", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Continuity in Loss Allowance by Each Product Type", "label": "Disclosure of detailed continuity information about loss allowance by each product type [Table Text Block]", "documentation": "Disclosure of detailed continuity information about loss allowance by each product type." } } }, "auth_ref": [] }, "bmo_DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/SecuritiesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Detailed Information About Amortized Cost Securities", "label": "Disclosure Of Detailed Information About Amortized Cost Securities Explanatory [Table Text Block]", "documentation": "Disclosure of detailed information about amortized cost securities explanatory." } } }, "auth_ref": [] }, "bmo_DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesLineItems": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesLineItems", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of Detailed Information About Amortized Cost Securities [Line Items]", "label": "Disclosure of Detailed Information About Amortized Cost Securities [Line Items]", "documentation": "Disclosure of detailed information about amortized cost securities." } } }, "auth_ref": [] }, "bmo_DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfDetailedInformationAboutAmortizedCostSecuritiesTable", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of Detailed Information About Amortized Cost Securities [Table]", "label": "Disclosure of Detailed Information About Amortized Cost Securities [Table]", "documentation": "Disclosure of detailed information about amortized cost securities." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfDetailedInformationAboutBusinessCombinationsExplanatory", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Fair Value of Assets Acquired and Liabilities Assumed at the Date of Acquisition", "label": "Disclosure of detailed information about business combination [text block]" } }, "en": { "role": { "documentation": "The disclosure of detailed information about business combinations. [Refer: Total for all business combinations [member]]" } } }, "auth_ref": [ "r125" ] }, "ifrs-full_DisclosureOfEarningsPerShareExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfEarningsPerShareExplanatory", "presentation": [ "http://www.bmo.com/role/EarningsPerShare" ], "lang": { "en-us": { "role": { "terseLabel": "Earnings Per Share", "label": "Disclosure of earnings per share [text block]" } }, "en": { "role": { "documentation": "The entire disclosure for earnings per share." } } }, "auth_ref": [ "r23" ] }, "bmo_DisclosureOfEmployeeCompensationAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfEmployeeCompensationAbstract", "lang": { "en-us": { "role": { "terseLabel": "Disclosure of Employee Compensation [Abstract]", "label": "Disclosure of Employee Compensation [Abstract]", "documentation": "Disclosure of Employee Compensation" } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfEntitysReportableSegmentsExplanatory", "presentation": [ "http://www.bmo.com/role/OperatingSegmentation" ], "lang": { "en-us": { "role": { "terseLabel": "Operating Segmentation", "label": "Disclosure of entity's operating segments [text block]" } }, "en": { "role": { "documentation": "The entire disclosure for operating segments." } } }, "auth_ref": [ "r168" ] }, "ifrs-full_DisclosureOfFairValueMeasurementExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfFairValueMeasurementExplanatory", "presentation": [ "http://www.bmo.com/role/FairValueMeasurements" ], "lang": { "en-us": { "role": { "terseLabel": "Fair Value Measurements", "label": "Disclosure of fair value measurement [text block]" } }, "en": { "role": { "documentation": "The entire disclosure for fair value measurement." } } }, "auth_ref": [ "r81" ] }, "ifrs-full_DisclosureOfFairValueMeasurementOfAssetsAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfFairValueMeasurementOfAssetsAbstract", "lang": { "en-us": { "role": { "terseLabel": "Disclosure of fair value measurement of assets [abstract]", "label": "Disclosure of fair value measurement of assets [abstract]" } } }, "auth_ref": [] }, "bmo_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTableTextBlock", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsTables" ], "lang": { "en-us": { "role": { "verboseLabel": "Summary of Assets and Liabilities categorized by the Fair Value Hierarchy", "label": "Disclosure of Fair Value Measurement of Assets and Liabilities [Table Text Block]", "documentation": "The disclosure of fair value measurement of assets and liabilities." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfFairValueMeasurementOfAssetsLineItems", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of fair value measurement of assets [line items]", "label": "Disclosure of fair value measurement of assets [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfFairValueMeasurementOfAssetsTable", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of fair value measurement of assets [table]", "label": "Disclosure of fair value measurement of assets [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to the fair value measurement of assets." } } }, "auth_ref": [ "r80", "r245" ] }, "bmo_DisclosureOfFairValuesOfFinancialInstrumentsNotCarriedAtFairValueOnBalanceSheetExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfFairValuesOfFinancialInstrumentsNotCarriedAtFairValueOnBalanceSheetExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsTables" ], "lang": { "en-us": { "role": { "terseLabel": "Fair Value of Financial Instruments Not Carried at Fair Value on the Balance Sheet", "label": "Disclosure of Fair Values of Financial Instruments Not Carried at Fair Value on Balance Sheet Explanatory [Table Text Block]", "documentation": "Fair Values of Financial Instruments Not Carried at Fair Value on the Balance Sheet." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfFinancialAssetsLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfFinancialAssetsLineItems", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of financial assets [line items]", "label": "Disclosure of financial assets [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfFinancialAssetsTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfFinancialAssetsTable", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofInterestIncomeCalculatedUsingEffectiveInterestMethodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of financial assets [table]", "label": "Disclosure of financial assets [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to financial assets." } } }, "auth_ref": [ "r142", "r226" ] }, "bmo_DisclosureOfFinancialAssetsThatArePastDueButNotImpairedExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfFinancialAssetsThatArePastDueButNotImpairedExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Disclosure Of Financial Assets That Are Past Due But Not Impaired", "label": "Disclosure Of Financial Assets That Are Past Due But Not Impaired Explanatory [Table Text Block]", "documentation": "Disclosure of financial assets that are past due but not impaired." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfFinancialInstrumentsLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfFinancialInstrumentsLineItems", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of detailed information about financial instruments [line items]", "label": "Disclosure of detailed information about financial instruments [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfFinancialInstrumentsTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfFinancialInstrumentsTable", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of detailed information about financial instruments [table]", "label": "Disclosure of detailed information about financial instruments [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to details of financial instruments." } } }, "auth_ref": [ "r133", "r136", "r142", "r226" ] }, "bmo_DisclosureOfIncomeTaxAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfIncomeTaxAbstract", "lang": { "en-us": { "role": { "label": "Disclosure of Income Tax [Abstract]", "documentation": "Disclosure of income taxes." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfIncomeTaxExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfIncomeTaxExplanatory", "presentation": [ "http://www.bmo.com/role/IncomeTaxes" ], "lang": { "en-us": { "role": { "terseLabel": "Income Taxes", "label": "Disclosure of income tax [text block]" } }, "en": { "role": { "documentation": "The entire disclosure for income taxes." } } }, "auth_ref": [ "r6" ] }, "ifrs-full_DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfIndirectMeasurementOfFairValueOfGoodsOrServicesReceivedShareOptionsGrantedDuringPeriodExplanatory", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Ranges of Values used for each Option Pricing Assumption", "label": "Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block]" } }, "en": { "role": { "documentation": "The disclosure of information about indirect, by reference to the fair value of the equity instruments granted, measurement of the fair value of goods or services received as consideration for the entity's share options." } } }, "auth_ref": [ "r116" ] }, "ifrs-full_DisclosureOfInsuranceContractsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfInsuranceContractsExplanatory", "presentation": [ "http://www.bmo.com/role/Insurance" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance", "label": "Disclosure of insurance contracts [text block]" } }, "en": { "role": { "documentation": "The entire disclosure for insurance contracts." } } }, "auth_ref": [ "r110" ] }, "bmo_DisclosureOfInsuranceInvestmentResultsExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfInsuranceInvestmentResultsExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/InsuranceTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Insurance Investment Results", "label": "Disclosure Of Insurance Investment Results Explanatory [Table Text Block]", "documentation": "Disclosure of insurance investment results explanatory." } } }, "auth_ref": [] }, "bmo_DisclosureOfInsuranceServiceResultExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfInsuranceServiceResultExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/InsuranceTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Insurance Service Results", "label": "Disclosure Of Insurance Service Result Explanatory [Table Text Block]", "documentation": "Disclosure of insurance service result explanatory." } } }, "auth_ref": [] }, "bmo_DisclosureOfInterestDividendAndFeeIncomeLineItems": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfInterestDividendAndFeeIncomeLineItems", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestIncomeCalculatedUsingEffectiveInterestMethodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure Of interest, dividend and fee income [Line Items]", "label": "Disclosure Of interest, dividend and fee income [Line Items]", "documentation": "Disclosure Of interest, dividend and fee income [Line Items]" } } }, "auth_ref": [] }, "bmo_DisclosureOfInterestDividendAndFeeIncomeTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfInterestDividendAndFeeIncomeTableTextBlock", "presentation": [ "http://www.bmo.com/role/SecuritiesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Interest, Dividend and Fee Income", "label": "Disclosure of interest, dividend and fee income [Table Text Block]", "documentation": "Disclosure of interest, dividend and fee income [text block]" } } }, "auth_ref": [] }, "bmo_DisclosureOfKeyEconomicVariablesUsedToEstimateAllowanceOnPerformingLoansDuringForecastPeriodExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfKeyEconomicVariablesUsedToEstimateAllowanceOnPerformingLoansDuringForecastPeriodExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Key Economic Variables Used to Estimate Allowance on Performing Loans During Forecast Period", "label": "Disclosure of Key Economic Variables Used to Estimate Allowance on Performing Loans During Forecast Period Explanatory [Table Text Block]", "documentation": "Disclosure of key economic variables used to estimate allowance on performing loans during forecast period." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfLoansAndAdvancesToCustomersExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfLoansAndAdvancesToCustomersExplanatory", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLosses" ], "lang": { "en-us": { "role": { "terseLabel": "Loans and Allowance for Credit Losses", "label": "Disclosure of loans and advances to customers [text block]" } }, "en": { "role": { "documentation": "The disclosure of loans and advances to customers. [Refer: Loans and advances to customers]" } } }, "auth_ref": [ "r373" ] }, "bmo_DisclosureOfLoansAndAllowanceForCreditLossesAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfLoansAndAllowanceForCreditLossesAbstract", "lang": { "en-us": { "role": { "terseLabel": "Disclosure of Loans and Allowance for Credit Losses [Abstract]", "label": "Disclosure of Loans and Allowance for Credit Losses [Abstract]", "documentation": "Disclosure of loans and allowance for credit losses." } } }, "auth_ref": [] }, "bmo_DisclosureOfLoansCreditRiskExposureExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfLoansCreditRiskExposureExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Credit Risk Exposures for Loans Carried at Amortized Cost, FVOCI or FVTPL", "label": "Disclosure of loans credit risk exposure Explanatory [Table Text Block]", "documentation": "The disclosure of loans credit risk exposure." } } }, "auth_ref": [] }, "bmo_DisclosureOfMaturityScheduleForDepositsGreaterThanOneHundredThousandDollarsBookedInCanadaTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfMaturityScheduleForDepositsGreaterThanOneHundredThousandDollarsBookedInCanadaTableTextBlock", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Maturity Schedule for Deposits Greater than One Hundred Thousand Dollars Booked In Canada", "label": "Disclosure Of Maturity Schedule For Deposits Greater Than One Hundred Thousand Dollars Booked In Canada [Table Text Block]", "documentation": "Disclosure of maturity schedule for deposits greater than one hundred thousand dollars booked in Canada." } } }, "auth_ref": [] }, "bmo_DisclosureOfNonInterestRevenueExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfNonInterestRevenueExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/SecuritiesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Non Interest Revenue", "label": "Disclosure of non interest revenue explanatory [Table Text Block]", "documentation": "Disclosure of non interest revenue explanatory." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfOperatingSegmentsAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfOperatingSegmentsAbstract", "lang": { "en-us": { "role": { "label": "Disclosure of operating segments [abstract]" } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfOperatingSegmentsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfOperatingSegmentsExplanatory", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Operating Segments", "label": "Disclosure of operating segments [text block]" } }, "en": { "role": { "documentation": "The disclosure of operating segments. [Refer: Operating segments [member]]" } } }, "auth_ref": [ "r157" ] }, "ifrs-full_DisclosureOfOperatingSegmentsLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfOperatingSegmentsLineItems", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of operating segments [line items]", "label": "Disclosure of operating segments [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfOperatingSegmentsTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfOperatingSegmentsTable", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of operating segments [table]", "label": "Disclosure of operating segments [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to operating segments." } } }, "auth_ref": [ "r157" ] }, "bmo_DisclosureOfPensionAndOtherPostEmploymentBenefitExpenseTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfPensionAndOtherPostEmploymentBenefitExpenseTableTextBlock", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Pension and Other Employee Future Benefit Expenses", "label": "Disclosure of pension and other post employment benefit expense [Table Text Block]", "documentation": "Disclosure of pension and other post employment benefit expense." } } }, "auth_ref": [] }, "bmo_DisclosureOfReconciliationOfChangesInFairValueMeasurementAssetsLiabilitiesTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfReconciliationOfChangesInFairValueMeasurementAssetsLiabilitiesTableTextBlock", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Changes in Level 3 Instruments Carried at Fair Value", "label": "Disclosure Of Reconciliation Of Changes In Fair Value Measurement Assets Liabilities [Table Text Block]", "documentation": "Disclosure of reconciliation of changes in fair value measurement assets liabilities." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfReconciliationOfChangesInInsuranceContractsByRemainingCoverageAndIncurredClaimsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfReconciliationOfChangesInInsuranceContractsByRemainingCoverageAndIncurredClaimsExplanatory", "presentation": [ "http://www.bmo.com/role/InsuranceTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of the Insurance Liability by Remaining Coverage and Incurred Claims", "label": "Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [text block]" } }, "en": { "role": { "documentation": "The disclosure of the reconciliation of changes in insurance contracts by remaining coverage and incurred claims. [Refer: Insurance contracts [domain]]" } } }, "auth_ref": [ "r90" ] }, "ifrs-full_DisclosureOfReconciliationOfChangesInInsuranceContractsByRemainingCoverageAndIncurredClaimsLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfReconciliationOfChangesInInsuranceContractsByRemainingCoverageAndIncurredClaimsLineItems", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails", "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]", "label": "Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfReconciliationOfChangesInInsuranceContractsByRemainingCoverageAndIncurredClaimsTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfReconciliationOfChangesInInsuranceContractsByRemainingCoverageAndIncurredClaimsTable", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails", "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [table]", "label": "Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to the reconciliation of changes in insurance contracts by remaining coverage and incurred claims." } } }, "auth_ref": [ "r90" ] }, "bmo_DisclosureOfRegulatoryCapitalAndCapitalRatiosTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfRegulatoryCapitalAndCapitalRatiosTableTextBlock", "presentation": [ "http://www.bmo.com/role/CapitalManagementTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Regulatory Capital Measure and Risk-Weighted Assets", "label": "Disclosure of regulatory capital and capital ratios [Table Text Block]", "documentation": "Disclosure of regulatory capital and capital ratios." } } }, "auth_ref": [] }, "bmo_DisclosureOfSecuritiesAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfSecuritiesAbstract", "lang": { "en-us": { "role": { "terseLabel": "Disclosure of Securities [Abstract]", "label": "Disclosure of Securities [Abstract]", "documentation": "Disclosure of Securities" } } }, "auth_ref": [] }, "bmo_DisclosureOfSecuritiesExplanatoryTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfSecuritiesExplanatoryTextBlock", "presentation": [ "http://www.bmo.com/role/Securities" ], "lang": { "en-us": { "role": { "terseLabel": "Securities", "label": "Disclosure of Securities Explanatory [Text Block]", "documentation": "Disclosure of Securities Explanatory" } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfSensitivityAnalysisToChangesInRiskExposuresThatAriseFromContractsWithinScopeOfIFRS17Explanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfSensitivityAnalysisToChangesInRiskExposuresThatAriseFromContractsWithinScopeOfIFRS17Explanatory", "presentation": [ "http://www.bmo.com/role/InsuranceTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Sensitivity Analysis to Changes in Risk Exposures that Arise from Contracts Within Scope of IFRS 17", "label": "Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [text block]" } }, "en": { "role": { "documentation": "The disclosure of the sensitivity analysis to changes in risk variables that arise from contracts within the scope of IFRS 17." } } }, "auth_ref": [ "r101" ] }, "ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory", "presentation": [ "http://www.bmo.com/role/Equity" ], "lang": { "en-us": { "role": { "terseLabel": "Equity", "label": "Disclosure of share capital, reserves and other equity interest [text block]" } }, "en": { "role": { "documentation": "The entire disclosure for share capital, reserves and other equity interest." } } }, "auth_ref": [ "r185", "r248", "r279" ] }, "ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfSharebasedPaymentArrangementsExplanatory", "presentation": [ "http://www.bmo.com/role/EmployeeCompensation" ], "lang": { "en-us": { "role": { "terseLabel": "Employee Compensation", "label": "Disclosure of share-based payment arrangements [text block]" } }, "en": { "role": { "documentation": "The entire disclosure for share-based payment arrangements." } } }, "auth_ref": [ "r111" ] }, "bmo_DisclosureOfSharebasedPaymentTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfSharebasedPaymentTable", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of sharebased payment [table]", "label": "Disclosure of sharebased payment [table]", "documentation": "Disclosure of sharebased payment [table]" } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfSignificantUnobservableInputsUsedInFairValueMeasurementOfAssetsExplanatory", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsTables" ], "lang": { "en-us": { "role": { "terseLabel": "Significant Unobservable Inputs in Level 3 Instrument Valuations", "label": "Disclosure of significant unobservable inputs used in fair value measurement of assets [text block]" } }, "en": { "role": { "documentation": "The disclosure of significant inputs for which market data are not available and that are developed using the best information available about the assumptions that market participants would use when measuring the fair value of assets." } } }, "auth_ref": [ "r73" ] }, "ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of terms and conditions of share-based payment arrangement [line items]", "label": "Disclosure of terms and conditions of share-based payment arrangement [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "bmo_DisclosureOfUnrealizedGainsAndLossesSecuritiesFVOCIExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DisclosureOfUnrealizedGainsAndLossesSecuritiesFVOCIExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/SecuritiesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Unrealized Gains and Losses on Securities at Fair Value through other Comprehensive Income", "label": "Disclosure of Unrealized Gains and Losses Securities F V O C I Explanatory [Table Text Block]", "documentation": "The disclosure of unrealized gains and losses on securities at fair value through other comprehensive income." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItemsExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItemsExplanatory", "presentation": [ "http://www.bmo.com/role/InsuranceTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Yield Curve Used to Discount Cash Flows that do not Vary Based on Underlying Items", "label": "Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [text block]" } }, "en": { "role": { "documentation": "The disclosure of the yield curve used to discount cash flows that do not vary based on the returns on underlying items, applying paragraph 36 of IFRS 17." } } }, "auth_ref": [ "r100" ] }, "ifrs-full_DisclosureOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItemsLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItemsLineItems", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]", "label": "Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_DisclosureOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItemsTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DisclosureOfYieldCurveUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItemsTable", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [table]", "label": "Disclosure of yield curve used to discount cash flows that do not vary based on returns on underlying items [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to the yield curve used to discount cash flows that do not vary based on the returns on underlying items." } } }, "auth_ref": [ "r100" ] }, "ifrs-full_DividendsPaidClassifiedAsFinancingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DividendsPaidClassifiedAsFinancingActivities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": -1.0, "order": 7.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Cash dividends and distributions paid", "label": "Dividends paid, classified as financing activities" } }, "en": { "role": { "documentation": "The cash outflow for dividends paid by the entity, classified as financing activities." } } }, "auth_ref": [ "r45" ] }, "ifrs-full_DividendsPaidOrdinaryShares": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DividendsPaidOrdinaryShares", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "negatedLabel": "Dividends on common shares", "label": "Dividends paid, ordinary shares" } }, "en": { "role": { "documentation": "The amount of dividends paid by the entity on ordinary shares. [Refer: Ordinary shares [member]]" } } }, "auth_ref": [ "r24", "r202" ] }, "ifrs-full_DividendsPaidOtherShares": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DividendsPaidOtherShares", "crdr": "debit", "calculation": { "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails": { "parentTag": "ifrs-full_ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Dividends on preferred shares and distributions on other equity instruments", "label": "Dividends paid, other shares" } }, "en": { "role": { "documentation": "The amount of dividends paid by the entity on shares other than ordinary shares. [Refer: Ordinary shares [member]]" } } }, "auth_ref": [ "r24", "r202" ] }, "ifrs-full_DividendsPaidToNoncontrollingInterests": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DividendsPaidToNoncontrollingInterests", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Dividends to non-controlling interest in subsidiaries", "label": "Dividends paid to non-controlling interests" } }, "en": { "role": { "documentation": "The amount of dividends paid to non-controlling interests. [Refer: Non-controlling interests]" } } }, "auth_ref": [ "r62" ] }, "ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": -1.0, "order": 10.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Cash dividends paid to non-controlling interest", "label": "Dividends paid to non-controlling interests, classified as financing activities" } }, "en": { "role": { "documentation": "The cash outflow for dividends paid to non-controlling interests, classified as financing activities. [Refer: Non-controlling interests; Dividends paid to non-controlling interests]" } } }, "auth_ref": [ "r360" ] }, "ifrs-full_DividendsReceivedClassifiedAsOperatingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DividendsReceivedClassifiedAsOperatingActivities", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Dividends received in the period", "label": "Dividends received, classified as operating activities" } }, "en": { "role": { "documentation": "The cash inflow from dividends received, classified as operating activities. [Refer: Dividends received]" } } }, "auth_ref": [ "r45" ] }, "ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare": { "xbrltype": "perShareItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "DividendsRecognisedAsDistributionsToOwnersPerShare", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Dividends per common share (in canadian dollars per share)", "verboseLabel": "Dividends declared per share (in canadian dollars per share)", "label": "Dividends recognised as distributions to owners per share" } }, "en": { "role": { "documentation": "The amount, per share, of dividends recognised as distributions to owners." } } }, "auth_ref": [ "r182", "r249", "r261" ] }, "dei_DocumentFiscalPeriodFocus": { "xbrltype": "fiscalPeriodItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentFiscalPeriodFocus", "presentation": [ "http://www.bmo.com/role/CoverPage" ], "lang": { "en-us": { "role": { "terseLabel": "Document Fiscal Period Focus", "label": "Document Fiscal Period Focus", "documentation": "Fiscal period values are FY, Q1, Q2, and Q3. 1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY." } } }, "auth_ref": [] }, "dei_DocumentFiscalYearFocus": { "xbrltype": "gYearItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentFiscalYearFocus", "presentation": [ "http://www.bmo.com/role/CoverPage" ], "lang": { "en-us": { "role": { "terseLabel": "Document Fiscal Year Focus", "label": "Document Fiscal Year Focus", "documentation": "This is focus fiscal year of the document report in YYYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006." } } }, "auth_ref": [] }, "dei_DocumentPeriodEndDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentPeriodEndDate", "presentation": [ "http://www.bmo.com/role/CoverPage" ], "lang": { "en-us": { "role": { "terseLabel": "Document Period End Date", "label": "Document Period End Date", "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD." } } }, "auth_ref": [] }, "dei_DocumentType": { "xbrltype": "submissionTypeItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentType", "presentation": [ "http://www.bmo.com/role/CoverPage" ], "lang": { "en-us": { "role": { "terseLabel": "Document Type", "label": "Document Type", "documentation": "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'." } } }, "auth_ref": [] }, "bmo_DomesticStabilityBufferPercentage": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DomesticStabilityBufferPercentage", "presentation": [ "http://www.bmo.com/role/CapitalManagementAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Domestic stability buffer, percentage", "label": "Domestic stability buffer, percentage", "documentation": "Domestic stability buffer, percentage." } } }, "auth_ref": [] }, "bmo_DownsideScenariosMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "DownsideScenariosMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Downside", "label": "Downside Scenarios [Member]", "documentation": "Downside scenarios." } } }, "auth_ref": [] }, "bmo_EVEBITDAMultipleSignificantUnobservableInputsAssets": { "xbrltype": "pureItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "EVEBITDAMultipleSignificantUnobservableInputsAssets", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Multiple", "label": "EV EBITDA Multiple Significant Unobservable Inputs Assets", "documentation": "A EV/EBITDA multiple used as a significant Level 3 unobservable input for assets." } } }, "auth_ref": [] }, "ifrs-full_EarningsPerShareAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EarningsPerShareAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "verboseLabel": "Earnings Per Common Share (Canadian $) (Note 10)", "label": "Earnings per share [abstract]" } } }, "auth_ref": [] }, "ifrs-full_EarningsPerShareExplanatory": { "xbrltype": "textBlockItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EarningsPerShareExplanatory", "presentation": [ "http://www.bmo.com/role/EarningsPerShareTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Basic and Diluted Earnings Per Share", "label": "Earnings per share [text block]" } }, "en": { "role": { "documentation": "The disclosure of earnings per share." } } }, "auth_ref": [ "r19" ] }, "ifrs-full_EarningsPerShareLineItems": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EarningsPerShareLineItems", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Earnings per share [line items]", "label": "Earnings per share [line items]" } }, "en": { "role": { "documentation": "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." } } }, "auth_ref": [] }, "ifrs-full_EarningsPerShareTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EarningsPerShareTable", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Earnings per share [table]", "label": "Earnings per share [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to earnings per share." } } }, "auth_ref": [ "r19" ] }, "ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EffectOfExchangeRateChangesOnCashAndCashEquivalents", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Effect of Exchange Rate Changes on Cash and Cash Equivalents", "label": "Effect of exchange rate changes on cash and cash equivalents" } }, "en": { "role": { "documentation": "The effect of exchange rate changes on cash and cash equivalents held or due in a foreign currency. [Refer: Cash and cash equivalents]" } } }, "auth_ref": [ "r43", "r44" ] }, "bmo_EmbeddedOptionsRelatedToStructuredDepositsCarriedAtAmortizedCost": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "EmbeddedOptionsRelatedToStructuredDepositsCarriedAtAmortizedCost", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Embedded options related to structured deposits carried at amortized cost", "label": "Embedded Options Related To Structured Deposits Carried At Amortized Cost", "documentation": "Embedded options related to structured deposits carried at amortized cost." } } }, "auth_ref": [] }, "ifrs-full_EmployeeBenefitsExpense": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EmployeeBenefitsExpense", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestExpense1", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Employee compensation", "label": "Employee benefits expense" } } }, "auth_ref": [ "r181", "r254", "r296", "r348" ] }, "dei_EntityCentralIndexKey": { "xbrltype": "centralIndexKeyItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityCentralIndexKey", "presentation": [ "http://www.bmo.com/role/CoverPage" ], "lang": { "en-us": { "role": { "terseLabel": "Entity Central Index Key", "label": "Entity Central Index Key", "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK." } } }, "auth_ref": [ "r354" ] }, "dei_EntityRegistrantName": { "xbrltype": "normalizedStringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityRegistrantName", "presentation": [ "http://www.bmo.com/role/CoverPage" ], "lang": { "en-us": { "role": { "terseLabel": "Entity Registrant Name", "label": "Entity Registrant Name", "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC." } } }, "auth_ref": [ "r354" ] }, "ifrs-full_Equity": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "Equity", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_EquityAndLiabilities", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Total Equity", "periodStartLabel": "Balance at beginning of period", "periodEndLabel": "Balance at end of period", "terseLabel": "Amount", "label": "Equity" } }, "en": { "role": { "documentation": "The amount of residual interest in the assets of the entity after deducting all its liabilities." } } }, "auth_ref": [ "r53", "r55", "r71", "r72", "r78", "r200", "r216", "r241", "r242", "r250", "r270", "r276" ] }, "ifrs-full_EquityAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EquityAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Equity", "label": "Equity [abstract]" } } }, "auth_ref": [] }, "ifrs-full_EquityAndLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EquityAndLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Total Liabilities and Equity", "label": "Equity and liabilities" } }, "en": { "role": { "documentation": "The amount of the entity's equity and liabilities. [Refer: Equity; Liabilities]" } } }, "auth_ref": [ "r270" ] }, "ifrs-full_EquityAndLiabilitiesAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EquityAndLiabilitiesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Liabilities and Equity", "label": "Equity and liabilities [abstract]" } } }, "auth_ref": [] }, "ifrs-full_EquityAttributableToOwnersOfParent": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EquityAttributableToOwnersOfParent", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Equity", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Total shareholders\u2019 equity", "label": "Equity attributable to owners of parent" } }, "en": { "role": { "documentation": "The amount of equity attributable to the owners of the parent. This specifically excludes non-controlling interest." } } }, "auth_ref": [ "r269" ] }, "ifrs-full_EquityAttributableToOwnersOfParentMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EquityAttributableToOwnersOfParentMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Total Shareholders\u2019 Equity", "label": "Equity attributable to owners of parent [member]" } }, "en": { "role": { "documentation": "This member stands for equity attributable to the owners of the parent." } } }, "auth_ref": [ "r260" ] }, "bmo_EquityContractsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "EquityContractsMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Equity contracts", "label": "Equity Contracts [member]", "documentation": "Equity contracts." } } }, "auth_ref": [] }, "ifrs-full_EquityInterestsOfAcquirer": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "EquityInterestsOfAcquirer", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Equity interests of acquirer", "label": "Equity interests of acquirer" } }, "en": { "role": { "documentation": "The fair value, at the acquisition date, of equity interests of the acquirer transferred as consideration in a business combination. [Refer: Total for all business combinations [member]]" } } }, "auth_ref": [ "r118", "r221" ] }, "bmo_ExceptionallyLowProbabilityOfDefaultMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ExceptionallyLowProbabilityOfDefaultMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Exceptionally low", "label": "Exceptionally low probability of default [member]", "documentation": "Exceptionally low probability of default." } } }, "auth_ref": [] }, "ifrs-full_ExchangeDifferencesOnTranslationAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ExchangeDifferencesOnTranslationAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "verboseLabel": "Net (losses) on translation of net foreign operations", "label": "Exchange differences on translation [abstract]" } } }, "auth_ref": [] }, "bmo_ExpectedCreditLossPeriod": { "xbrltype": "durationItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ExpectedCreditLossPeriod", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Expected credit loss period", "label": "Expected credit loss period", "documentation": "Expected credit loss period." } } }, "auth_ref": [] }, "ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted": { "xbrltype": "percentItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ExpectedDividendAsPercentageShareOptionsGranted", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Expected dividend yield", "label": "Expected dividend as percentage, share options granted" } }, "en": { "role": { "documentation": "The percentage of an expected dividend used to calculate the fair value of share options granted." } } }, "auth_ref": [ "r115" ] }, "bmo_ExpectedImpactOfAssetsReclassifiedToHeldForSaleAfterTax": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ExpectedImpactOfAssetsReclassifiedToHeldForSaleAfterTax", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Charge recognized on assets reclassified to held for sale, after tax", "label": "Expected Impact Of Assets Reclassified To Held For Sale, After Tax", "documentation": "Expected Impact Of Assets Reclassified To Held For Sale, After Tax" } } }, "auth_ref": [] }, "bmo_ExpectedImpactOfAssetsReclassifiedToHeldForSaleBeforeTax": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ExpectedImpactOfAssetsReclassifiedToHeldForSaleBeforeTax", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Charge recognized on assets reclassified to held for sale, before tax", "label": "Expected Impact Of Assets Reclassified To Held For Sale, Before Tax", "documentation": "Expected Impact Of Assets Reclassified To Held For Sale, Before Tax" } } }, "auth_ref": [] }, "bmo_ExpectedOwnershipOfInterestInSubsidiary": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ExpectedOwnershipOfInterestInSubsidiary", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Equity interest ownership percent", "label": "Expected Ownership Of Interest In Subsidiary", "documentation": "Expected Ownership Of Interest In Subsidiary" } } }, "auth_ref": [] }, "ifrs-full_ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Commitments and financial guarantee contracts", "label": "Exposure to credit risk on loan commitments and financial guarantee contracts" } }, "en": { "role": { "documentation": "The amount of the exposure to credit risk on loan commitments and financial guarantee contracts. [Refer: Loan commitments [member]; Financial guarantee contracts [member]; Credit risk [member]]" } } }, "auth_ref": [ "r134", "r135", "r137", "r236", "r237", "r238" ] }, "bmo_ExposureToCreditRiskOnLoansOrReceivables": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ExposureToCreditRiskOnLoansOrReceivables", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Credit risk exposure for loans", "label": "Exposure To Credit Risk On Loans Or Receivables", "documentation": "Exposure to credit risk on loans or receivables." } } }, "auth_ref": [] }, "ifrs-full_ExternalCreditGradesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ExternalCreditGradesAxis", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "External credit grades [axis]", "label": "External credit grades [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r322", "r332", "r346" ] }, "ifrs-full_ExternalCreditGradesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ExternalCreditGradesDomain", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "External credit grades [domain]", "label": "External credit grades [domain]" } }, "en": { "role": { "documentation": "This member stands for the standard value for the 'External credit grades' axis if no other member is used." } } }, "auth_ref": [ "r322", "r332", "r346" ] }, "bmo_FairValueMeasurementAxis": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "FairValueMeasurementAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Fair value measurement [axis]", "label": "Fair value measurement [axis]", "documentation": "The axis of a table defines the relationshis between the domain members or categories in the table and the line items or concepts that complete the table." } } }, "auth_ref": [] }, "bmo_FairValueMeasurementDomain": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "FairValueMeasurementDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Fair Value Measurement [Domain]", "label": "Fair Value Measurement [Domain]", "documentation": "Fair value measurement [Domain]" } } }, "auth_ref": [] }, "bmo_FairValueThroughProfitOrLossLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "FairValueThroughProfitOrLossLoansMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "FVTPL loans", "label": "Fair Value Through Profit Or Loss Loans [Member]", "documentation": "Fair Value Through Profit Or Loss Loans [Member]" } } }, "auth_ref": [] }, "ifrs-full_FeeAndCommissionIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FeeAndCommissionIncome", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Securities commissions and fees", "label": "Fee and commission income" } } }, "auth_ref": [ "r379" ] }, "ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsAtAmortisedCostCategoryMember", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestIncomeCalculatedUsingEffectiveInterestMethodDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Amortized cost securities", "label": "Financial assets at amortised cost, category [member]" } }, "en": { "role": { "documentation": "This member stands for the financial assets at amortised cost category. [Refer: Financial assets at amortised cost]" } } }, "auth_ref": [ "r145", "r229" ] }, "ifrs-full_FinancialAssetsAtAmortisedCostMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsAtAmortisedCostMember", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Cost or amortized cost", "label": "Financial assets at amortised cost, class [member]" } }, "en": { "role": { "documentation": "This member stands for the financial assets measured at amortised cost class. [Refer: Financial assets at amortised cost]" } } }, "auth_ref": [ "r149", "r172", "r232" ] }, "ifrs-full_FinancialAssetsAtFairValue": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsAtFairValue", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Fair value of assets", "periodStartLabel": "Assets at beginning of period", "periodEndLabel": "Assets at end of period", "label": "Financial assets, at fair value" } }, "en": { "role": { "documentation": "The fair value of financial assets. [Refer: At fair value [member]; Financial assets]" } } }, "auth_ref": [ "r132" ] }, "ifrs-full_FinancialAssetsAtFairValueMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsAtFairValueMember", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Fair value", "label": "Financial assets at fair value, class [member]" } }, "en": { "role": { "documentation": "This member stands for the financial assets measured at fair value class. [Refer: Financial assets; At fair value [member]]" } } }, "auth_ref": [ "r149" ] }, "ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/SecuritiesSummaryofInterestIncomeCalculatedUsingEffectiveInterestMethodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "FVOCI securities", "label": "Financial assets at fair value through other comprehensive income, category [member]" } }, "en": { "role": { "documentation": "This member stands for the financial assets at fair value through other comprehensive income category. [Refer: Financial assets at fair value through other comprehensive income]" } } }, "auth_ref": [ "r146", "r230" ] }, "ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "FVTPL Securities", "label": "Financial assets at fair value through profit or loss, category [member]" } }, "en": { "role": { "documentation": "This member stands for the financial assets at fair value through profit or loss category. [Refer: Financial assets at fair value through profit or loss]" } } }, "auth_ref": [ "r143", "r227" ] }, "ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading", "crdr": "debit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails": { "parentTag": "bmo_BankSecuritiesCarryingAmount", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Trading securities", "label": "Financial assets at fair value through profit or loss, classified as held for trading" } }, "en": { "role": { "documentation": "The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss, mandatorily measured at fair value]" } } }, "auth_ref": [ "r377" ] }, "ifrs-full_FinancialAssetsHeldForManagingLiquidityRisk": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsHeldForManagingLiquidityRisk", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Unencumbered liquid assets", "label": "Financial assets held for managing liquidity risk" } }, "en": { "role": { "documentation": "The amount of financial assets held for managing liquidity risk (for example, financial assets that are readily saleable or expected to generate cash inflows to meet cash outflows on financial liabilities). [Refer: Liquidity risk [member]; Financial assets; Financial liabilities]" } } }, "auth_ref": [ "r148" ] }, "bmo_FinancialAssetsOrLiabilitiesMeasuredAtFairValueMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "FinancialAssetsOrLiabilitiesMeasuredAtFairValueMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Financial assets or liabilities, measured at fair value", "verboseLabel": "Measured at fair value", "label": "Financial assets or liabilities, measured at fair value [Member]", "documentation": "Measured at fair value." } } }, "auth_ref": [] }, "ifrs-full_FinancialAssetsPastDueButNotImpairedMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialAssetsPastDueButNotImpairedMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Financial assets past due but not impaired", "label": "Financial assets past due but not impaired [member]" } }, "en": { "role": { "documentation": "This member stands for financial assets that are past due but not impaired. A financial asset is past due when a counterparty has failed to make a payment when contractually due. [Refer: Financial assets]" } } }, "auth_ref": [ "r251" ] }, "ifrs-full_FinancialLiabilitiesAtFairValue": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialLiabilitiesAtFairValue", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Fair value liabilities", "periodStartLabel": "Liabilities at beginning of period", "periodEndLabel": "Liabilities at end of period", "label": "Financial liabilities, at fair value" } }, "en": { "role": { "documentation": "The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]" } } }, "auth_ref": [ "r132" ] }, "ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Financial liabilities at fair value through profit or loss, category", "label": "Financial liabilities at fair value through profit or loss, category [member]" } }, "en": { "role": { "documentation": "This member stands for the financial liabilities at fair value through profit or loss category. [Refer: Financial liabilities at fair value through profit or loss]" } } }, "auth_ref": [ "r144", "r228" ] }, "bmo_First12MonthsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "First12MonthsMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "First 12 months", "label": "First 12 Months [Member]", "documentation": "First 12 Months." } } }, "auth_ref": [] }, "bmo_FirstCitizensAndTrustCompanyMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "FirstCitizensAndTrustCompanyMember", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "First Citizens and Trust Company", "label": "First Citizens And Trust Company [Member]", "documentation": "First Citizens And Trust Company" } } }, "auth_ref": [] }, "bmo_FivePointSixTwoFivePercentageLimitedRecourseCapitalNotesSeriesTwoMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "FivePointSixTwoFivePercentageLimitedRecourseCapitalNotesSeriesTwoMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "5.625% Limited Recourse Capital Notes, Series 2 (LRCNs, Series 2)", "label": "Five Point Six Two Five Percentage Limited Recourse Capital Notes Series Two [Member]", "documentation": "5.625% Limited Recourse Capital Notes, Series 2 (Series 2 LRCNs)." } } }, "auth_ref": [] }, "bmo_ForeignExchangeContractsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ForeignExchangeContractsMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Foreign exchange contracts", "label": "Foreign Exchange Contracts [member]", "documentation": "Foreign exchange contracts." } } }, "auth_ref": [] }, "bmo_FourPointEightPercentageAdditionalTier1CapitalNotesNvccMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "FourPointEightPercentageAdditionalTier1CapitalNotesNvccMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "4.800% Additional Tier 1 Capital Notes (AT1 Notes)", "label": "Four Point Eight percentage Additional Tier 1 Capital Notes NVCC [Member]", "documentation": "4.8% Additional Tier 1 Capital Notes (NVCC)." } } }, "auth_ref": [] }, "bmo_FourPointThreePercentageLimitedRecourseCapitalNotesSeriesOneMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "FourPointThreePercentageLimitedRecourseCapitalNotesSeriesOneMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "4.300% Limited Recourse Capital Notes, Series 1 (LRCNs, Series 1)", "label": "Four Point Three Percentage Limited Recourse Capital Notes Series One [Member]", "documentation": "4.3% Limited Recourse Capital Notes Series 1 [Member]." } } }, "auth_ref": [] }, "ifrs-full_GainsLossesOnCashFlowHedgesNetOfTax": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesOnCashFlowHedgesNetOfTax", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Gains (losses) on derivatives designated as cash flow hedges arising during the period", "label": "Gains (losses) on cash flow hedges, net of tax" } }, "en": { "role": { "documentation": "The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax, before reclassification adjustments. [Refer: Cash flow hedges [member]]" } } }, "auth_ref": [ "r129", "r131", "r233", "r294" ] }, "ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesOnExchangeDifferencesOnTranslationNetOfTax", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "bmo_OtherComprehensiveIncomeNetOfTaxesTranslationOfNetForeignOperations", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "verboseLabel": "Unrealized (losses) on translation of net foreign operations", "terseLabel": "Unrealized (losses) on translation of net foreign operations", "label": "Gains (losses) on exchange differences on translation of foreign operations, net of tax" } }, "en": { "role": { "documentation": "The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax, before reclassification adjustments. [Refer: Other comprehensive income]" } } }, "auth_ref": [ "r294" ] }, "ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 9.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Foreign exchange gains, other than trading", "label": "Foreign exchange gain (loss)" } }, "en": { "role": { "documentation": "The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Classes of financial instruments [domain]]" } } }, "auth_ref": [ "r13", "r199", "r262" ] }, "ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition", "crdr": "credit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails": { "parentTag": "bmo_InterestAndDividendIncomeAndGainLossesOnFinancialAssets", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Losses from securities designated at FVTPL", "label": "Gains (losses) on financial assets at fair value through profit or loss, designated upon initial recognition or subsequently" } } }, "auth_ref": [ "r127" ] }, "ifrs-full_GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "verboseLabel": "Unrealized gains (losses) on fair value through OCI debt securities arising during the period", "terseLabel": "Unrealized gains (losses) on fair value through OCI debt securities arising during the period", "label": "Gains (losses) on financial assets measured at fair value through other comprehensive income, net of tax" } }, "en": { "role": { "documentation": "The gains (losses) recognised in other comprehensive income on financial assets measured at fair value through other comprehensive income applying paragraph 4.1.2A of IFRS 9, net of tax, before reclassification adjustments. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]" } } }, "auth_ref": [ "r294" ] }, "ifrs-full_GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "bmo_OtherComprehensiveIncomeNetOfTaxesTranslationOfNetForeignOperations", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "verboseLabel": "Unrealized gains on hedges of net foreign operations", "terseLabel": "Unrealized gains on hedges of net foreign operations", "label": "Gains (losses) on hedges of net investments in foreign operations, net of tax" } }, "en": { "role": { "documentation": "The gains (losses) recognised in other comprehensive income on hedges of net investments in foreign operations, net of tax, before reclassification adjustments. [Refer: Other comprehensive income]" } } }, "auth_ref": [ "r35", "r129", "r131", "r169", "r233", "r294" ] }, "ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementAssets", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Change in fair value included in other comprehensive income", "label": "Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, assets" } }, "en": { "role": { "documentation": "The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]" } } }, "auth_ref": [ "r75", "r244" ] }, "ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementEntitysOwnEquityInstruments": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementEntitysOwnEquityInstruments", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "verboseLabel": "Unrealized gains (losses) on fair value through OCI equity securities arising during the period", "label": "Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, entity's own equity instruments" } }, "en": { "role": { "documentation": "The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of the entity's own equity instruments. [Refer: At fair value [member]; Other comprehensive income]" } } }, "auth_ref": [ "r75", "r244" ] }, "ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementLiabilities", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Change in fair value included in other comprehensive income", "label": "Gains (losses) recognised in other comprehensive income including exchange differences, fair value measurement, liabilities" } }, "en": { "role": { "documentation": "The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of liabilities. [Refer: At fair value [member]; Other comprehensive income]" } } }, "auth_ref": [ "r75", "r244" ] }, "ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Change in unrealized gains (losses) recorded in income for instruments still held", "label": "Gains (losses) recognised in profit or loss attributable to change in unrealised gains or losses for assets held at end of period, fair value measurement" } }, "en": { "role": { "documentation": "The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r79" ] }, "ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForLiabilitiesHeldAtEndOfPeriodFairValueMeasurement": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForLiabilitiesHeldAtEndOfPeriodFairValueMeasurement", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Change in unrealized gains (losses) recorded in income for instruments still held", "label": "Gains (losses) recognised in profit or loss attributable to change in unrealised gains or losses for liabilities held at end of period, fair value measurement" } }, "en": { "role": { "documentation": "The gains (losses) recognised in profit or loss for liabilities measured at fair value that are attributable to the change in unrealised gains or losses relating to those liabilities held at the end of the reporting period. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r79" ] }, "ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Change in fair value included in earnings", "label": "Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, assets" } }, "en": { "role": { "documentation": "The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of assets. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r74", "r243" ] }, "ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Change in fair value included in earnings", "label": "Gains (losses) recognised in profit or loss including exchange differences, fair value measurement, liabilities" } }, "en": { "role": { "documentation": "The gains (losses) including exchange differences recognised in profit or loss on the fair value measurement of liabilities. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r74", "r243" ] }, "ifrs-full_GeographicalAreasAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GeographicalAreasAxis", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Geographical areas [axis]", "label": "Geographical areas [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r166", "r298", "r312", "r315", "r339" ] }, "ifrs-full_GeographicalAreasDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GeographicalAreasDomain", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Geographical areas [domain]", "label": "Geographical areas [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregated geographical areas. It also represents the standard value for the 'Geographical areas' axis if no other member is used." } } }, "auth_ref": [ "r166", "r298", "r312", "r315", "r339" ] }, "ifrs-full_Goodwill": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "Goodwill", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Goodwill", "label": "Goodwill" } }, "en": { "role": { "documentation": "The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Total for all business combinations [member]]" } } }, "auth_ref": [ "r28", "r30", "r123", "r204", "r206", "r225", "r264" ] }, "ifrs-full_GoodwillRecognisedAsOfAcquisitionDate": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GoodwillRecognisedAsOfAcquisitionDate", "crdr": "debit", "calculation": { "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails": { "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails", "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Goodwill", "label": "Goodwill recognised as of acquisition date" } }, "en": { "role": { "documentation": "The amount recognised as of the business combination's acquisition date for goodwill. [Refer: Goodwill; Total for all business combinations [member]]" } } }, "auth_ref": [ "r318", "r319", "r343" ] }, "bmo_GovernmentPensionPlansExpense": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "GovernmentPensionPlansExpense", "crdr": "debit", "calculation": { "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails": { "parentTag": "bmo_PensionAndOtherEmployeeFutureBenefitExpensesRecovery", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Government pension plans expense", "label": "Government Pension Plans Expense", "documentation": "Government pension plans expense." } } }, "auth_ref": [] }, "ifrs-full_GrossCarryingAmountMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "GrossCarryingAmountMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Gross carrying amount", "label": "Gross carrying amount [member]" } } }, "auth_ref": [ "r7", "r32", "r38", "r41", "r123", "r135", "r137", "r194", "r208", "r212", "r215", "r237", "r238", "r323" ] }, "bmo_GrossCommitmentsAndFinancialGuaranteeContractsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "GrossCommitmentsAndFinancialGuaranteeContractsMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Gross commitments and financial guarantee contracts", "label": "Gross Commitments and Financial Guarantee Contracts [Member]", "documentation": "Gross commitments and financial guarantee contracts." } } }, "auth_ref": [] }, "bmo_GrossTotalLoansAndAcceptancesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "GrossTotalLoansAndAcceptancesMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total gross loans and acceptances", "label": "Gross Total Loans And Acceptances [Member]", "documentation": "Gross total loans and acceptances." } } }, "auth_ref": [] }, "bmo_GrossUnrealizedGainsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "GrossUnrealizedGainsMember", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Gross unrealized gains", "label": "Gross Unrealized Gains [Member]", "documentation": "Gross unrealized gains." } } }, "auth_ref": [] }, "bmo_GrossUnrealizedLossesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "GrossUnrealizedLossesMember", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Gross unrealized losses", "label": "Gross Unrealized Losses [Member]", "documentation": "Gross unrealized losses." } } }, "auth_ref": [] }, "bmo_HighProbabilityOfDefaultMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "HighProbabilityOfDefaultMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "High", "label": "High probability of default [member]", "documentation": "High probability of default." } } }, "auth_ref": [] }, "bmo_HousingPriceIndex": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "HousingPriceIndex", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Housing Price Index", "label": "Housing price index", "documentation": "Housing price index." } } }, "auth_ref": [] }, "ifrs-full_IFRS9Member": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IFRS9Member", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "IFRS9", "label": "IFRS 9 [member]" } }, "en": { "role": { "documentation": "This member stands for IFRS 9 Financial Instruments." } } }, "auth_ref": [ "r363", "r366", "r367", "r368", "r369", "r370", "r371", "r372" ] }, "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IdentifiableAssetsAcquiredLiabilitiesAssumed", "crdr": "debit", "calculation": { "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Purchase price", "label": "Identifiable assets acquired (liabilities assumed)" } }, "en": { "role": { "documentation": "The amount recognised as of the acquisition date for net identifiable assets acquired or liabilities assumed in a business combination. [Refer: Total for all business combinations [member]]" } } }, "auth_ref": [ "r317", "r319", "r342" ] }, "bmo_IdentifiableAssetsAcquiredRecognisedAsOfAcquisitionDate": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IdentifiableAssetsAcquiredRecognisedAsOfAcquisitionDate", "crdr": "debit", "calculation": { "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails": { "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Total assets", "label": "Identifiable Assets Acquired Recognised As Of Acquisition Date", "documentation": "Identifiable Assets Acquired Recognised As Of Acquisition Date" } } }, "auth_ref": [] }, "ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate", "crdr": "debit", "calculation": { "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails": { "parentTag": "bmo_IdentifiableAssetsAcquiredRecognisedAsOfAcquisitionDate", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails", "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Customer relationship intangible assets", "label": "Identifiable intangible assets recognised as of acquisition date" } }, "en": { "role": { "documentation": "The amount recognised as of the acquisition date for identifiable intangible assets acquired in a business combination. [Refer: Intangible assets other than goodwill; Total for all business combinations [member]]" } } }, "auth_ref": [ "r317", "r319", "r342" ] }, "bmo_ImpairedLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ImpairedLoansMember", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Provision for credit losses on impaired loans", "label": "Impaired loans [Member]", "documentation": "Impaired loans member." } } }, "auth_ref": [] }, "ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndGoodwill", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Impairment loss recognised in profit or loss, intangible assets and goodwill", "label": "Impairment loss recognised in profit or loss, intangible assets and goodwill" } } }, "auth_ref": [ "r358" ] }, "bmo_ImpairmentLossRecoveryOnFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAndAmortizedCostSecurities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ImpairmentLossRecoveryOnFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAndAmortizedCostSecurities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails": { "parentTag": "bmo_SecuritiesGainsOtherThanTrading", "weight": -1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Impairment on FVOCI and amortized cost securities", "label": "Impairment Loss Recovery On Financial Assets At Fair Value Through Other Comprehensive Income And Amortized Cost Securities", "documentation": "Impairment loss recovery on financial assets at fair value through other comprehensive income and amortized cost securities." } } }, "auth_ref": [] }, "ifrs-full_ImpairmentOfFinancialAssetsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ImpairmentOfFinancialAssetsAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Impairment of financial assets [axis]", "label": "Impairment of financial assets [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r252" ] }, "ifrs-full_ImpairmentOfFinancialAssetsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ImpairmentOfFinancialAssetsDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Impairment of financial assets [domain]", "label": "Impairment of financial assets [domain]" } }, "en": { "role": { "documentation": "This member stands for the standard value for the 'Impairment of financial assets' axis if no other member is used." } } }, "auth_ref": [ "r252" ] }, "bmo_IncomeExpenseDueToChangesInInvestmentContractLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncomeExpenseDueToChangesInInvestmentContractLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails": { "parentTag": "bmo_InsuranceInvestmentResult", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Movement in investment contract liabilities", "label": "Income Expense Due To Changes In Investment Contract Liabilities", "documentation": "Income expense due to changes in investment contract liabilities." } } }, "auth_ref": [] }, "ifrs-full_IncomeExpensesFromReinsuranceContractsHeldOtherThanFinanceIncomeExpenses": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeExpensesFromReinsuranceContractsHeldOtherThanFinanceIncomeExpenses", "crdr": "credit", "calculation": { "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails": { "parentTag": "ifrs-full_InsuranceServiceResult", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Net expenses from reinsurance contracts", "label": "Income (expenses) from reinsurance contracts held, other than finance income (expenses)" } } }, "auth_ref": [ "r106", "r290" ] }, "ifrs-full_IncomeStatementAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeStatementAbstract", "lang": { "en-us": { "role": { "terseLabel": "Profit or loss [abstract]", "label": "Profit or loss [abstract]" } } }, "auth_ref": [] }, "ifrs-full_IncomeTaxExpenseContinuingOperations": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeTaxExpenseContinuingOperations", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_ProfitLoss", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Provision for income taxes (Note 11)", "verboseLabel": "Provision for (recovery of) income taxes", "label": "Tax expense (income)" } } }, "auth_ref": [ "r1", "r3", "r4", "r14", "r69", "r156", "r190", "r191", "r192", "r292" ] }, "ifrs-full_IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "negatedLabel": "Net of income tax (provision) recovery, gains (losses) on derivatives designated as cash flow hedges", "label": "Income tax relating to cash flow hedges included in other comprehensive income" } }, "en": { "role": { "documentation": "The amount of income tax relating to amounts recognised in other comprehensive income in relation to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]" } } }, "auth_ref": [ "r2", "r293" ] }, "ifrs-full_IncomeTaxRelatingToChangesInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiabilityOfOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeTaxRelatingToChangesInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiabilityOfOtherComprehensiveIncome", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "negatedLabel": "Net of income tax (provision) recovery, net gains (losses) on remeasurement of own credit risk on financial liabilities designated at fair value", "label": "Income tax relating to changes in fair value of financial liability attributable to change in credit risk of liability included in other comprehensive income" } }, "en": { "role": { "documentation": "The amount of income tax relating to amounts recognised in other comprehensive income in relation to changes in the fair value of financial liabilities attributable to a change in the credit risk of those liabilities. [Refer: Credit risk [member]; Other comprehensive income]" } } }, "auth_ref": [ "r2", "r293" ] }, "ifrs-full_IncomeTaxRelatingToFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeTaxRelatingToFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "negatedLabel": "Net of income tax (provision) recovery of unrealized gains (losses) on fair value through OCI debt securities", "label": "Income tax relating to financial assets measured at fair value through other comprehensive income included in other comprehensive income" } }, "en": { "role": { "documentation": "The amount of income tax relating to amounts recognised in other comprehensive income in relation to financial assets measured at fair value through other comprehensive income applying paragraph 4.1.2A of IFRS 9. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]" } } }, "auth_ref": [ "r2", "r293" ] }, "ifrs-full_IncomeTaxRelatingToHedgesOfNetInvestmentsInForeignOperationsOfOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeTaxRelatingToHedgesOfNetInvestmentsInForeignOperationsOfOtherComprehensiveIncome", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "negatedLabel": "Net of income tax (provision) recovery, unrealized (losses) on hedges of net foreign operations", "label": "Income tax relating to hedges of net investments in foreign operations included in other comprehensive income" } }, "en": { "role": { "documentation": "The amount of income tax relating to amounts recognised in other comprehensive income in relation to hedges of net investments in foreign operations. [Refer: Other comprehensive income]" } } }, "auth_ref": [ "r2", "r293" ] }, "ifrs-full_IncomeTaxRelatingToInvestmentsInEquityInstrumentsOfOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeTaxRelatingToInvestmentsInEquityInstrumentsOfOtherComprehensiveIncome", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "negatedLabel": "Net of income tax (provision) recovery, net gains (losses) on remeasurement of pension and other employee future benefit plans", "label": "Income tax relating to investments in equity instruments included in other comprehensive income" } }, "en": { "role": { "documentation": "The amount of income tax relating to amounts recognised in other comprehensive income in relation to investments in equity instruments that the entity has designated at fair value through other comprehensive income applying paragraph 5.7.5 of IFRS 9. [Refer: Other comprehensive income; Reserve of gains and losses from investments in equity instruments]" } } }, "auth_ref": [ "r2", "r293" ] }, "bmo_IncomeTaxRelatingToReclassificationToEarningsOnCashFlowHedgesOfOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncomeTaxRelatingToReclassificationToEarningsOnCashFlowHedgesOfOtherComprehensiveIncome", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "terseLabel": "Net of income tax (recovery), reclassification to earnings of losses on derivatives designated as cash flow hedges", "label": "Income Tax Relating To Reclassification To Earnings On Cash Flow Hedges Of Other Comprehensive Income", "documentation": "The amount of income tax relating to amounts recognised in other comprehensive income in relation to reclassification to earnings of (gains) losses on cash flow hedges." } } }, "auth_ref": [] }, "bmo_IncomeTaxRelatingToReclassificationToEarningsOnFairValueThroughOtherComprehensiveIncomeSecurities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncomeTaxRelatingToReclassificationToEarningsOnFairValueThroughOtherComprehensiveIncomeSecurities", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "terseLabel": "Net of income tax provision, reclassification to earnings of (gains)", "label": "Income Tax Relating To Reclassification To Earnings On Fair Value Through Other Comprehensive Income Securities", "documentation": "Income tax relating to reclassification to earnings on fair value through other\u200b comprehensive\u200b income securities." } } }, "auth_ref": [] }, "ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "negatedLabel": "Net of income tax (provision) recovery, net unrealized gains (losses) on fair value through OCI equity securities", "label": "Income tax relating to remeasurements of defined benefit plans included in other comprehensive income" } }, "en": { "role": { "documentation": "The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [domain]]" } } }, "auth_ref": [ "r2", "r293" ] }, "ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncomeTaxesPaidRefundClassifiedAsOperatingActivities", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Income taxes paid in the period", "label": "Income taxes paid (refund), classified as operating activities" } }, "en": { "role": { "documentation": "The cash flows from income taxes paid or refunded, classified as operating activities. [Refer: Income taxes paid (refund)]" } } }, "auth_ref": [ "r46", "r302" ] }, "bmo_IncreaseDecreaseInAllowanceAccountForCreditLossesOfLoans": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncreaseDecreaseInAllowanceAccountForCreditLossesOfLoans", "crdr": "credit", "calculation": { "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails": { "parentTag": "ifrs-full_ProfitLossBeforeTax", "weight": 1.0, "order": 2.0 }, "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_ProfitLossBeforeTax", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Provision for Credit Losses (Note 3)", "negatedLabel": "Total provision for credit losses", "label": "Increase Decrease In Allowance Account For Credit Losses Of Loans", "documentation": "Increase (decrease) in allowance account for credit losses of loans." } } }, "auth_ref": [] }, "ifrs-full_IncreaseDecreaseInCashAndCashEquivalents": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseInCashAndCashEquivalents", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "totalLabel": "Net increase (decrease) in Cash and Cash Equivalents", "label": "Increase (decrease) in cash and cash equivalents after effect of exchange rate changes" } }, "en": { "role": { "documentation": "The increase (decrease) in cash and cash equivalents after the effect of exchange rate changes on cash and cash equivalents held in foreign currencies. [Refer: Cash and cash equivalents; Effect of exchange rate changes on cash and cash equivalents]" } } }, "auth_ref": [ "r50", "r187" ] }, "ifrs-full_IncreaseDecreaseInContingentLiabilitiesRecognisedInBusinessCombination": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseInContingentLiabilitiesRecognisedInBusinessCombination", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Increase in contingent liabilities recognised in business combination", "label": "Increase (decrease) in contingent liabilities recognised in business combination" } }, "en": { "role": { "documentation": "The increase (decrease) in contingent liabilities recognised in a business combination. [Refer: Contingent liabilities recognised in business combination; Total for all business combinations [member]; Classes of contingent liabilities [domain]]" } } }, "auth_ref": [ "r122" ] }, "bmo_IncreaseDecreaseInLiabilitiesOfSubsidiaries": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncreaseDecreaseInLiabilitiesOfSubsidiaries", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Net increase (decrease) in liabilities of subsidiaries", "label": "Increase decrease in liabilities of subsidiaries", "documentation": "The increase (decrease) in the liabilities held by subsidiaries." } } }, "auth_ref": [] }, "ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughAcquisitionOfSubsidiary", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Issued for acquisition (Note 13)", "verboseLabel": "Value of shares issued in an acquisition", "label": "Increase (decrease) through acquisition of subsidiary, equity" } }, "en": { "role": { "documentation": "The increase (decrease) in equity resulting from the acquisition of subsidiaries. [Refer: Total for all subsidiaries [member]]" } } }, "auth_ref": [ "r374" ] }, "ifrs-full_IncreaseDecreaseThroughAdditionalItemsNecessaryToUnderstandChangeInsuranceContractsLiabilityAsset": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughAdditionalItemsNecessaryToUnderstandChangeInsuranceContractsLiabilityAsset", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other changes in the net carrying amount of the insurance contract", "label": "Increase (decrease) through additional items necessary to understand change, insurance contracts liability (asset)" } }, "en": { "role": { "documentation": "The increase (decrease) in insurance contracts liability (asset) resulting from additional items that may be necessary to understand the change in the net carrying amount of the insurance contracts. [Refer: Insurance contracts liability (asset)]" } } }, "auth_ref": [ "r95" ] }, "ifrs-full_IncreaseDecreaseThroughCashFlowsInsuranceContractsLiabilityAsset": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughCashFlowsInsuranceContractsLiabilityAsset", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total cash flows", "label": "Increase (decrease) through cash flows, insurance contracts liability (asset)" } }, "en": { "role": { "documentation": "The increase (decrease) in insurance contracts liability (asset) resulting from cash flows. [Refer: Insurance contracts liability (asset)]" } } }, "auth_ref": [ "r93" ] }, "bmo_IncreaseDecreaseThroughCommonSharesRepurchasedForCancellation": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncreaseDecreaseThroughCommonSharesRepurchasedForCancellation", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "negatedLabel": "Common shares purchased for cancellation (Note 6)", "label": "Increase Decrease Through Common Shares Repurchased For Cancellation", "documentation": "Increase Decrease Through Common Shares Repurchased For Cancellation." } } }, "auth_ref": [] }, "bmo_IncreaseDecreaseThroughDividendsAndDistributionsOnOtherEquityInRetainedEarnings": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncreaseDecreaseThroughDividendsAndDistributionsOnOtherEquityInRetainedEarnings", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "negatedLabel": "Dividends on preferred shares and distributions payable on other equity instruments", "label": "Increase Decrease Through Dividends And Distributions On Other Equity In Retained Earnings", "documentation": "Increase decrease through dividends and distributions on other equity in retained earnings." } } }, "auth_ref": [] }, "ifrs-full_IncreaseDecreaseThroughExerciseOfOptions": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughExerciseOfOptions", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Stock option expense, net of options exercised", "label": "Increase (decrease) through exercise of options, equity" } }, "en": { "role": { "documentation": "The increase (decrease) in equity resulting from the exercise of options." } } }, "auth_ref": [ "r374" ] }, "ifrs-full_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughForeignExchangeAndOtherMovementsFinancialAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Foreign exchange and other", "label": "Increase (decrease) through foreign exchange and other movements, financial assets" } }, "en": { "role": { "documentation": "The increase (decrease) in financial assets resulting from foreign exchange and other movements. [Refer: Financial assets]" } } }, "auth_ref": [ "r320", "r331", "r344" ] }, "ifrs-full_IncreaseDecreaseThroughInsuranceFinanceIncomeOrExpensesInsuranceContractsLiabilityAsset": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughInsuranceFinanceIncomeOrExpensesInsuranceContractsLiabilityAsset", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Net finance expenses (income) from insurance contracts", "label": "Increase (decrease) through insurance finance income or expenses, insurance contracts liability (asset)" } } }, "auth_ref": [ "r94" ] }, "ifrs-full_IncreaseDecreaseThroughInsuranceServiceResultInsuranceContractsLiabilityAsset": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughInsuranceServiceResultInsuranceContractsLiabilityAsset", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance service results", "label": "Increase (decrease) through insurance service result, insurance contracts liability (asset)" } } }, "auth_ref": [ "r91", "r92" ] }, "bmo_IncreaseDecreaseThroughRepurchasedForCancellation": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncreaseDecreaseThroughRepurchasedForCancellation", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "negatedLabel": "Purchased for cancellation", "label": "Increase Decrease Through Repurchased For Cancellation", "documentation": "Increase Decrease Through Repurchased For Cancellation." } } }, "auth_ref": [] }, "ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughSharebasedPaymentTransactions", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Issued under the Stock Option Plan", "label": "Increase (decrease) through share-based payment transactions, equity" } }, "en": { "role": { "documentation": "The increase (decrease) in equity resulting from share-based payment transactions. [Refer: Equity]" } } }, "auth_ref": [ "r258" ] }, "ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IncreaseDecreaseThroughTransfersAndOtherChangesEquity", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Other", "label": "Increase (decrease) through other changes, equity" } }, "en": { "role": { "documentation": "The increase (decrease) in equity resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Equity]" } } }, "auth_ref": [ "r259" ] }, "bmo_IncreaseInProfitOrLossFromFiftyBasisPointIncreaseInInterestRates": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncreaseInProfitOrLossFromFiftyBasisPointIncreaseInInterestRates", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceSensitivityAnalysisDetails" ], "lang": { "en-us": { "role": { "terseLabel": "50 basis point increase", "label": "Increase In Profit Or Loss From Fifty Basis Point Increase In Interest Rates", "documentation": "Increase In Profit Or Loss From Fifty Basis Point Increase In Interest Rates" } } }, "auth_ref": [] }, "bmo_IncreaseInProfitOrLossFromTenPercentIncreaseInEquityPrices": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "IncreaseInProfitOrLossFromTenPercentIncreaseInEquityPrices", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceSensitivityAnalysisDetails" ], "lang": { "en-us": { "role": { "terseLabel": "10% increase", "label": "Increase In Profit Or Loss From Ten Percent Increase In Equity Prices", "documentation": "Increase In Profit Or Loss From Ten Percent Increase In Equity Prices" } } }, "auth_ref": [] }, "ifrs-full_InitiallyAppliedIFRSsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InitiallyAppliedIFRSsAxis", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Loans: Business and government", "label": "Initially applied IFRSs [axis]" } } }, "auth_ref": [ "r52", "r188" ] }, "ifrs-full_InitiallyAppliedIFRSsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InitiallyAppliedIFRSsDomain", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Initially applied IFRSs [domain]", "label": "Initially applied IFRSs [domain]" } } }, "auth_ref": [ "r52", "r188" ] }, "ifrs-full_InsuranceContractsByRemainingCoverageAndIncurredClaimsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceContractsByRemainingCoverageAndIncurredClaimsAxis", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance contracts by remaining coverage and incurred claims [axis]", "label": "Insurance contracts by remaining coverage and incurred claims [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r90" ] }, "ifrs-full_InsuranceContractsByRemainingCoverageAndIncurredClaimsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceContractsByRemainingCoverageAndIncurredClaimsDomain", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance contracts by remaining coverage and incurred claims [domain]", "label": "Insurance contracts by remaining coverage and incurred claims [domain]" } }, "en": { "role": { "documentation": "This member stands for all insurance contracts when disaggregated by remaining coverage and incurred claims. This member also represents the standard value for the 'Insurance contracts by remaining coverage and incurred claims' axis if no other member is used. [Refer: Insurance contracts [domain]]" } } }, "auth_ref": [ "r90" ] }, "ifrs-full_InsuranceContractsIssuedMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceContractsIssuedMember", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance contracts issued", "label": "Insurance contracts issued [member]" } }, "en": { "role": { "documentation": "This member stands for insurance contracts issued. [Refer: Insurance contracts [domain]]" } } }, "auth_ref": [ "r97", "r98", "r103", "r104", "r107" ] }, "ifrs-full_InsuranceContractsLiabilityAsset": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceContractsLiabilityAsset", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "periodStartLabel": "Insurance contract liabilities, beginning of period", "periodEndLabel": "Insurance contract liabilities, end of period", "label": "Insurance contracts liability (asset)" } }, "en": { "role": { "documentation": "The amount of insurance contracts liability (asset). [Refer: Assets; Liabilities; Insurance contracts [domain]]" } } }, "auth_ref": [ "r108" ] }, "ifrs-full_InsuranceContractsThatAreLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceContractsThatAreLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousLiabilities", "weight": 1.0, "order": 6.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "verboseLabel": "Insurance-related liabilities (Note 5)", "label": "Insurance contracts that are liabilities" } }, "en": { "role": { "documentation": "The amount of insurance contracts that are liabilities. [Refer: Liabilities; Insurance contracts [domain]]" } } }, "auth_ref": [ "r108" ] }, "bmo_InsuranceFinanceIncomeExpensesFromInsuranceAndReinsuranceContractsHeld": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InsuranceFinanceIncomeExpensesFromInsuranceAndReinsuranceContractsHeld", "crdr": "credit", "calculation": { "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails": { "parentTag": "bmo_InsuranceInvestmentResult", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance finance income (expense) from insurance and reinsurance contracts held", "label": "Insurance Finance Income Expenses From Insurance And Reinsurance Contracts Held", "documentation": "Insurance finance income expenses from insurance and reinsurance contracts held." } } }, "auth_ref": [] }, "bmo_InsuranceInvestmentResult": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InsuranceInvestmentResult", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 13.0 }, "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance investment results (Notes 2 and 5)", "totalLabel": "Insurance investment results", "label": "Insurance Investment Results", "documentation": "Insurance investment result." } } }, "auth_ref": [] }, "bmo_InsuranceInvestmentReturn": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InsuranceInvestmentReturn", "crdr": "credit", "calculation": { "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails": { "parentTag": "bmo_InsuranceInvestmentResult", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofInsuranceInvestmentResultsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Investment return", "label": "Insurance Investment Return", "documentation": "Insurance investment return." } } }, "auth_ref": [] }, "bmo_InsuranceProductsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InsuranceProductsMember", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance products", "label": "Insurance Products [Member]", "documentation": "Insurance Products [Member]" } } }, "auth_ref": [] }, "ifrs-full_InsuranceRevenue": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceRevenue", "crdr": "credit", "calculation": { "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails": { "parentTag": "ifrs-full_InsuranceServiceResult", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance revenue", "label": "Insurance revenue" } } }, "auth_ref": [ "r96", "r105", "r287" ] }, "ifrs-full_InsuranceServiceExpensesFromInsuranceContractsIssued": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceServiceExpensesFromInsuranceContractsIssued", "crdr": "debit", "calculation": { "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails": { "parentTag": "ifrs-full_InsuranceServiceResult", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Insurance service expenses", "label": "Insurance service expenses from insurance contracts issued" } } }, "auth_ref": [ "r105", "r289" ] }, "ifrs-full_InsuranceServiceResult": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceServiceResult", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 14.0 }, "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/InsuranceSummaryofInsuranceServiceResultsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Insurance service results (Note 5)", "totalLabel": "Insurance service results", "label": "Insurance service result" } } }, "auth_ref": [ "r105" ] }, "ifrs-full_InsuranceServiceResultAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InsuranceServiceResultAbstract", "lang": { "en-us": { "role": { "terseLabel": "Insurance service result [abstract]", "label": "Insurance service result [abstract]" } } }, "auth_ref": [] }, "ifrs-full_IntangibleAssetsOtherThanGoodwill": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IntangibleAssetsOtherThanGoodwill", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Intangible assets", "label": "Intangible assets other than goodwill" } }, "en": { "role": { "documentation": "The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]" } } }, "auth_ref": [ "r34", "r210", "r264" ] }, "bmo_InterestAndDividendIncomeAndGainLossesOnFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestAndDividendIncomeAndGainLossesOnFinancialAssets", "crdr": "credit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Total interest and dividend income and gains held in our Insurance business", "label": "Interest And Dividend Income And Gain Losses On Financial Assets", "documentation": "Interest and dividend income and gain losses on financial assets." } } }, "auth_ref": [] }, "bmo_InterestDividendAndFeeIncome": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestDividendAndFeeIncome", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestIncomeCalculatedUsingEffectiveInterestMethodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total", "label": "Interest Dividend and Fee Income", "documentation": "Interest, dividend and fee income." } } }, "auth_ref": [] }, "ifrs-full_InterestExpense": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestExpense", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_InterestIncomeExpenseNet1", "weight": -1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Interest Expense", "terseLabel": "Interest expense for liabilities", "label": "Interest expense" } }, "en": { "role": { "documentation": "The amount of expense arising from interest." } } }, "auth_ref": [ "r68", "r154", "r162" ] }, "bmo_InterestExpense1Abstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestExpense1Abstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Interest Expense", "label": "Interest expense 1 [abstract]", "documentation": "Interest expense 1." } } }, "auth_ref": [] }, "bmo_InterestExpenseForLiabilitiesCarriedAtAmortizedCostMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestExpenseForLiabilitiesCarriedAtAmortizedCostMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Interest expense for liabilities carried at amortized cost", "label": "Interest Expense for Liabilities Carried at Amortized Cost [Member]", "documentation": "Interest Expense for Liabilities Carried at Amortized Cost [Member]" } } }, "auth_ref": [] }, "bmo_InterestExpenseForLiabilitiesCarriedAtFairValueMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestExpenseForLiabilitiesCarriedAtFairValueMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Interest expense for liabilities carried at fair value", "label": "Interest Expense for Liabilities Carried at Fair Value [Member]", "documentation": "Interest Expense for Liabilities Carried at Fair Value [Member]" } } }, "auth_ref": [] }, "ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestExpenseIncomeNetDefinedBenefitLiabilityAsset", "crdr": "credit", "calculation": { "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails": { "parentTag": "bmo_PostemploymentBenefitExpense", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Net interest (income) expense", "terseLabel": "Net interest (income) expense", "label": "Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)" } } }, "auth_ref": [ "r10", "r198" ] }, "bmo_InterestExpenseOnDeposits": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestExpenseOnDeposits", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_InterestExpense", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits", "label": "Interest Expense on Deposits", "documentation": "Interest Expense on Deposits" } } }, "auth_ref": [] }, "ifrs-full_InterestExpenseOnOtherFinancialLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestExpenseOnOtherFinancialLiabilities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_InterestExpense", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Other liabilities", "label": "Interest expense on other financial liabilities" } } }, "auth_ref": [ "r376" ] }, "bmo_InterestExpenseOnSecuritiesSoldButNotYetRepurchasedAndSecuritiesLentOrSoldUnderRepurchaseAgreements": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestExpenseOnSecuritiesSoldButNotYetRepurchasedAndSecuritiesLentOrSoldUnderRepurchaseAgreements", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_InterestExpense", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Securities sold but not yet purchased and securities lent or sold under repurchase agreements", "label": "Interest Expense On Securities Sold But Not Yet Repurchased And Securities Lent Or Sold Under Repurchase Agreements", "documentation": "Interest expense on securities sold but not yet repurchased and securities lent or sold under repurchase agreements." } } }, "auth_ref": [] }, "bmo_InterestExpenseOnSubordinatedDebtInstruments": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestExpenseOnSubordinatedDebtInstruments", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_InterestExpense", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Subordinated debt", "label": "Interest Expense On Subordinated Debt Instruments", "documentation": "Interest expense on subordinated debt instruments." } } }, "auth_ref": [] }, "bmo_InterestIncome1Abstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestIncome1Abstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Interest, Dividend and Fee Income", "label": "Interest income1 [Abstract]", "documentation": "Interest income [abstract]" } } }, "auth_ref": [] }, "bmo_InterestIncomeExpenseNet1": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestIncomeExpenseNet1", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_Revenue", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Net Interest Income", "label": "Interest income expense net1", "documentation": "Interest income (expense), net" } } }, "auth_ref": [] }, "ifrs-full_InterestIncomeOnDeposits": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestIncomeOnDeposits", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_RevenueFromInterest", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Deposits with banks", "label": "Interest income on deposits" } } }, "auth_ref": [ "r376" ] }, "ifrs-full_InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss", "crdr": "credit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails": { "parentTag": "bmo_InterestAndDividendIncomeAndGainLossesOnFinancialAssets", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Interest and dividend income", "label": "Interest income on financial assets designated at fair value through profit or loss" } } }, "auth_ref": [ "r376" ] }, "ifrs-full_InterestIncomeOnLoansAndAdvancesToCustomers": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestIncomeOnLoansAndAdvancesToCustomers", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_RevenueFromInterest", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Loans", "label": "Interest income on loans and advances to customers" } } }, "auth_ref": [ "r376" ] }, "bmo_InterestIncomeOnSecurities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestIncomeOnSecurities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_RevenueFromInterest", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Securities (Note 2)", "label": "Interest income on securities", "documentation": "Income on securities." } } }, "auth_ref": [] }, "bmo_InterestIncomeOnSecuritiesBorrowedOrPurchasedUnderResaleAgreement": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestIncomeOnSecuritiesBorrowedOrPurchasedUnderResaleAgreement", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_RevenueFromInterest", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Securities borrowed or purchased under resale agreements", "label": "Interest Income On Securities Borrowed Or Purchased Under Resale Agreement", "documentation": "Interest income on securities borrowed or purchased under resale agreements." } } }, "auth_ref": [] }, "bmo_InterestMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Interest", "label": "Interest [Member]", "documentation": "Interest [Member]" } } }, "auth_ref": [] }, "bmo_InterestOfTradeSecuritiesInCollateralizedMortgageObligations": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestOfTradeSecuritiesInCollateralizedMortgageObligations", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Interest of trade securities in collateralized mortgage obligations", "label": "Interest Of Trade Securities In Collateralized Mortgage Obligations", "documentation": "Interest of trade securities in collateralized mortgage obligations." } } }, "auth_ref": [] }, "ifrs-full_InterestPaidClassifiedAsOperatingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestPaidClassifiedAsOperatingActivities", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Interest paid in the period", "label": "Interest paid, classified as operating activities" } }, "en": { "role": { "documentation": "The cash outflow for interest paid, classified as operating activities." } } }, "auth_ref": [ "r45" ] }, "bmo_InterestRateContractsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InterestRateContractsMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Interest rate contracts", "label": "Interest Rate Contracts [member]", "documentation": "Interest rate contracts." } } }, "auth_ref": [] }, "ifrs-full_InterestReceivedClassifiedAsOperatingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestReceivedClassifiedAsOperatingActivities", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Interest received in the period", "label": "Interest received, classified as operating activities" } }, "en": { "role": { "documentation": "The cash inflow from interest received, classified as operating activities." } } }, "auth_ref": [ "r45" ] }, "ifrs-full_InterestRevenueExpense": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InterestRevenueExpense", "crdr": "credit", "calculation": { "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails": { "parentTag": "ifrs-full_Revenue", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Net interest income", "label": "Interest income (expense)" } } }, "auth_ref": [ "r157", "r162", "r379" ] }, "ifrs-full_InternalCreditGradesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InternalCreditGradesAxis", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Internal credit grades [axis]", "terseLabel": "Internal credit grades [axis]", "label": "Internal credit grades [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r322", "r332", "r346" ] }, "ifrs-full_InternalCreditGradesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "InternalCreditGradesDomain", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Internal credit grades [domain]", "label": "Internal credit grades [domain]" } }, "en": { "role": { "documentation": "This member stands for the standard value for the 'Internal credit grades' axis if no other member is used." } } }, "auth_ref": [ "r322", "r332", "r346" ] }, "bmo_InvestmentGradeMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "InvestmentGradeMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Investment grade", "label": "Investment grade [Member]", "documentation": "Investment grade." } } }, "auth_ref": [] }, "ifrs-full_IssuedCapital": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "IssuedCapital", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_EquityAttributableToOwnersOfParent", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "verboseLabel": "Issued capital", "label": "Issued capital" } }, "en": { "role": { "documentation": "The nominal value of capital issued." } } }, "auth_ref": [ "r347", "r351" ] }, "ifrs-full_LaterThanFiveYearsAndNotLaterThanTenYearsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LaterThanFiveYearsAndNotLaterThanTenYearsMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "10 years", "label": "Later than five years and not later than ten years [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of later than five years and not later than ten years." } } }, "auth_ref": [ "r326", "r334", "r376" ] }, "ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LaterThanFourYearsAndNotLaterThanFiveYearsMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "5 years", "label": "Later than four years and not later than five years [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of later than four years and not later than five years." } } }, "auth_ref": [ "r86", "r87", "r104", "r326", "r334", "r376" ] }, "ifrs-full_LaterThanOneMonthAndNotLaterThanThreeMonthsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LaterThanOneMonthAndNotLaterThanThreeMonthsMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "30 to 89 days", "label": "Later than one month and not later than three months [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of later than one month and not later than three months." } } }, "auth_ref": [ "r325", "r327", "r334" ] }, "ifrs-full_LaterThanOneYearMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LaterThanOneYearMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Over 12 months", "label": "Later than one year [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of later than one year." } } }, "auth_ref": [ "r273" ] }, "ifrs-full_LaterThanSixMonthsAndNotLaterThanOneYearMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LaterThanSixMonthsAndNotLaterThanOneYearMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "6 to 12 months", "label": "Later than six months and not later than one year [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of later than six months and not later than one year." } } }, "auth_ref": [ "r326", "r329", "r334" ] }, "bmo_LaterThanTenYearsAndNotLaterThanTwentyYearsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LaterThanTenYearsAndNotLaterThanTwentyYearsMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "20 years", "label": "Later than ten years and not later than twenty years [Member]", "documentation": "Later than ten years and not later than twenty years." } } }, "auth_ref": [] }, "ifrs-full_LaterThanThreeMonthsAndNotLaterThanSixMonthsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LaterThanThreeMonthsAndNotLaterThanSixMonthsMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "3 to 6 months", "label": "Later than three months and not later than six months [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of later than three months and not later than six months." } } }, "auth_ref": [ "r326", "r328", "r334" ] }, "ifrs-full_LaterThanThreeMonthsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LaterThanThreeMonthsMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "90 days or more", "label": "Later than three months [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of later than three months." } } }, "auth_ref": [ "r323", "r333" ] }, "bmo_LaterThanTwentyYearsAndNotLaterThanThirtyYearsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LaterThanTwentyYearsAndNotLaterThanThirtyYearsMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "30 years", "label": "Later Than Twenty Years And Not Later Than Thirty Years [Member]", "documentation": "Later than twenty years and not later than thirty years." } } }, "auth_ref": [] }, "ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LaterThanTwoYearsAndNotLaterThanThreeYearsMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "3 years", "label": "Later than two years and not later than three years [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of later than two years and not later than three years." } } }, "auth_ref": [ "r86", "r87", "r104", "r326", "r334", "r376" ] }, "bmo_LendingFeesRevenue": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LendingFeesRevenue", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Lending fees", "label": "Lending Fees Revenue", "documentation": "Lending fees revenue." } } }, "auth_ref": [] }, "ifrs-full_Level1OfFairValueHierarchyMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "Level1OfFairValueHierarchyMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Level 1", "label": "Level 1 of fair value hierarchy [member]" } }, "en": { "role": { "documentation": "This member stands for a category of the fair value hierarchy where inputs to the valuation techniques are quoted prices (unadjusted) in active markets for identical assets or liabilities that the entity can access at the measurement date." } } }, "auth_ref": [ "r11", "r27", "r29", "r72", "r205", "r242" ] }, "ifrs-full_Level2OfFairValueHierarchyMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "Level2OfFairValueHierarchyMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Level 2", "label": "Level 2 of fair value hierarchy [member]" } }, "en": { "role": { "documentation": "This member stands for a category of the fair value hierarchy where inputs to the valuation techniques are inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly." } } }, "auth_ref": [ "r27", "r29", "r72", "r205", "r242" ] }, "ifrs-full_Level3OfFairValueHierarchyMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "Level3OfFairValueHierarchyMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Level 3", "label": "Level 3 of fair value hierarchy [member]" } }, "en": { "role": { "documentation": "This member stands for a category of the fair value hierarchy where inputs to the valuation techniques are unobservable inputs for the asset or liability. Unobservable inputs are inputs for which market data are not available and that are developed using the best information available about the assumptions that the market participants would use when pricing the asset or liability." } } }, "auth_ref": [ "r27", "r29", "r72", "r205", "r242" ] }, "ifrs-full_LevelsOfFairValueHierarchyAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LevelsOfFairValueHierarchyAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Levels of fair value hierarchy [axis]", "label": "Levels of fair value hierarchy [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r11", "r72", "r242" ] }, "ifrs-full_LevelsOfFairValueHierarchyDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LevelsOfFairValueHierarchyDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Levels of fair value hierarchy [domain]", "label": "Levels of fair value hierarchy [domain]" } }, "en": { "role": { "documentation": "This member stands for all levels of the fair value hierarchy. It also represents the standard value for the 'Levels of fair value hierarchy' axis if no other member is used." } } }, "auth_ref": [ "r11", "r72", "r242" ] }, "bmo_LeverageExposure": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LeverageExposure", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Leverage Exposures", "label": "Leverage Exposure Measure", "documentation": "Leverage exposure." } } }, "auth_ref": [] }, "bmo_LeverageRatioPercentage": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LeverageRatioPercentage", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Leverage Ratio", "label": "Leverage ratio percentage", "documentation": "Tier 1 capital divided by the sum of on-balance sheet items and specified off-balance sheet items, net of specified adjustments." } } }, "auth_ref": [] }, "ifrs-full_Liabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "Liabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_EquityAndLiabilities", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Total Liabilities", "label": "Liabilities" } }, "en": { "role": { "documentation": "The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits." } } }, "auth_ref": [ "r71", "r72", "r78", "r157", "r161", "r241", "r242", "r270" ] }, "ifrs-full_LiabilitiesForIncurredClaimsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LiabilitiesForIncurredClaimsMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Liabilities for incurred claims", "label": "Liabilities for incurred claims [member]" } }, "en": { "role": { "documentation": "This member stands for an entity\u2019s obligation to: (a) investigate and pay valid claims for insured events that have already occurred, including events that have occurred but for which claims have not been reported, and other incurred insurance expenses; and (b) pay amounts that are not included in (a) and that relate to: (i) insurance contract services that have already been provided; or (ii) any investment components or other amounts that are not related to the provision of insurance contract services and that are not in the liability for remaining coverage." } } }, "auth_ref": [ "r89" ] }, "ifrs-full_LiabilitiesForIncurredClaimsThatAriseFromContractsWithinScopeOfIFRS17": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LiabilitiesForIncurredClaimsThatAriseFromContractsWithinScopeOfIFRS17", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Liabilities for incurred claims", "label": "Liabilities for incurred claims that arise from contracts within scope of IFRS 17" } }, "en": { "role": { "documentation": "The amount of the liabilities for incurred claims that arise from contracts within the scope of IFRS 17. [Refer: Liabilities for incurred claims [member]]" } } }, "auth_ref": [ "r102" ] }, "bmo_LiabilitiesMeasurementAxis": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LiabilitiesMeasurementAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Liabilities Measurement [Axis]", "label": "Liabilities Measurement [Axis]", "documentation": "Liabilities Measurement [Axis]" } } }, "auth_ref": [] }, "bmo_LiabilitiesMeasurementDomain": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LiabilitiesMeasurementDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Liabilities Measurement [Domain]", "label": "Liabilities Measurement [Domain]", "documentation": "Liabilities Measurement [Domain]" } } }, "auth_ref": [] }, "bmo_LiabilitiesRecognisedAsOfAcquisitionDate": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LiabilitiesRecognisedAsOfAcquisitionDate", "crdr": "credit", "calculation": { "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails": { "parentTag": "ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Total liabilities", "label": "Liabilities Recognised As Of Acquisition Date", "documentation": "Liabilities Recognised As Of Acquisition Date" } } }, "auth_ref": [] }, "bmo_LoanCommitmentsAndFinancialGuaranteeContractsIssuedMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoanCommitmentsAndFinancialGuaranteeContractsIssuedMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Commitments and financial guarantee contracts", "label": "Loan commitments and financial guarantee contracts issued [member]", "documentation": "Loan commitments and financial guarantee contracts issued." } } }, "auth_ref": [] }, "bmo_LoanOriginationOfAllowanceAccountForCreditLossesOfFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoanOriginationOfAllowanceAccountForCreditLossesOfFinancialAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Loan originations", "label": "Loan Origination Of Allowance Account For Credit Losses Of Financial Assets", "documentation": "Loan origination of allowance account for credit losses of financial assets." } } }, "auth_ref": [] }, "bmo_LoansAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Loans (Note 3)", "terseLabel": "Loans", "label": "Loans [abstract]", "documentation": "Loans [abstract]" } } }, "auth_ref": [] }, "ifrs-full_LoansAndAdvancesToCustomers": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "LoansAndAdvancesToCustomers", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Loans", "label": "Loans and advances to customers" } }, "en": { "role": { "documentation": "The amount of loans and advances the entity has made to customers." } } }, "auth_ref": [ "r377" ] }, "bmo_LoansAndReceivablesCarriedAtFairValueThroughProfitOrLoss": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansAndReceivablesCarriedAtFairValueThroughProfitOrLoss", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "FVTPL loans", "label": "Loans and Receivables Carried at Fair Value Through Profit or Loss", "documentation": "Loans and receivables carried at fair value through profit or loss." } } }, "auth_ref": [] }, "bmo_LoansAssetHeldForSale": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansAssetHeldForSale", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Loans held for sale", "label": "Loans Asset Held For Sale", "documentation": "Loans Asset Held For Sale" } } }, "auth_ref": [] }, "bmo_LoansBeforeAllowanceForLoanLosses": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansBeforeAllowanceForLoanLosses", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_LoansNetOfAllowanceForCreditLosses", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Loans gross of allowance for loan losses", "label": "Loans Before Allowance For Loan Losses", "documentation": "The amount of Retail and Wholesale loans made by the entity before allowance for loan losses." } } }, "auth_ref": [] }, "bmo_LoansHeldForTradingMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansHeldForTradingMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Trading loans", "label": "Loans Held For Trading [Member]", "documentation": "Loans Held For Trading [Member]" } } }, "auth_ref": [] }, "bmo_LoansNetOfAllowanceForCreditLosses": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansNetOfAllowanceForCreditLosses", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Assets", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Loans, net", "label": "Loans net of allowance for credit losses", "documentation": "Loans net of allowance for credit losses." } } }, "auth_ref": [] }, "bmo_LoansNetOfAllowanceForLoanLosses": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansNetOfAllowanceForLoanLosses", "crdr": "debit", "calculation": { "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Loans net of allowance for loan losses", "label": "Loans Net Of Allowance For Loan Losses", "documentation": "The amount of Retail and Wholesale loans made by the entity net of allowance for loan losses." } } }, "auth_ref": [] }, "bmo_LoansPastDueButNotImpaired": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansPastDueButNotImpaired", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total loans", "label": "Loans Past Due But Not Impaired", "documentation": "Loans Past Due But Not Impaired" } } }, "auth_ref": [] }, "bmo_LoansToBusinessAndGovernment": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LoansToBusinessAndGovernment", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_LoansBeforeAllowanceForLoanLosses", "weight": 1.0, "order": 4.0 }, "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails": { "parentTag": "bmo_LoansNetOfAllowanceForLoanLosses", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Business and government", "label": "Loans to business and government", "documentation": "The amount of loans to businesses and government made by the entity." } } }, "auth_ref": [] }, "bmo_LongtermDebtInstrumentsAxis": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LongtermDebtInstrumentsAxis", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "LongTerm Debt Instruments [Axis]", "label": "LongTerm Debt Instruments [Axis]", "documentation": "LongTerm Debt Instruments" } } }, "auth_ref": [] }, "bmo_LongtermDebtInstrumentsDomain": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LongtermDebtInstrumentsDomain", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "LongTerm Debt Instruments [Domain]", "label": "LongTerm Debt Instruments [Domain]", "documentation": "LongTerm Debt Instruments" } } }, "auth_ref": [] }, "bmo_LowProbabilityOfDefaultMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "LowProbabilityOfDefaultMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Low", "label": "Low probability of default [member]", "documentation": "Low probability of default." } } }, "auth_ref": [] }, "bmo_MandatorilyMeasuredAtFairValueMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "MandatorilyMeasuredAtFairValueMember", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "FVTPL securities mandatorily measured at fair value", "label": "Mandatorily measured at fair value [member]", "documentation": "Mandatorily measured at fair value." } } }, "auth_ref": [] }, "bmo_MaturitiesOfSecuritiesOtherThanTradingClassifiedAsInvestingActivities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "MaturitiesOfSecuritiesOtherThanTradingClassifiedAsInvestingActivities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Maturities of securities, other than trading", "label": "Maturities of securities other than trading classified as investing activities", "documentation": "Maturities of securities other than trading, classified as investing activities." } } }, "auth_ref": [] }, "ifrs-full_MaturityAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "MaturityAxis", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails", "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Maturity [axis]", "label": "Maturity [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r84", "r86", "r87", "r98", "r99", "r100", "r104", "r128", "r139", "r173", "r175", "r178", "r180", "r235", "r274", "r301", "r326" ] }, "ifrs-full_MaturityDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "MaturityDomain", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails", "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Maturity [domain]", "label": "Maturity [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregated time bands. It also represents the standard value for the 'Maturity' axis if no other member is used." } } }, "auth_ref": [ "r84", "r86", "r87", "r98", "r99", "r100", "r104", "r128", "r173", "r175", "r178", "r180", "r235", "r274", "r301", "r326", "r330" ] }, "ifrs-full_MeasurementAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "MeasurementAxis", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Measurement [axis]", "label": "Measurement [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r36", "r40", "r71", "r214", "r241" ] }, "ifrs-full_MeasurementDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "MeasurementDomain", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Measurement [domain]", "label": "Measurement [domain]" } }, "en": { "role": { "documentation": "This member stands for all types of measurement. It also represents the standard value for the 'Measurement' axis if no other member is used." } } }, "auth_ref": [ "r36", "r40", "r71", "r214", "r241" ] }, "bmo_MediumProbabilityOfDefaultMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "MediumProbabilityOfDefaultMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Medium", "label": "Medium probability of default [member]", "documentation": "Medium probability of default." } } }, "auth_ref": [] }, "bmo_MetalDeposits": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "MetalDeposits", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Metal deposits", "label": "Metal Deposits", "documentation": "Metal deposits." } } }, "auth_ref": [] }, "ifrs-full_MiscellaneousAssetsAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "MiscellaneousAssetsAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Other Assets", "label": "Miscellaneous assets [abstract]" } } }, "auth_ref": [] }, "ifrs-full_MiscellaneousLiabilitiesAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "MiscellaneousLiabilitiesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Other Liabilities", "label": "Miscellaneous liabilities [abstract]" } } }, "auth_ref": [] }, "bmo_ModelChangesAllowanceAccountForCreditLossesOfFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ModelChangesAllowanceAccountForCreditLossesOfFinancialAssets", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Model changes", "label": "Model changes allowance account for credit losses of financial assets", "documentation": "Amount charged to profit or loss due to changes in the models used to estimate expected credit losses." } } }, "auth_ref": [] }, "bmo_ModelledAllowanceAccountForCreditLossesOfFinancialAssetsBasedOnAssumptions": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ModelledAllowanceAccountForCreditLossesOfFinancialAssetsBasedOnAssumptions", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Modelled allowance account for credit losses of financial assets based on assumptions", "label": "Modelled allowance account for credit losses of financial assets based on assumptions", "documentation": "Modelled allowance account for credit losses of financial assets based on assumptions" } } }, "auth_ref": [] }, "bmo_MoneyMarketDeposits": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "MoneyMarketDeposits", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Money market deposits", "label": "Money Market Deposits", "documentation": "Money market deposits." } } }, "auth_ref": [] }, "ifrs-full_MortgagesMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "MortgagesMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Loans: Residential mortgages", "verboseLabel": "Residential mortgages", "label": "Mortgages [member]" } }, "en": { "role": { "documentation": "This member stands for a class of financial assets that represents loans to finance the purchase of assets where the asset acts as collateral to secure the loan." } } }, "auth_ref": [ "r324", "r331", "r335" ] }, "bmo_MutualFundRevenue": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "MutualFundRevenue", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 7.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Mutual fund revenues", "label": "Mutual fund revenue", "documentation": "Mutual fund revenue." } } }, "auth_ref": [] }, "bmo_NHAMBSUSAgencyMBSAndCMOMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NHAMBSUSAgencyMBSAndCMOMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "NHA MBS, U.S. agency MBS and CMO", "verboseLabel": "NHA MBS, and U.S. agency MBS and CMO", "label": "NHAMBS US Agency MBS And CMO [Member]", "documentation": "NHA MBS and U.S. agency MBS and CMO." } } }, "auth_ref": [] }, "bmo_NetCashProvidedByOperatingActivitiesIncludesAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NetCashProvidedByOperatingActivitiesIncludesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Net cash provided by operating activities includes:", "label": "Net Cash Provided by Operating Activities Includes [abstract] [Abstract]", "documentation": "Net Cash Provided By Operating Activities Includes." } } }, "auth_ref": [] }, "ifrs-full_NetLiabilitiesOrAssetsForRemainingCoverageExcludingLossComponentMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NetLiabilitiesOrAssetsForRemainingCoverageExcludingLossComponentMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryoftheInsuranceLiabilitybyRemainingCoverageandIncurredClaimsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Liabilities for remaining coverage", "label": "Net liabilities or assets for remaining coverage excluding loss component [member]" } }, "en": { "role": { "documentation": "This member stands for the net liabilities or assets for the remaining coverage component, excluding any loss component. A liability for remaining coverage is an entity\u2019s obligation to: (a) investigate and pay valid claims under existing insurance contracts for insured events that have not yet occurred (ie the obligation that relates to the unexpired portion of the insurance coverage); and (b) pay amounts under existing insurance contracts that are not included in (a) and that relate to: (i) insurance contract services not yet provided (ie the obligations that relate to future provision of insurance contract services); or (ii) any investment components or other amounts that are not related to the provision of insurance contract services and that have not been transferred to the liability for incurred claims. [Refer: Insurance contracts [domain]; Loss component [member]]" } } }, "auth_ref": [ "r88" ] }, "bmo_NetRemeasurementOfAllowanceAccountForCreditLossesOfFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NetRemeasurementOfAllowanceAccountForCreditLossesOfFinancialAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Net remeasurement of loss allowance", "label": "Net remeasurement of allowance account for credit losses of financial assets", "documentation": "Net remeasurement of allowance account for credit losses of financial assets." } } }, "auth_ref": [] }, "bmo_NetTotalLoansAndAcceptancesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NetTotalLoansAndAcceptancesMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total net loans and acceptances", "label": "Net Total Loans And Acceptances [Member]", "documentation": "Net total loans and acceptances." } } }, "auth_ref": [] }, "bmo_NonInterestBearingDepositsInstant": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonInterestBearingDepositsInstant", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Non interest bearing deposits", "label": "Non Interest Bearing Deposits instant", "documentation": "Non interest bearing deposits." } } }, "auth_ref": [] }, "bmo_NonInterestExpense1": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonInterestExpense1", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_ProfitLossBeforeTax", "weight": -1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Non-Interest Expense", "label": "Non Interest Expense 1", "documentation": "Non interest expense." } } }, "auth_ref": [] }, "bmo_NonInterestExpense1Abstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonInterestExpense1Abstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Non-Interest Expense", "label": "Non interest expense 1 [abstract]", "documentation": "Non interest expense 1." } } }, "auth_ref": [] }, "bmo_NonInterestExpenseExcludingAmortization": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonInterestExpenseExcludingAmortization", "crdr": "debit", "calculation": { "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails": { "parentTag": "ifrs-full_ProfitLossBeforeTax", "weight": -1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Non-interest expense", "label": "Non interest expense excluding amortization", "documentation": "Non interest expense excluding amortization." } } }, "auth_ref": [] }, "bmo_NonInterestExpenseOther": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonInterestExpenseOther", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestExpense1", "weight": 1.0, "order": 7.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Other", "label": "Non Interest Expense Other", "documentation": "Non-interest expense other." } } }, "auth_ref": [] }, "bmo_NonInterestIncome1": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonInterestIncome1", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_Revenue", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Non-Interest Revenue", "label": "Non Interest Income1", "documentation": "Non interest income." } } }, "auth_ref": [] }, "bmo_NonInterestIncome1Abstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonInterestIncome1Abstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Non-Interest Revenue", "label": "Non interest income 1 [abstract]", "documentation": "Non interest income 1." } } }, "auth_ref": [] }, "bmo_NonTradingSecuritiesAtFairValueThroughProfitOrLoss": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonTradingSecuritiesAtFairValueThroughProfitOrLoss", "crdr": "debit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails": { "parentTag": "bmo_BankSecuritiesCarryingAmount", "weight": 1.0, "order": 1.0 }, "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_Securities", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Fair value through profit or loss", "terseLabel": "Total FVTPL securities", "label": "Non Trading Securities at Fair value Through Profit or Loss", "documentation": "Non trading securities at fair value through profit or loss." } } }, "auth_ref": [] }, "bmo_NonTradingSecuritiesAtFairValueThroughProfitOrLossNonInterestRevenue": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonTradingSecuritiesAtFairValueThroughProfitOrLossNonInterestRevenue", "crdr": "credit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails": { "parentTag": "bmo_SecuritiesGainsOtherThanTrading", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "FVTPL securities", "label": "Non Trading Securities At Fair Value Through Profit Or Loss Non Interest Revenue", "documentation": "Non Trading Securities At Fair Value Through Profit Or Loss Non Interest Revenue" } } }, "auth_ref": [] }, "bmo_NonUsdNonCadMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NonUsdNonCadMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Non USD Non CAD", "label": "Non USD Non CAD [Member]", "documentation": "NonUSD NonCAD." } } }, "auth_ref": [] }, "ifrs-full_NonadjustingEventsAfterReportingPeriodAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NonadjustingEventsAfterReportingPeriodAxis", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Non-adjusting events after reporting period [axis]", "label": "Non-adjusting events after reporting period [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r0", "r189" ] }, "ifrs-full_NonadjustingEventsAfterReportingPeriodDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NonadjustingEventsAfterReportingPeriodDomain", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Non-adjusting events after reporting period [domain]", "label": "Non-adjusting events after reporting period [domain]" } }, "en": { "role": { "documentation": "This member stands for events that occur between the end of the reporting period and the date when the financial statements are authorised for issue and are indicative of conditions that arose after the reporting period. It also represents the standard value for the 'Non-adjusting events after reporting period' axis if no other member is used." } } }, "auth_ref": [ "r0", "r189" ] }, "ifrs-full_NoncontrollingInterests": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NoncontrollingInterests", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Equity", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Non-controlling interest in subsidiaries", "label": "Non-controlling interests" } }, "en": { "role": { "documentation": "The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Total for all subsidiaries [member]]" } } }, "auth_ref": [ "r57", "r59", "r268" ] }, "ifrs-full_NoncontrollingInterestsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NoncontrollingInterestsMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Non-Controlling Interest in Subsidiaries", "label": "Non-controlling interests [member]" } }, "en": { "role": { "documentation": "This member stands for equity in a subsidiary not attributable, directly or indirectly, to the parent." } } }, "auth_ref": [ "r260" ] }, "bmo_NormalCourseIssuerBidMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NormalCourseIssuerBidMember", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Normal Course Issuer Bid", "label": "Normal Course Issuer Bid [Member]", "documentation": "Normal course issuer bid." } } }, "auth_ref": [] }, "bmo_NotCarriedAtFairValueMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NotCarriedAtFairValueMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Not Carried at Fair Value", "label": "Not Carried At Fair Value [Member]", "documentation": "Not Carried At Fair Value [Member]" } } }, "auth_ref": [] }, "ifrs-full_NotLaterThanOneYearMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NotLaterThanOneYearMember", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "1 year", "label": "Not later than one year [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of not later than one year." } } }, "auth_ref": [ "r86", "r87", "r104", "r177", "r179", "r272", "r326", "r334" ] }, "ifrs-full_NotLaterThanThreeMonthsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NotLaterThanThreeMonthsMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofMaturityScheduleforDepositsGreaterthanOneHundredThousandDollarsBookedinCanadaDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Less than 3 months", "label": "Not later than three months [member]" } }, "en": { "role": { "documentation": "This member stands for a time band of not later than three months." } } }, "auth_ref": [ "r376" ] }, "bmo_NotRatedMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NotRatedMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Not Rated", "label": "Not Rated [Member]", "documentation": "Not Rated [Member]" } } }, "auth_ref": [] }, "ifrs-full_NotionalAmount": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NotionalAmount", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Notional amount", "label": "Notional amount" } }, "en": { "role": { "documentation": "The nominal or face amount of a financial instrument, used to calculate payments made on that instrument." } } }, "auth_ref": [ "r376" ] }, "bmo_NumberOfBranchesToBeSold": { "xbrltype": "integerItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NumberOfBranchesToBeSold", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Number of branches to be sold", "label": "Number Of Branches To Be Sold", "documentation": "Number Of Branches To Be Sold" } } }, "auth_ref": [] }, "bmo_NumberOfDaysForWhichTheLoanReceivableIsOverdueForTheLoansToBeWrittenOff": { "xbrltype": "durationItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NumberOfDaysForWhichTheLoanReceivableIsOverdueForTheLoansToBeWrittenOff", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Number of days for which the loan receivable is overdue for the loans to be written off", "label": "Number Of Days For Which The Loan Receivable Is Overdue For The Loans To Be Written Off", "documentation": "Number of days for which the loan receivable is overdue for the loans to be written off." } } }, "auth_ref": [] }, "bmo_NumberOfOperatingGroups": { "xbrltype": "integerItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NumberOfOperatingGroups", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Number of operating groups", "label": "Number of Operating Groups", "documentation": "Number of operating groups." } } }, "auth_ref": [] }, "ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement": { "xbrltype": "decimalItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NumberOfShareOptionsExercisableInSharebasedPaymentArrangement", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Number of share options exercisable in share-based payment arrangement (in shares)", "label": "Number of share options exercisable in share-based payment arrangement" } }, "en": { "role": { "documentation": "The number of share options exercisable in a share-based payment arrangement." } } }, "auth_ref": [ "r113", "r219" ] }, "ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement": { "xbrltype": "decimalItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NumberOfShareOptionsGrantedInSharebasedPaymentArrangement", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationShareBasedCompensationAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Number of share options granted in share-based payment arrangement", "label": "Number of share options granted in share-based payment arrangement" } }, "en": { "role": { "documentation": "The number of share options granted in a share-based payment arrangement." } } }, "auth_ref": [ "r112", "r218" ] }, "bmo_NumberOfSharesConvertibleUnderStockOptionPlan": { "xbrltype": "sharesItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NumberOfSharesConvertibleUnderStockOptionPlan", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Common shares convertible from stock option plan (in shares)", "label": "Number Of Shares Convertible Under Stock Option Plan", "documentation": "Number of shares convertible under stock option plan." } } }, "auth_ref": [] }, "bmo_NumberOfSharesIssuedThroughAcquisitionOfSubsidiaryEquity": { "xbrltype": "sharesItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NumberOfSharesIssuedThroughAcquisitionOfSubsidiaryEquity", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Number of shares issued in an acquisition (in shares)", "label": "Number Of Shares Issued Through Acquisition Of Subsidiary, Equity", "documentation": "Number Of Shares Issued Through Acquisition Of Subsidiary, Equity" } } }, "auth_ref": [] }, "bmo_NumberOfSharesIssuedUnderStockOptionPlan": { "xbrltype": "sharesItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NumberOfSharesIssuedUnderStockOptionPlan", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Common shares issued under stock option plan (in shares)", "label": "Number Of Shares Issued Under Stock Option Plan", "documentation": "Number Of Shares Issued Under Stock Option Plan." } } }, "auth_ref": [] }, "ifrs-full_NumberOfSharesOutstanding": { "xbrltype": "sharesItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "NumberOfSharesOutstanding", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Number of shares (in shares)", "label": "Number of shares outstanding" } }, "en": { "role": { "documentation": "The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares]" } } }, "auth_ref": [ "r183", "r246", "r277" ] }, "bmo_NumberOfSharesRepurchaseUnderNormalCourseIssuerBid": { "xbrltype": "sharesItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "NumberOfSharesRepurchaseUnderNormalCourseIssuerBid", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Number of shares repurchase under normal course issuer bid (in shares)", "label": "Number Of Shares Repurchase Under Normal Course Issuer Bid", "documentation": "Number of shares repurchase under normal course issuer bid." } } }, "auth_ref": [] }, "bmo_OnerousContractLosses": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OnerousContractLosses", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Onerous contract losses", "label": "Onerous Contract Losses", "documentation": "Onerous Contract Losses" } } }, "auth_ref": [] }, "bmo_OperatingIncomeExcludingInterest": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OperatingIncomeExcludingInterest", "crdr": "credit", "calculation": { "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails": { "parentTag": "ifrs-full_Revenue", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Non-interest revenue", "label": "Operating income excluding interest", "documentation": "Operating income excluding interest." } } }, "auth_ref": [] }, "ifrs-full_OrdinarySharesMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OrdinarySharesMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/EquityAdditionalInformationDetails", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Dividends per common share", "netLabel": "Common shares", "verboseLabel": "Common Shares", "label": "Ordinary shares [member]" } }, "en": { "role": { "documentation": "This member stands for equity instruments that are subordinate to all other classes of equity instruments." } } }, "auth_ref": [ "r378" ] }, "ifrs-full_OtherAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 8.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Other", "label": "Other assets" } }, "en": { "role": { "documentation": "The amount of assets that the entity does not separately disclose in the same statement or note." } } }, "auth_ref": [ "r377" ] }, "ifrs-full_OtherAssetsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherAssetsMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other assets", "label": "Other assets [member]" } }, "en": { "role": { "documentation": "This member stands for assets that the entity does not separately disclose in the same statement or note." } } }, "auth_ref": [ "r313", "r340" ] }, "bmo_OtherAssetsRecognisedAsOfAcquisitionDate": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherAssetsRecognisedAsOfAcquisitionDate", "crdr": "debit", "calculation": { "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails": { "parentTag": "bmo_IdentifiableAssetsAcquiredRecognisedAsOfAcquisitionDate", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other assets", "label": "Other Assets Recognised As Of Acquisition Date", "documentation": "Other Assets Recognised As Of Acquisition Date" } } }, "auth_ref": [] }, "ifrs-full_OtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherComprehensiveIncome", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_ComprehensiveIncome", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Total Other Comprehensive Income (Loss), net of taxes", "label": "Other comprehensive income" } } }, "auth_ref": [ "r65", "r257", "r281", "r294" ] }, "ifrs-full_OtherComprehensiveIncomeAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherComprehensiveIncomeAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Other Comprehensive Income (Loss), net of taxes", "label": "Other comprehensive income [abstract]" } } }, "auth_ref": [] }, "ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherComprehensiveIncomeNetOfTaxCashFlowHedges", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncome", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Net change in unrealized gains (losses) on derivatives designated as cash flow hedges", "label": "Other comprehensive income, net of tax, cash flow hedges" } }, "en": { "role": { "documentation": "The amount of other comprehensive income, net of tax, after reclassification adjustments, related to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income]" } } }, "auth_ref": [ "r275", "r294" ] }, "ifrs-full_OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Net gains (losses) on remeasurement of own credit risk on financial liabilities designated at fair value", "verboseLabel": "Gains on remeasurement of own credit risk on financial liabilities designated at fair value", "label": "Other comprehensive income, net of tax, change in fair value of financial liability attributable to change in credit risk of liability" } }, "en": { "role": { "documentation": "The amount of other comprehensive income, net of tax, related to changes in the fair value of financial liabilities attributable to the changes in the credit risk of those liabilities. [Refer: Other comprehensive income; Credit risk [member]; Financial liabilities]" } } }, "auth_ref": [ "r275", "r294" ] }, "ifrs-full_OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncome", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Net change in unrealized gains (losses) on fair value through OCI debt securities", "label": "Other comprehensive income, net of tax, financial assets measured at fair value through other comprehensive income" } }, "en": { "role": { "documentation": "The amount of other comprehensive income, net of tax, after reclassification adjustments, related to financial assets measured at fair value through other comprehensive income applying paragraph 4.1.2A of IFRS 9. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]" } } }, "auth_ref": [ "r275", "r294" ] }, "ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Net unrealized gains (losses) on fair value through OCI equity securities arising during the period", "label": "Other comprehensive income, net of tax, gains (losses) from investments in equity instruments" } }, "en": { "role": { "documentation": "The amount of other comprehensive income, net of tax, related to gains (losses) from changes in the fair value of investments in equity instruments that the entity has designated at fair value through other comprehensive income applying paragraph 5.7.5 of IFRS 9. [Refer: Other comprehensive income]" } } }, "auth_ref": [ "r275", "r294" ] }, "ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Net gains (losses) on remeasurement of pension and other employee future benefit plans", "verboseLabel": "Gains (losses) on remeasurement of pension and other employee future benefit plans", "label": "Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans" } }, "en": { "role": { "documentation": "The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]" } } }, "auth_ref": [ "r275", "r294", "r355" ] }, "bmo_OtherComprehensiveIncomeNetOfTaxesTranslationOfNetForeignOperations": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherComprehensiveIncomeNetOfTaxesTranslationOfNetForeignOperations", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncome", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Net (losses) on translation of net foreign operations", "label": "Other Comprehensive Income Net Of Taxes Translation Of Net Foreign Operations", "documentation": "The amount of other comprehensive income, net of tax, related to exchange differences when financial statements of foreign operations are translated. [Refer: Other comprehensive income]" } } }, "auth_ref": [] }, "ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncome", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Items that will not be subsequently reclassified to net income", "label": "Other comprehensive income that will not be reclassified to profit or loss, net of tax" } }, "en": { "role": { "documentation": "The amount of other comprehensive income that will not be reclassified to profit or loss, net of tax. [Refer: Other comprehensive income]" } } }, "auth_ref": [ "r352", "r353" ] }, "bmo_OtherCountriesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherCountriesMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other countries", "verboseLabel": "Other", "label": "Other Countries [member]", "documentation": "Other countries." } } }, "auth_ref": [] }, "bmo_OtherEmployeeFutureBenefitPlansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherEmployeeFutureBenefitPlansMember", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other employee future benefit plans", "label": "Other employee future benefit plans [Member]", "documentation": "Other employee future benefit plans." } } }, "auth_ref": [] }, "bmo_OtherEquityInstrumentsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherEquityInstrumentsMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other Equity Instruments", "label": "Other Equity Instruments [Member]", "documentation": "Other equity instruments." } } }, "auth_ref": [] }, "bmo_OtherGovernmentSecuritiesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherGovernmentSecuritiesMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other governments", "label": "Other Government Securities [member]", "documentation": "Other Government Securities [member]" } } }, "auth_ref": [] }, "bmo_OtherGovernmentsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherGovernmentsMember", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other governments", "label": "Other Governments [Member]", "documentation": "Other governments member." } } }, "auth_ref": [] }, "ifrs-full_OtherLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "OtherLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousLiabilities", "weight": 1.0, "order": 8.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other", "verboseLabel": "Other liabilities", "label": "Other liabilities" } }, "en": { "role": { "documentation": "The amount of liabilities that the entity does not separately disclose in the same statement or note." } } }, "auth_ref": [ "r377" ] }, "bmo_OtherLiabilitiesAtFairValue": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherLiabilitiesAtFairValue", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other liabilities", "label": "Other Liabilities At Fair Value", "documentation": "Other liabilities at fair value." } } }, "auth_ref": [] }, "bmo_OtherLiabilitiesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherLiabilitiesMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other Liabilities", "label": "Other Liabilities [Member]", "documentation": "Other liabilities." } } }, "auth_ref": [] }, "bmo_OtherLiabilitiesRecognizedAsOfAcquisitionDate": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherLiabilitiesRecognizedAsOfAcquisitionDate", "crdr": "credit", "calculation": { "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails": { "parentTag": "bmo_LiabilitiesRecognisedAsOfAcquisitionDate", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresSummaryofAssetsAcquiredandLiabilitiesAssumedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other liabilities", "label": "Other Liabilities Recognized As Of Acquisition Date", "documentation": "Other Liabilities Recognized As Of Acquisition Date" } } }, "auth_ref": [] }, "bmo_OtherMiscellaneousAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherMiscellaneousAssets", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Assets", "weight": 1.0, "order": 6.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Other Assets", "label": "Other Miscellaneous Assets", "documentation": "Other miscellaneous assets." } } }, "auth_ref": [] }, "bmo_OtherMiscellaneousLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherMiscellaneousLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Liabilities", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Other Liabilities", "label": "Other miscellaneous liabilities", "documentation": "Other miscellaneous liabilities." } } }, "auth_ref": [] }, "bmo_OtherRevenuesLosses": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "OtherRevenuesLosses", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 12.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Other revenues (losses)", "label": "Other Revenues Losses", "documentation": "Other revenues losses." } } }, "auth_ref": [] }, "ifrs-full_PastDueStatusAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PastDueStatusAxis", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Past due status [axis]", "label": "Past due status [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r323" ] }, "ifrs-full_PastDueStatusDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PastDueStatusDomain", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Past due status [domain]", "label": "Past due status [domain]" } }, "en": { "role": { "documentation": "This member stands for all past-due statuses. It also represents the standard value for the 'Past due status' axis if no other member is used." } } }, "auth_ref": [ "r323" ] }, "bmo_PayableToBrokersDealersAndClients": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PayableToBrokersDealersAndClients", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousLiabilities", "weight": 1.0, "order": 7.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Payable to brokers, dealers and clients", "label": "Payable To Brokers Dealers And Clients", "documentation": "Payable to brokers, dealers and clients." } } }, "auth_ref": [] }, "ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": -1.0, "order": 8.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Repayment of lease liabilities", "label": "Payments of lease liabilities, classified as financing activities" } }, "en": { "role": { "documentation": "The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities]" } } }, "auth_ref": [ "r304" ] }, "ifrs-full_PaymentsToAcquireOrRedeemEntitysShares": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PaymentsToAcquireOrRedeemEntitysShares", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": -1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Redemption of preferred shares (Note 6)", "label": "Payments to acquire or redeem entity's shares" } }, "en": { "role": { "documentation": "The cash outflow to acquire or redeem entity's shares." } } }, "auth_ref": [ "r303" ] }, "bmo_PaymentsToRepurchaseOfCommonSharesForCancellation": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PaymentsToRepurchaseOfCommonSharesForCancellation", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": -1.0, "order": 6.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Common shares repurchased for cancellation (Note 6)", "label": "Payments To Repurchase Of Common Shares For Cancellation", "documentation": "Payments To Repurchase Of Common Shares For Cancellation." } } }, "auth_ref": [] }, "bmo_PensionAndOtherEmployeeFutureBenefitExpensesRecovery": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PensionAndOtherEmployeeFutureBenefitExpensesRecovery", "crdr": "debit", "calculation": { "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Total pension and other employee future benefit expenses recognized in our Consolidated Statement of Income", "label": "Pension And Other Employee Future Benefit Expenses Recovery", "documentation": "Pension and other employee future benefit expenses (recovery)." } } }, "auth_ref": [] }, "ifrs-full_PensionDefinedBenefitPlansMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PensionDefinedBenefitPlansMember", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Pension defined benefit plans", "label": "Pension defined benefit plans [member]" } }, "en": { "role": { "documentation": "This member stands for pension defined benefit plans. [Refer: Defined benefit plans [domain]]" } } }, "auth_ref": [ "r356" ] }, "bmo_PensionPlansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PensionPlansMember", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Pension plans", "label": "Pension Plans [member]", "documentation": "Pension Plans [member]" } } }, "auth_ref": [] }, "bmo_PercentageOfNetDepositPremium": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PercentageOfNetDepositPremium", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Percentage of net deposit premium", "label": "Percentage Of Net Deposit Premium", "documentation": "Percentage Of Net Deposit Premium" } } }, "auth_ref": [] }, "bmo_PerformingLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PerformingLoansMember", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Provision for (recovery of) credit losses on performing loans", "label": "Performing loans [Member]", "documentation": "Performing loans." } } }, "auth_ref": [] }, "bmo_PerformingLoansStageOneScenarioMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PerformingLoansStageOneScenarioMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Performing loans, stage one scenario", "label": "Performing loans, stage one scenario [member]", "documentation": "Performing loans, stage one scenario [member]" } } }, "auth_ref": [] }, "bmo_PersonalDepositMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PersonalDepositMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Individuals", "label": "Personal Deposit [Member]", "documentation": "Personal Deposit [Member]" } } }, "auth_ref": [] }, "ifrs-full_PortfolioAndOtherManagementFeeIncome": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PortfolioAndOtherManagementFeeIncome", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 6.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Investment management and custodial fees", "label": "Portfolio and other management fee income" } } }, "auth_ref": [ "r376" ] }, "bmo_PostemploymentBenefitExpense": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PostemploymentBenefitExpense", "crdr": "debit", "calculation": { "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails": { "parentTag": "bmo_PensionAndOtherEmployeeFutureBenefitExpensesRecovery", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Benefits expense", "label": "Postemployment Benefit Expense", "documentation": "Post employment benefit expense." } } }, "auth_ref": [] }, "ifrs-full_PostemploymentBenefitExpenseDefinedContributionPlans": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PostemploymentBenefitExpenseDefinedContributionPlans", "crdr": "debit", "calculation": { "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails": { "parentTag": "bmo_PensionAndOtherEmployeeFutureBenefitExpensesRecovery", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofPensionandOtherEmployeeFutureBenefitExpensesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Defined contribution expense", "label": "Post-employment benefit expense, defined contribution plans" } } }, "auth_ref": [ "r12", "r196" ] }, "bmo_PreciousMetalsAndOtherReceivablesAtFairValue": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PreciousMetalsAndOtherReceivablesAtFairValue", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Other Assets", "label": "Precious Metals And Other Receivables At Fair Value", "documentation": "Precious metals and other receivables at fair value." } } }, "auth_ref": [] }, "ifrs-full_PreferenceSharesMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PreferenceSharesMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Preferred Shares \u2013 Classified as Equity", "label": "Preference shares [member]" } }, "en": { "role": { "documentation": "This member stands for equity instruments that are senior in some aspects to ordinary shares, but subordinate to debt instruments in terms of claim. [Refer: Ordinary shares [member]]" } } }, "auth_ref": [ "r378" ] }, "bmo_PreferredSharesAndOtherEquityInstrumentsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PreferredSharesAndOtherEquityInstrumentsMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Preferred shares and other equity instruments", "verboseLabel": "Preferred Shares and Other Equity Instruments", "label": "Preferred Shares and Other Equity Instruments [Member]", "documentation": "Preferred Shares and Other Equity Instruments" } } }, "auth_ref": [] }, "bmo_PreferredSharesRedeemed": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PreferredSharesRedeemed", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Preferred shares redeemed", "label": "Preferred Shares Redeemed", "documentation": "Preferred Shares Redeemed" } } }, "auth_ref": [] }, "bmo_PremisesAndEquipmentRelatedExpenses": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PremisesAndEquipmentRelatedExpenses", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestExpense1", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Premises and equipment", "label": "Premises and equipment related expenses", "documentation": "Premises and equipment related expenses" } } }, "auth_ref": [] }, "bmo_PrincipalMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PrincipalMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Principal", "label": "Principal [Member]", "documentation": "Principal [Member]" } } }, "auth_ref": [] }, "ifrs-full_ProbabilityOfDefaultAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProbabilityOfDefaultAxis", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Probability of default [axis]", "label": "Probability of default [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r322", "r332", "r346" ] }, "ifrs-full_ProbabilityOfDefaultDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProbabilityOfDefaultDomain", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Probability of default [domain]", "label": "Probability of default [domain]" } }, "en": { "role": { "documentation": "This member stands for the standard value for the 'Probability of default' axis if no other member is used." } } }, "auth_ref": [ "r322", "r332", "r346" ] }, "ifrs-full_ProceedsFromIssueOfOrdinaryShares": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProceedsFromIssueOfOrdinaryShares", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Net proceeds from issuance of common shares (Note 6)", "label": "Proceeds from issue of ordinary shares" } }, "en": { "role": { "documentation": "The cash inflow from the issuing of ordinary shares. [Refer: Ordinary shares [member]]" } } }, "auth_ref": [ "r360" ] }, "ifrs-full_ProceedsFromIssueOfSubordinatedLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProceedsFromIssueOfSubordinatedLiabilities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": 1.0, "order": 9.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Proceeds from issuance of subordinated debt (Note 4)", "label": "Proceeds from issue of subordinated liabilities" } }, "en": { "role": { "documentation": "The cash inflow from the issuing of subordinated liabilities. [Refer: Subordinated liabilities]" } } }, "auth_ref": [ "r360" ] }, "bmo_ProceedsFromSalePurchaseOrIssueOfTreasuryShares": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ProceedsFromSalePurchaseOrIssueOfTreasuryShares", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "verboseLabel": "Net sale (purchase) of treasury shares", "label": "Proceeds From Sale Purchase or Issue of Treasury Shares", "documentation": "Proceeds from sale purchase or issue of treasury shares." } } }, "auth_ref": [] }, "bmo_ProceedsFromSalesOfSecuritiesOtherThanTradingClassifiedAsInvestingActivities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ProceedsFromSalesOfSecuritiesOtherThanTradingClassifiedAsInvestingActivities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Proceeds from sales of securities, other than trading", "label": "Proceeds from Sales of Securities Other Than Trading Classified as Investing Activities", "documentation": "Proceeds from sales of securities other than trading, classified as investing activities." } } }, "auth_ref": [] }, "ifrs-full_ProductsAndServicesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProductsAndServicesAxis", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Products and services [axis]", "label": "Products and services [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r164", "r311", "r338" ] }, "ifrs-full_ProductsAndServicesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProductsAndServicesDomain", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Products and services [domain]", "label": "Products and services [domain]" } }, "en": { "role": { "documentation": "This member stands for the entity's products and services. It also represents the standard value for the 'Products and services' axis if no other member is used." } } }, "auth_ref": [ "r164", "r311", "r338" ] }, "ifrs-full_ProfessionalFeesExpense": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProfessionalFeesExpense", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestExpense1", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Professional fees", "label": "Professional fees expense" } } }, "auth_ref": [ "r376" ] }, "ifrs-full_ProfitLoss": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProfitLoss", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_ComprehensiveIncome", "weight": 1.0, "order": 1.0 }, "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInOperatingActivities", "weight": 1.0, "order": 13.0 }, "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": null, "weight": null, "order": null, "root": true }, "http://www.bmo.com/role/ConsolidatedStatementofIncomeAlternativeCalc": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows", "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome", "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Net Income", "terseLabel": "Net Income", "verboseLabel": "Net income attributable to bank shareholders", "label": "Profit (loss)" } }, "en": { "role": { "documentation": "The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income]" } } }, "auth_ref": [ "r54", "r56", "r157", "r159", "r201", "r217", "r256", "r280", "r306", "r314" ] }, "ifrs-full_ProfitLossAttributableToAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProfitLossAttributableToAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Attributable to:", "label": "Profit (loss), attributable to [abstract]" } } }, "auth_ref": [] }, "ifrs-full_ProfitLossAttributableToNoncontrollingInterests": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProfitLossAttributableToNoncontrollingInterests", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncomeAlternativeCalc": { "parentTag": "ifrs-full_ProfitLoss", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Non-controlling interest in subsidiaries", "verboseLabel": "Net income attributable to non-controlling interest in subsidiaries", "label": "Profit (loss), attributable to non-controlling interests" } }, "en": { "role": { "documentation": "The profit (loss) from continuing and discontinued operations attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests]" } } }, "auth_ref": [ "r58", "r283" ] }, "ifrs-full_ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity", "crdr": "credit", "calculation": { "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Net income available to common shareholders", "terseLabel": "Net income available to common shareholders", "label": "Profit (loss), attributable to ordinary equity holders of parent entity, used in calculating basic earnings per share" } }, "en": { "role": { "documentation": "The profit (loss) attributable to ordinary equity holders of the parent entity. [Refer: Profit (loss)]" } } }, "auth_ref": [ "r21" ] }, "ifrs-full_ProfitLossAttributableToOwnersOfParent": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProfitLossAttributableToOwnersOfParent", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncomeAlternativeCalc": { "parentTag": "ifrs-full_ProfitLoss", "weight": 1.0, "order": 1.0 }, "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails": { "parentTag": "ifrs-full_ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Bank shareholders", "netLabel": "Net income attributable to bank shareholders", "verboseLabel": "Net income (loss) attributable to bank shareholders", "label": "Profit (loss), attributable to owners of parent" } }, "en": { "role": { "documentation": "The profit (loss) from continuing and discontinued operations attributable to owners of the parent. [Refer: Profit (loss)]" } } }, "auth_ref": [ "r284" ] }, "ifrs-full_ProfitLossBeforeTax": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProfitLossBeforeTax", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_ProfitLoss", "weight": 1.0, "order": 1.0 }, "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Income Before Provision for Income Taxes", "label": "Profit (loss) before tax" } } }, "auth_ref": [ "r126", "r336", "r337", "r348", "r349" ] }, "ifrs-full_PropertyPlantAndEquipment": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PropertyPlantAndEquipment", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "verboseLabel": "Premises and equipment", "label": "Property, plant and equipment" } }, "en": { "role": { "documentation": "The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. Note that right-of-use assets are not included. [Contrast: Property, plant and equipment including right-of-use assets]" } } }, "auth_ref": [ "r8", "r195", "r263" ] }, "ifrs-full_ProportionOfOwnershipInterestInSubsidiary": { "xbrltype": "percentItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ProportionOfOwnershipInterestInSubsidiary", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Equity interest ownership percent", "label": "Proportion of ownership interest in subsidiary" } }, "en": { "role": { "documentation": "The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Total for all subsidiaries [member]]" } } }, "auth_ref": [ "r15", "r17", "r60" ] }, "bmo_ProvisionForCreditLosses": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ProvisionForCreditLosses", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total PCL", "negatedLabel": "Provision for credit losses", "label": "Provision for Credit Losses", "documentation": "Provision for credit losses." } } }, "auth_ref": [] }, "ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities", "weight": -1.0, "order": 5.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Net purchases of premises and equipment and software", "label": "Purchase of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets" } }, "en": { "role": { "documentation": "The cash outflow for the purchase of property, plant and equipment, intangible assets other than goodwill, investment property and other non-current assets. [Refer: Intangible assets other than goodwill; Investment property; Other non-current assets; Property, plant and equipment]" } } }, "auth_ref": [ "r359" ] }, "bmo_PurchaseOfSecuritiesOtherThanTradingClassifiedAsInvestingActivities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "PurchaseOfSecuritiesOtherThanTradingClassifiedAsInvestingActivities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInInvestingActivities", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "negatedLabel": "Purchases of securities, other than trading", "label": "Purchase of securities other than trading classified as investing activities", "documentation": "Payments for purchase of securities other than trading, classified as investing activities." } } }, "auth_ref": [] }, "ifrs-full_PurchasesFairValueMeasurementAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PurchasesFairValueMeasurementAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Purchases/Issuances", "label": "Purchases, fair value measurement, assets" } }, "en": { "role": { "documentation": "The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r76" ] }, "ifrs-full_PurchasesFairValueMeasurementLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "PurchasesFairValueMeasurementLiabilities", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Purchases/Issuances", "label": "Purchases, fair value measurement, liabilities" } }, "en": { "role": { "documentation": "The increase in the fair value measurement of liabilities resulting from purchases of those liabilities. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r76" ] }, "ifrs-full_RangeAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RangeAxis", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails", "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Range [axis]", "label": "Range [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r49", "r82", "r100", "r114", "r186", "r308", "r310", "r365" ] }, "ifrs-full_RangeDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RangeDomain", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails", "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Range [domain]", "label": "Range [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregate ranges. It also represents the standard value for the 'Range' axis if no other member is used." } } }, "auth_ref": [ "r49", "r82", "r100", "r114", "r186", "r308", "r310", "r365" ] }, "bmo_RealGrossDomesticProductGrowthRate": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "RealGrossDomesticProductGrowthRate", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Real GDP growth rates", "label": "Real Gross Domestic Product Growth Rate", "documentation": "Real gross domestic product growth rate." } } }, "auth_ref": [] }, "bmo_RealizedGainsFromFairValueThroughOtherComprehensiveIncomeSecurities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "RealizedGainsFromFairValueThroughOtherComprehensiveIncomeSecurities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails": { "parentTag": "bmo_InterestAndDividendIncomeAndGainLossesOnFinancialAssets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofInterestandDividendIncomeandGainsonSecuritiesDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Realized gains (losses) from FVOCI securities", "label": "Realized Gains From Fair Value Through Other Comprehensive Income Securities", "documentation": "Realized gains from fair value through other comprehensive income securities." } } }, "auth_ref": [] }, "bmo_ReceivableFromBrokersDealersAndClients": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ReceivableFromBrokersDealersAndClients", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousAssets", "weight": 1.0, "order": 9.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Receivable from brokers, dealers and clients", "label": "Receivable From Brokers Dealers And Clients", "documentation": "Receivable from brokers, dealers and clients." } } }, "auth_ref": [] }, "ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ReclassificationAdjustmentsOnCashFlowHedgesNetOfTax", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "negatedLabel": "Reclassification to earnings of losses on derivatives designated as cash flow hedges during the period", "negatedTerseLabel": "Reclassification to earnings of losses on derivatives designated as cash flow hedges during the period", "label": "Reclassification adjustments on cash flow hedges, net of tax" } }, "en": { "role": { "documentation": "The amount of reclassification adjustments related to cash flow hedges, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Cash flow hedges [member]; Other comprehensive income]" } } }, "auth_ref": [ "r130", "r131", "r234", "r295" ] }, "ifrs-full_ReclassificationAdjustmentsOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ReclassificationAdjustmentsOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeNetOfTax", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome": { "parentTag": "ifrs-full_OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Reclassification to earnings of (gains) during the period", "negatedLabel": "Reclassification to earnings of (gains) during the period", "label": "Reclassification adjustments on financial assets measured at fair value through other comprehensive income, net of tax" } }, "en": { "role": { "documentation": "The amount of reclassification adjustments related to financial assets measured at fair value through other comprehensive income, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]" } } }, "auth_ref": [ "r295" ] }, "ifrs-full_RecoveriesOnLoansPreviouslyWrittenOff": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RecoveriesOnLoansPreviouslyWrittenOff", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Recoveries of previous write-offs", "label": "Recoveries on loans previously written off" } }, "en": { "role": { "documentation": "The cash inflow from the recoveries on loans that were previously written off." } } }, "auth_ref": [ "r305" ] }, "bmo_RedeemablePreferenceSharesValueOutstanding": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "RedeemablePreferenceSharesValueOutstanding", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Redemption amount", "label": "Redeemable Preference Shares Value Outstanding", "documentation": "Redeemable preference shares value outstanding." } } }, "auth_ref": [] }, "ifrs-full_ReductionOfIssuedCapital": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ReductionOfIssuedCapital", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "negatedLabel": "Redeemed during the period", "label": "Reduction of issued capital" } }, "en": { "role": { "documentation": "The decrease in equity resulting from a reduction in issued capital. [Refer: Issued capital]" } } }, "auth_ref": [ "r374" ] }, "ifrs-full_ReinsuranceContractsHeldMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ReinsuranceContractsHeldMember", "presentation": [ "http://www.bmo.com/role/InsuranceAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Reinsurance contracts held", "label": "Reinsurance contracts held [member]" } }, "en": { "role": { "documentation": "This member stands for reinsurance contracts held. Reinsurance contracts are insurance contracts issued by one entity (the reinsurer) to compensate another entity for claims arising from one or more insurance contracts issued by that other entity (underlying contracts). [Refer: Insurance contracts [domain]]" } } }, "auth_ref": [ "r97", "r98", "r103", "r104", "r107" ] }, "bmo_RelatedToPerformingLoansAssumingHundredPercentBaseCaseScenarioMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "RelatedToPerformingLoansAssumingHundredPercentBaseCaseScenarioMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Related to performing loans, assuming 100% base case scenario", "label": "Related to performing loans, assuming hundred percent base case scenario [member]", "documentation": "Related to performing loans, assuming hundred percent base case scenario [member]" } } }, "auth_ref": [] }, "bmo_RelatedToPerformingLoansAssumingHundredPercentSevereDownsideScenarioMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "RelatedToPerformingLoansAssumingHundredPercentSevereDownsideScenarioMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Related to performing loans, assuming 100% severe downside scenario", "label": "Related to performing loans, assuming hundred percent severe downside scenario [Member]", "documentation": "Related to performing loans, assuming hundred percent adverse scenario." } } }, "auth_ref": [] }, "bmo_RelatedToSecuritiesHeldByInsuranceSubsidiariesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "RelatedToSecuritiesHeldByInsuranceSubsidiariesMember", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "FVTPL investment securities held by Insurance subsidiaries designated at fair value", "label": "Related To Securities Held By Insurance Subsidiaries [Member]", "documentation": "Related to securities held by insurance subsidiaries [member]" } } }, "auth_ref": [] }, "bmo_RemainingTwoYearsHorizonMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "RemainingTwoYearsHorizonMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Remaining horizon", "label": "Remaining Two Years Horizon [Member]", "documentation": "Remaining two years horizon." } } }, "auth_ref": [] }, "ifrs-full_RepaymentsOfSubordinatedLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RepaymentsOfSubordinatedLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofCashFlows": { "parentTag": "ifrs-full_CashFlowsFromUsedInFinancingActivities", "weight": -1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows", "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "negatedTerseLabel": "Repayment of subordinated debt (Note 4)", "terseLabel": "Repayments of subordinated liabilities", "label": "Repayments of subordinated liabilities" } }, "en": { "role": { "documentation": "The cash outflow for repayments of subordinated liabilities. [Refer: Subordinated liabilities]" } } }, "auth_ref": [ "r360" ] }, "ifrs-full_RepurchaseAgreementsAndCashCollateralOnSecuritiesLent": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RepurchaseAgreementsAndCashCollateralOnSecuritiesLent", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousLiabilities", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Securities lent or sold under repurchase agreements", "label": "Repurchase agreements and cash collateral on securities lent" } }, "en": { "role": { "documentation": "The amount of instruments sold with the intent to reacquire in repurchase agreements and cash collateral on securities lent." } } }, "auth_ref": [ "r377" ] }, "bmo_ResidentialMortgageLoans": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ResidentialMortgageLoans", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_LoansBeforeAllowanceForLoanLosses", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Residential mortgages", "label": "Residential Mortgage Loans", "documentation": "Residential mortgage loans." } } }, "auth_ref": [] }, "bmo_ResidentialMortgagesLoans": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ResidentialMortgagesLoans", "crdr": "debit", "calculation": { "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails": { "parentTag": "bmo_LoansNetOfAllowanceForLoanLosses", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Residential mortgages", "label": "Residential mortgages loans", "documentation": "Residential mortgages loans." } } }, "auth_ref": [] }, "bmo_ResidentialMortgagesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ResidentialMortgagesMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Loans: Residential mortgages", "verboseLabel": "Residential mortgages", "label": "Residential Mortgages [Member]", "documentation": "Residential Mortgages [Member]" } } }, "auth_ref": [] }, "ifrs-full_RestrictedCashAndCashEquivalents": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RestrictedCashAndCashEquivalents", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlowsParenthetical" ], "lang": { "en-us": { "role": { "terseLabel": "Restricted cash and cash equivalents", "label": "Restricted cash and cash equivalents" } }, "en": { "role": { "documentation": "The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents]" } } }, "auth_ref": [ "r377" ] }, "ifrs-full_RetainedEarnings": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RetainedEarnings", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_EquityAttributableToOwnersOfParent", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Retained earnings", "label": "Retained earnings" } }, "en": { "role": { "documentation": "A component of equity representing the entity's cumulative undistributed earnings or deficit." } } }, "auth_ref": [ "r347", "r351", "r353" ] }, "ifrs-full_RetainedEarningsMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RetainedEarningsMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Retained Earnings", "label": "Retained earnings [member]" } }, "en": { "role": { "documentation": "This member stands for a component of equity representing an entity's cumulative undistributed earnings or deficit." } } }, "auth_ref": [ "r260", "r350" ] }, "ifrs-full_Revenue": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "Revenue", "crdr": "credit", "calculation": { "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails": { "parentTag": "ifrs-full_ProfitLossBeforeTax", "weight": 1.0, "order": 1.0 }, "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "ifrs-full_ProfitLossBeforeTax", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome", "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Total Revenue", "label": "Revenue" } } }, "auth_ref": [ "r64", "r126", "r152", "r158", "r164", "r165", "r167", "r288", "r306", "r348", "r349" ] }, "ifrs-full_RevenueFromInterest": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "RevenueFromInterest", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_InterestIncomeExpenseNet1", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "totalLabel": "Interest, Dividend and Fee Income", "label": "Interest income" } }, "en": { "role": { "documentation": "The amount of income arising from interest." } } }, "auth_ref": [ "r67", "r153", "r162", "r376" ] }, "ifrs-full_ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ReverseRepurchaseAgreementsAndCashCollateralOnSecuritiesBorrowed", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Assets", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Securities Borrowed or Purchased Under Resale Agreements", "label": "Reverse repurchase agreements and cash collateral on securities borrowed" } }, "en": { "role": { "documentation": "The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]" } } }, "auth_ref": [ "r377" ] }, "ifrs-full_SaleOrIssueOfTreasuryShares": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SaleOrIssueOfTreasuryShares", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "verboseLabel": "Net premium (discount) on sale of treasury shares", "label": "Sale or issue of treasury shares" } }, "en": { "role": { "documentation": "The increase in equity resulting from the sale or issue of treasury shares. [Refer: Treasury shares]" } } }, "auth_ref": [ "r374" ] }, "bmo_SaleOrPurchaseOfTreasuryShares": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SaleOrPurchaseOfTreasuryShares", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "verboseLabel": "Treasury shares sold", "label": "Sale or Purchase of Treasury Shares", "documentation": "Sale or purchase of treasury\u00a0shares." } } }, "auth_ref": [] }, "ifrs-full_SalesFairValueMeasurementAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SalesFairValueMeasurementAssets", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Sales", "label": "Sales, fair value measurement, assets" } }, "en": { "role": { "documentation": "The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r76" ] }, "ifrs-full_SalesFairValueMeasurementLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SalesFairValueMeasurementLiabilities", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Sales", "label": "Sales, fair value measurement, liabilities" } }, "en": { "role": { "documentation": "The decrease in the fair value measurement of liabilities resulting from sales. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r76" ] }, "bmo_ScenarioWeighting": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ScenarioWeighting", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Scenario weight", "label": "Scenario Weighting", "documentation": "Scenario Weighting" } } }, "auth_ref": [] }, "bmo_ScheduleOfSecuritiesByClassificationExplanatoryTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ScheduleOfSecuritiesByClassificationExplanatoryTableTextBlock", "presentation": [ "http://www.bmo.com/role/SecuritiesTables" ], "lang": { "en-us": { "role": { "terseLabel": "Summary of Classification of Securities", "label": "Schedule Of Securities By Classification Explanatory [Table Text Block]", "documentation": "Schedule of securities by classification explanatory." } } }, "auth_ref": [] }, "bmo_ScheduleOfSecuritiesByClassificationLineItems": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ScheduleOfSecuritiesByClassificationLineItems", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Schedule of Securities By Classification [Line Items]", "label": "Schedule of Securities By Classification [Line Items]", "documentation": "Schedule of Securities By Classification [Line Items]" } } }, "auth_ref": [] }, "bmo_ScheduleOfSecuritiesByClassificationTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ScheduleOfSecuritiesByClassificationTable", "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Schedule Of Securities By Classification [Table]", "label": "Schedule Of Securities By Classification [Table]", "documentation": "Schedule Of Securities By Classification [Table]" } } }, "auth_ref": [] }, "bmo_Securities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "Securities", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Assets", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "totalLabel": "Securities (Note 2)", "label": "Securities", "documentation": "The amount of securities consisting of bonds, share certificates or other debt or equity ownership measured at either fair value through profit and loss, fair value through other comprehensive income or at amortized cost." } } }, "auth_ref": [] }, "bmo_SecuritiesAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritiesAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Securities (Note 2)", "terseLabel": "Securities", "label": "Securities [abstract]", "documentation": "Securities." } } }, "auth_ref": [] }, "bmo_SecuritiesAtAmortizedCostNetOfAllowances": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritiesAtAmortizedCostNetOfAllowances", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_Securities", "weight": 1.0, "order": 4.0 }, "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails": { "parentTag": "bmo_BankSecuritiesCarryingAmount", "weight": 1.0, "order": 4.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Debt securities at amortized cost", "terseLabel": "Amortized cost", "label": "Securities At Amortized Cost Net Of Allowances", "documentation": "Securities at amortized cost net of allowances." } } }, "auth_ref": [] }, "bmo_SecuritiesAtFairValueThroughOtherComprehensiveIncomeNetOfAllowances": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritiesAtFairValueThroughOtherComprehensiveIncomeNetOfAllowances", "crdr": "debit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails": { "parentTag": "bmo_BankSecuritiesCarryingAmount", "weight": 1.0, "order": 2.0 }, "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_Securities", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails", "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Fair value through other comprehensive income", "verboseLabel": "FVOCI Securities", "label": "Securities At Fair Value Through Other Comprehensive Income Net Of Allowances", "documentation": "Securities at fair value through other comprehensive income net of allowances." } } }, "auth_ref": [] }, "bmo_SecuritiesAtFairValueThroughOtherComprehensiveIncomeRealizedGains": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritiesAtFairValueThroughOtherComprehensiveIncomeRealizedGains", "crdr": "credit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails": { "parentTag": "bmo_SecuritiesGainsOtherThanTrading", "weight": 1.0, "order": 2.0 } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "FVOCI securities - net realized gains", "label": "Securities At Fair Value Through Other Comprehensive Income Realized Gains", "documentation": "Securities at fair value through other comprehensive income realized gains." } } }, "auth_ref": [] }, "bmo_SecuritiesGainsLossesOtherThanTrading": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritiesGainsLossesOtherThanTrading", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 11.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Securities gains, other than trading (Note 2)", "label": "Securities Gains Losses Other Than Trading", "documentation": "Securities gains (losses), other than trading." } } }, "auth_ref": [] }, "bmo_SecuritiesGainsOtherThanTrading": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritiesGainsOtherThanTrading", "crdr": "credit", "calculation": { "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails": { "parentTag": null, "weight": null, "order": null, "root": true } }, "presentation": [ "http://www.bmo.com/role/SecuritiesSummaryofNonInterestRevenueDetails" ], "lang": { "en-us": { "role": { "totalLabel": "Securities gains, other than trading", "label": "Securities gains, other than trading", "documentation": "Securities gains, other than trading." } } }, "auth_ref": [] }, "bmo_SecuritiesSoldButNotYetPurchased": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritiesSoldButNotYetPurchased", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousLiabilities", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Securities sold but not yet purchased", "label": "Securities Sold But Not Yet Purchased", "documentation": "The fair value of obligations to deliver securities not owned at the time of sale." } } }, "auth_ref": [] }, "bmo_SecuritiesSoldButNotYetPurchasedAtFairValue": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritiesSoldButNotYetPurchasedAtFairValue", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Securities sold but not yet purchased", "label": "Securities Sold But Not Yet Purchased at Fair Value", "documentation": "Securities Sold But Not Yet Purchased at Fair Value" } } }, "auth_ref": [] }, "bmo_SecuritizationAndStructuredEntitiesLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritizationAndStructuredEntitiesLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_OtherMiscellaneousLiabilities", "weight": 1.0, "order": 5.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Securitization and structured entities\u2019 liabilities", "label": "Securitization and structured entities' liabilities", "documentation": "The amount of liabilities associated with securitization programs and structured entities." } } }, "auth_ref": [] }, "bmo_SecuritizedLoansMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SecuritizedLoansMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofLoansthatarePastDuebutnotClassifiedasImpairedDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Securitized Loans", "label": "Securitized Loans [Member]", "documentation": "Securitized Loans" } } }, "auth_ref": [] }, "ifrs-full_SegmentsAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SegmentsAxis", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Segments [axis]", "label": "Segments [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r26", "r83", "r157", "r174", "r300", "r316" ] }, "ifrs-full_SegmentsDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SegmentsDomain", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Segments [domain]", "label": "Segments [domain]" } }, "en": { "role": { "documentation": "This member stands for all segments of an entity. It also represents the standard value for the 'Segments' axis if no other member is used." } } }, "auth_ref": [ "r26", "r83", "r163", "r174", "r300", "r316" ] }, "ifrs-full_SettlementsFairValueMeasurementAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SettlementsFairValueMeasurementAssets", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Maturities/Settlement", "label": "Settlements, fair value measurement, assets" } }, "en": { "role": { "documentation": "The decrease in the fair value measurement of assets resulting from settlements. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r76" ] }, "ifrs-full_SettlementsFairValueMeasurementLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SettlementsFairValueMeasurementLiabilities", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Maturities/Settlement", "label": "Settlements, fair value measurement, liabilities" } }, "en": { "role": { "documentation": "The decrease in the fair value measurement of liabilities resulting from settlements. [Refer: At fair value [member]]" } } }, "auth_ref": [ "r76" ] }, "bmo_SevenPointSevenPercentageLimitedRecourseCapitalNotesSeriesFourMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SevenPointSevenPercentageLimitedRecourseCapitalNotesSeriesFourMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "7.700% Limited Recourse Capital Notes, Series 4 (LRCNs, Series 4)", "label": "Seven Point Seven Percentage Limited Recourse Capital Notes Series Four [Member]", "documentation": "Seven point seven percentage limited recourse capital notes series four." } } }, "auth_ref": [] }, "bmo_SevenPointThreePercentageLimitedRecourseCapitalNotesSeriesFiveMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SevenPointThreePercentageLimitedRecourseCapitalNotesSeriesFiveMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "7.300% Limited Recourse Capital Notes, Series 5 (LRCNs, Series 5)", "label": "Seven Point Three Percentage Limited Recourse Capital Notes Series Five [Member]", "documentation": "Seven point three percentage limited recourse capital notes series five." } } }, "auth_ref": [] }, "bmo_SevenPointThreeTwoFivePercentageLimitedRecourseCapitalNotesSeriesThreeMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SevenPointThreeTwoFivePercentageLimitedRecourseCapitalNotesSeriesThreeMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "7.325% Limited Recourse Capital Notes, Series 3 (LRCNs, Series 3)", "label": "Seven Point Three Two Five Percentage Limited Recourse Capital Notes Series Three [Member]", "documentation": "Seven Point Three Two Five Percentage Limited Recourse Capital Notes Series Three" } } }, "auth_ref": [] }, "bmo_SevereDownsideScenarioMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SevereDownsideScenarioMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesAdditionalInformationDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Severe downside", "label": "Severe Downside Scenario [Member]", "documentation": "Severe downside scenario." } } }, "auth_ref": [] }, "ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 10.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Share of profit (loss) in associates and joint ventures", "label": "Share of profit (loss) of associates and joint ventures accounted for using equity method" } } }, "auth_ref": [ "r155", "r162", "r291" ] }, "ifrs-full_SharePremiumMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SharePremiumMember", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Contributed Surplus", "label": "Share premium [member]" } }, "en": { "role": { "documentation": "This member stands for the amount received or receivable from issuance of the entity's shares in excess of nominal value." } } }, "auth_ref": [ "r260" ] }, "bmo_ShareRepurchaseProgramAuthorizedAmount": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ShareRepurchaseProgramAuthorizedAmount", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Share repurchase program authorized amount", "label": "Share Repurchase Program Authorized Amount", "documentation": "Share repurchase program authorized amount." } } }, "auth_ref": [] }, "bmo_ShareRepurchaseProgramNumberOfSharesRepurchased": { "xbrltype": "sharesItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ShareRepurchaseProgramNumberOfSharesRepurchased", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Share repurchase program number of shares repurchased (in shares)", "label": "Share Repurchase Program Number Of Shares Repurchased", "documentation": "Share repurchase program number of shares repurchased." } } }, "auth_ref": [] }, "bmo_ShareRepurchaseProgramPricePerShare": { "xbrltype": "perShareItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "ShareRepurchaseProgramPricePerShare", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Share repurchase program price per share (in canadian dollars per share)", "label": "Share Repurchase Program Price Per Share", "documentation": "Share repurchase program price per share." } } }, "auth_ref": [] }, "bmo_SharesBuybackProgramAxis": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SharesBuybackProgramAxis", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Shares Buyback Program [Axis]", "label": "Shares Buyback Program [Axis]", "documentation": "Shares Buyback Program [Axis]" } } }, "auth_ref": [] }, "bmo_SharesBuybackProgramDomain": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SharesBuybackProgramDomain", "presentation": [ "http://www.bmo.com/role/EquityAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Shares Buyback Program [Domain]", "label": "Shares Buyback Program [Domain]", "documentation": "Shares Buyback Program [Domain]" } } }, "auth_ref": [] }, "ifrs-full_ShorttermDepositsNotClassifiedAsCashEquivalents": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "ShorttermDepositsNotClassifiedAsCashEquivalents", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Assets", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Interest Bearing Deposits with Banks", "label": "Short-term deposits, not classified as cash equivalents" } }, "en": { "role": { "documentation": "The amount of short-term deposits held by the entity that are not classified as cash equivalents. [Refer: Cash equivalents]" } } }, "auth_ref": [ "r377" ] }, "ifrs-full_SignificantInvestmentsInSubsidiariesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SignificantInvestmentsInSubsidiariesAxis", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Subsidiaries [axis]", "label": "Subsidiaries [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r16", "r18", "r70", "r239" ] }, "ifrs-full_SignificantInvestmentsInSubsidiariesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SignificantInvestmentsInSubsidiariesDomain", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Subsidiaries [domain]", "label": "Subsidiaries [domain]" } }, "en": { "role": { "documentation": "This member stands for the standard value for the 'Subsidiaries' axis if no other member is used." } } }, "auth_ref": [ "r16", "r18", "r70", "r239" ] }, "bmo_SixPointEightSevenFivePercentageLimitedRecourseCapitalNotesSeriesSixMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SixPointEightSevenFivePercentageLimitedRecourseCapitalNotesSeriesSixMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "6.875% Limited Recourse Capital Notes, Series 6 (LRCNs, Series 6)", "label": "Six Point Eight Seven Five Percentage Limited Recourse Capital Notes Series Six [Member]", "documentation": "Six Point Eight Seven Five Percentage Limited Recourse Capital Notes Series Six" } } }, "auth_ref": [] }, "bmo_SourceOfDepositAxis": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SourceOfDepositAxis", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Source Of Deposit [Axis]", "label": "Source Of Deposit [Axis]", "documentation": "Source of deposit." } } }, "auth_ref": [] }, "bmo_SourceOfDepositDomain": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SourceOfDepositDomain", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Source Of Deposit [Domain]", "label": "Source Of Deposit [Domain]", "documentation": "Source of deposit domain" } } }, "auth_ref": [] }, "bmo_StageOneMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StageOneMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Stage 1", "label": "Stage One [member]", "documentation": "Stage One [member]" } } }, "auth_ref": [] }, "bmo_StageThreeMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StageThreeMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Stage 3", "label": "Stage three [Member]", "documentation": "Stage three." } } }, "auth_ref": [] }, "bmo_StageTwoMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StageTwoMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Stage 2", "label": "Stage Two [Member]", "documentation": "Stage Two [Member]" } } }, "auth_ref": [] }, "bmo_StatementLineItems": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StatementLineItems", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical", "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Statement [Line Items]", "label": "Statement [Line Items]", "documentation": "Statement [Line Items]" } } }, "auth_ref": [] }, "bmo_StatementOfBalanceSheetTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StatementOfBalanceSheetTable", "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet" ], "lang": { "en-us": { "role": { "terseLabel": "Statement of Balance Sheet [Table]", "label": "Statement Of Balance Sheet [Table]", "documentation": "Statement Of Balance Sheet" } } }, "auth_ref": [] }, "ifrs-full_StatementOfCashFlowsAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "StatementOfCashFlowsAbstract", "lang": { "en-us": { "role": { "label": "Statement of cash flows [abstract]" } } }, "auth_ref": [] }, "ifrs-full_StatementOfChangesInEquityAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "StatementOfChangesInEquityAbstract", "lang": { "en-us": { "role": { "label": "Statement of changes in equity [abstract]" } } }, "auth_ref": [] }, "ifrs-full_StatementOfChangesInEquityTable": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "StatementOfChangesInEquityTable", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofChangesinEquity" ], "lang": { "en-us": { "role": { "terseLabel": "Statement of changes in equity [table]", "label": "Statement of changes in equity [table]" } }, "en": { "role": { "documentation": "Schedule disclosing information related to changes in equity." } } }, "auth_ref": [ "r260" ] }, "ifrs-full_StatementOfComprehensiveIncomeAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "StatementOfComprehensiveIncomeAbstract", "lang": { "en-us": { "role": { "label": "Statement of comprehensive income [abstract]" } } }, "auth_ref": [] }, "bmo_StatementOfComprehensiveIncomeTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StatementOfComprehensiveIncomeTable", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncome", "http://www.bmo.com/role/ConsolidatedStatementofComprehensiveIncomeParenthetical" ], "lang": { "en-us": { "role": { "terseLabel": "Statement Of Comprehensive Income [Table]", "label": "Statement Of Comprehensive Income [Table]", "documentation": "Statement Of Comprehensive Income" } } }, "auth_ref": [] }, "ifrs-full_StatementOfFinancialPositionAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "StatementOfFinancialPositionAbstract", "lang": { "en-us": { "role": { "label": "Statement of financial position [abstract]" } } }, "auth_ref": [] }, "bmo_StatementOfIncomeTable": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StatementOfIncomeTable", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Statement Of Income [Table]", "label": "Statement Of Income [Table]", "documentation": "Statement Of Income" } } }, "auth_ref": [] }, "bmo_StockOptionPlanMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StockOptionPlanMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Stock Option Plan", "label": "Stock Option Plan [member]", "documentation": "Stock Option Plan [member]" } } }, "auth_ref": [] }, "bmo_StonepeakPartnersLPNewlyCombinedEntityMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StonepeakPartnersLPNewlyCombinedEntityMember", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Stonepeak Partners LP Newly Combined Entity", "label": "Stonepeak Partners LP Newly Combined Entity [Member]", "documentation": "Stonepeak Partners LP Newly Combined Entity" } } }, "auth_ref": [] }, "bmo_StructuredNoteLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "StructuredNoteLiabilities", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Structured note liabilities", "label": "Structured Note Liabilities", "documentation": "Structured note liabilities." } } }, "auth_ref": [] }, "bmo_SubInvestmentGradeMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SubInvestmentGradeMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Sub-investment grade", "label": "Sub investment grade [member]", "documentation": "Sub investment grade." } } }, "auth_ref": [] }, "bmo_SubordinatedDebtMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SubordinatedDebtMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Subordinated Debt", "label": "Subordinated Debt [Member]", "documentation": "Subordinated Debt" } } }, "auth_ref": [] }, "ifrs-full_SubordinatedLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "SubordinatedLiabilities", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "ifrs-full_Liabilities", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFinancialInstrumentsDesignatedatFairValueThroughProfitorLossDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Subordinated Debt (Note 4)", "terseLabel": "Subordinated debt", "label": "Subordinated liabilities" } }, "en": { "role": { "documentation": "The amount of liabilities that are subordinate to other liabilities with respect to claims." } } }, "auth_ref": [ "r377" ] }, "bmo_SupplementalCashFlowDisclosureAbstract": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "SupplementalCashFlowDisclosureAbstract", "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofCashFlows" ], "lang": { "en-us": { "role": { "terseLabel": "Supplemental Disclosure of Cash Flow Information", "label": "Supplemental Cash Flow Disclosure [abstract]", "documentation": "Supplemental Cash Flow Disclosure [abstract]" } } }, "auth_ref": [] }, "bmo_TierOneCapital": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TierOneCapital", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Tier 1 Capital", "label": "Tier one capital", "documentation": "Tier one capital" } } }, "auth_ref": [] }, "bmo_TierOneCapitalRatio": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TierOneCapitalRatio", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Tier 1 Capital Ratio", "label": "Tier one capital ratio", "documentation": "Tier 1 capital dividend by Tier 1 capital risk-weighted assets." } } }, "auth_ref": [] }, "ifrs-full_TopOfRangeMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TopOfRangeMember", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails", "http://www.bmo.com/role/FairValueMeasurementsSignificantUnobservableInputsinLevel3InstrumentValuationsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "High", "label": "Top of range [member]" } }, "en": { "role": { "documentation": "This member stands for top of a range." } } }, "auth_ref": [ "r49", "r82", "r100", "r114", "r186", "r308", "r310", "r365" ] }, "bmo_TotalCapital": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TotalCapital", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Total Capital", "label": "Total Capital", "documentation": "Total Capital" } } }, "auth_ref": [] }, "bmo_TotalLossAbsorbingCapacity": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TotalLossAbsorbingCapacity", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "TLAC", "label": "Total Loss Absorbing Capacity", "documentation": "Total loss absorbing capacity." } } }, "auth_ref": [] }, "bmo_TotalLossAbsorbingCapacityCapitalRatio": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TotalLossAbsorbingCapacityCapitalRatio", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "TLAC Ratio", "label": "Total Loss Absorbing Capacity capital Ratio", "documentation": "Total loss absorbing capacity capital ratio." } } }, "auth_ref": [] }, "bmo_TotalLossAbsorbingCapacityLeverageRatio": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TotalLossAbsorbingCapacityLeverageRatio", "presentation": [ "http://www.bmo.com/role/CapitalManagementSummaryofRegulatoryCapitalMeasureandRiskWeightedAssetsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "TLAC Leverage Ratio", "label": "Total Loss Absorbing Capacity Leverage Ratio", "documentation": "Total loss absorbing capacity leverage ratio." } } }, "auth_ref": [] }, "ifrs-full_TradingIncomeExpense": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TradingIncomeExpense", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 3.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "verboseLabel": "Trading revenues", "label": "Trading income (expense)" } } }, "auth_ref": [ "r379" ] }, "bmo_TradingSecuritiesAtFairValueThroughProfitOrLoss": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TradingSecuritiesAtFairValueThroughProfitOrLoss", "crdr": "debit", "calculation": { "http://www.bmo.com/role/ConsolidatedBalanceSheet": { "parentTag": "bmo_Securities", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedBalanceSheet", "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Trading", "verboseLabel": "Trading Securities", "label": "Trading Securities At Fair Value Through Profit Or Loss", "documentation": "Trading securities at fair value through profit or loss." } } }, "auth_ref": [] }, "ifrs-full_TradingSecuritiesMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TradingSecuritiesMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails", "http://www.bmo.com/role/SecuritiesSummaryofClassificationofSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Trading Securities", "label": "Trading securities [member]" } }, "en": { "role": { "documentation": "This member stands for financial instruments that (a) are acquired or incurred principally for the purpose of selling or repurchasing it in the near term; or (b) on initial recognition are part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking. [Refer: Classes of financial instruments [domain]]" } } }, "auth_ref": [ "r324", "r335" ] }, "bmo_TransferToStageOneAllowanceAccountForCreditLossesOfFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TransferToStageOneAllowanceAccountForCreditLossesOfFinancialAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Transfer to Stage 1", "label": "Transfer to stage one allowance account for credit losses of financial assets", "documentation": "Transfer to stage one allowance account for credit losses of financial assets." } } }, "auth_ref": [] }, "ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TransfersIntoLevel3OfFairValueHierarchyAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Transfers into Level 3", "label": "Transfers into Level 3 of fair value hierarchy, assets" } }, "en": { "role": { "documentation": "The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]" } } }, "auth_ref": [ "r77" ] }, "ifrs-full_TransfersIntoLevel3OfFairValueHierarchyLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TransfersIntoLevel3OfFairValueHierarchyLiabilities", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Transfers into Level 3", "label": "Transfers into Level 3 of fair value hierarchy, liabilities" } }, "en": { "role": { "documentation": "The amount of transfers of liabilities into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]" } } }, "auth_ref": [ "r77" ] }, "ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyAssets": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TransfersOutOfLevel3OfFairValueHierarchyAssets", "crdr": "credit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Transfers out of Level 3", "label": "Transfers out of Level 3 of fair value hierarchy, assets" } }, "en": { "role": { "documentation": "The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]" } } }, "auth_ref": [ "r77" ] }, "ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyLiabilities": { "xbrltype": "monetaryItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TransfersOutOfLevel3OfFairValueHierarchyLiabilities", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofChangesinLevel3InstrumentsCarriedatFairValueDetails" ], "lang": { "en-us": { "role": { "negatedLabel": "Transfers out of Level 3", "label": "Transfers out of Level 3 of fair value hierarchy, liabilities" } }, "en": { "role": { "documentation": "The amount of transfers of liabilities out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]" } } }, "auth_ref": [ "r77" ] }, "bmo_TransfersToStageThreeAllowanceAccountForCreditLossesOfFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TransfersToStageThreeAllowanceAccountForCreditLossesOfFinancialAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Transfer to Stage 3", "label": "Transfers to stage three allowance account for credit losses of financial assets", "documentation": "Transfers to stage three allowance account for credit losses of financial assets." } } }, "auth_ref": [] }, "bmo_TransfersToStageTwoAllowanceAccountForCreditLossesOfFinancialAssets": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TransfersToStageTwoAllowanceAccountForCreditLossesOfFinancialAssets", "crdr": "debit", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofContinuityinLossAllowancebyEachProductTypeDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Transfer to Stage 2", "label": "Transfers to stage two allowance account for credit losses of financial assets", "documentation": "Transfers to stage two allowance account for credit losses of financial assets." } } }, "auth_ref": [] }, "ifrs-full_TreasurySharesMember": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TreasurySharesMember", "presentation": [ "http://www.bmo.com/role/EquitySummaryofClassesofPreferredandCommonSharesOutstandingDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Treasury shares", "label": "Treasury shares [member]" } }, "en": { "role": { "documentation": "This member stands for the entity\u2019s own equity instruments, held by the entity or other members of the consolidated group." } } }, "auth_ref": [ "r260" ] }, "ifrs-full_TypesOfFinancialLiabilitiesAxis": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TypesOfFinancialLiabilitiesAxis", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Types of financial liabilities [axis]", "label": "Types of financial liabilities [axis]" } }, "en": { "role": { "documentation": "The axis of a table defines the relationship between the members in the table and the line items or concepts that complete the table." } } }, "auth_ref": [ "r150", "r151" ] }, "ifrs-full_TypesOfFinancialLiabilitiesDomain": { "xbrltype": "domainItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "TypesOfFinancialLiabilitiesDomain", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Types of financial liabilities [domain]", "label": "Types of financial liabilities [domain]" } }, "en": { "role": { "documentation": "This member stands for aggregated types of financial liabilities. It also represents the standard value for the 'Types of financial liabilities' axis if no other member is used. [Refer: Financial assets]" } } }, "auth_ref": [ "r150", "r151" ] }, "bmo_TypesOfShareBasedPaymentArrangementsUsedToCalculateDilutiveEPSAxis": { "xbrltype": "stringItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TypesOfShareBasedPaymentArrangementsUsedToCalculateDilutiveEPSAxis", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Types of share based payment arrangements used to calculate dilutive EPS [Axis]", "label": "Types of share based payment arrangements used to calculate dilutive EPS [Axis]", "documentation": "Types of share based payment arrangements used to calculate dilutive EPS [Axis]" } } }, "auth_ref": [] }, "bmo_TypesOfShareBasedPaymentArrangementsUsedToCalculateDilutiveEPSDomain": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "TypesOfShareBasedPaymentArrangementsUsedToCalculateDilutiveEPSDomain", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Types of share based payment arrangements used to calculate dilutive EPS [Domain]", "label": "Types of share based payment arrangements used to calculate dilutive EPS [Domain]", "documentation": "Types of share based payment arrangements used to calculate dilutive EPS [Domain]" } } }, "auth_ref": [] }, "country_US": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/country/2025", "localname": "US", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails", "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsPayableonaFixedDetails", "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "United States", "verboseLabel": "United States", "label": "UNITED STATES" } } }, "auth_ref": [] }, "bmo_USDollarsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "USDollarsMember", "presentation": [ "http://www.bmo.com/role/DepositsandSubordinatedDebtSummaryofDepositsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "U.S. dollars", "label": "U.S. dollars [member]", "documentation": "U.S. dollars." } } }, "auth_ref": [] }, "bmo_USStateMunicipalAndAgenciesDebtMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "USStateMunicipalAndAgenciesDebtMember", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "U.S. states, municipalities and agencies", "verboseLabel": "U.S. states, municipalities and agencies", "label": "US State Municipal And Agencies Debt [member]", "documentation": "US state municipal and agencies debt." } } }, "auth_ref": [] }, "bmo_UnderwritingAndAdvisoryFeesIncome": { "xbrltype": "monetaryItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "UnderwritingAndAdvisoryFeesIncome", "crdr": "credit", "calculation": { "http://www.bmo.com/role/ConsolidatedStatementofIncome": { "parentTag": "bmo_NonInterestIncome1", "weight": 1.0, "order": 8.0 } }, "presentation": [ "http://www.bmo.com/role/ConsolidatedStatementofIncome" ], "lang": { "en-us": { "role": { "terseLabel": "Underwriting and advisory fees", "label": "Underwriting And Advisory Fees Income", "documentation": "Underwriting and advisory fees income." } } }, "auth_ref": [] }, "bmo_UnemploymentRate": { "xbrltype": "percentItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "UnemploymentRate", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Unemployment rates", "label": "Unemployment rate", "documentation": "Unemployment rate." } } }, "auth_ref": [] }, "bmo_UnitedStatesFederalGovernmentSecuritiesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "UnitedStatesFederalGovernmentSecuritiesMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "U.S. federal government", "label": "United States Federal Government Securities [member]", "documentation": "United States Federal Government Securities [member]" } } }, "auth_ref": [] }, "bmo_UnitedStatesPersonalAndCommercialBankingMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "UnitedStatesPersonalAndCommercialBankingMember", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "terseLabel": "U.S. Banking", "label": "United States Personal and Commercial Banking[Member]", "documentation": "United States Personal and Commercial Banking[Member]" } } }, "auth_ref": [] }, "bmo_UpsideScenariosMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "UpsideScenariosMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofKeyEconomicVariablesUsedtoEstimateAllowanceonPerformingLoansDuringForecastPeriodDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Upside", "label": "Upside Scenarios [Member]", "documentation": "Upside scenarios." } } }, "auth_ref": [] }, "bmo_UsFederalGovernmentMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "UsFederalGovernmentMember", "presentation": [ "http://www.bmo.com/role/SecuritiesScheduleofUnrealizedGainsandLossesDetails", "http://www.bmo.com/role/SecuritiesSummaryofAmortizedCostSecuritiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "U.S. federal government", "verboseLabel": "U.S. federal government", "label": "US federal Government[Member]", "documentation": "US federal Government." } } }, "auth_ref": [] }, "bmo_UsStatesMunicipalitiesAndAgenciesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "UsStatesMunicipalitiesAndAgenciesMember", "presentation": [ "http://www.bmo.com/role/FairValueMeasurementsSummaryofFairValueMeasurementofAssetsandLiabilitiesDetails" ], "lang": { "en-us": { "role": { "terseLabel": "U.S. states, municipalities and agencies", "label": "US States, municipalities and agencies [Member]", "documentation": "US States, municipalities and agencies." } } }, "auth_ref": [] }, "ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill": { "xbrltype": "durationItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill", "presentation": [ "http://www.bmo.com/role/AcquisitionsandDivestituresAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Amortisation of intangible assets", "label": "Useful life measured as period of time, intangible assets other than goodwill" } }, "en": { "role": { "documentation": "The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]" } } }, "auth_ref": [ "r31", "r207" ] }, "bmo_VeryLowProbabilityOfDefaultMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "VeryLowProbabilityOfDefaultMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Very low", "label": "Very low probability of default [member]", "documentation": "Very low probability of default." } } }, "auth_ref": [] }, "bmo_WatchListMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "WatchListMember", "presentation": [ "http://www.bmo.com/role/LoansandAllowanceforCreditLossesSummaryofCreditRiskExposuresforLoansCarriedatAmortizedCostFVOCIorFVTPLDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Watchlist", "label": "Watch list [member]", "documentation": "Watch list." } } }, "auth_ref": [] }, "bmo_WealthManagementMember": { "xbrltype": "domainItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "WealthManagementMember", "presentation": [ "http://www.bmo.com/role/OperatingSegmentationSummaryofAverageAssetsGroupedbyOperatingSegmentDetails" ], "lang": { "en-us": { "role": { "verboseLabel": "Wealth Management", "label": "Wealth management [member]", "documentation": "Wealth management." } } }, "auth_ref": [] }, "bmo_WeightedAverageExercisePriceOfAverageOutstandingShareOptionsExcludedFromCalculationOfDilutedEarningsPerShare": { "xbrltype": "perShareItemType", "nsuri": "http://www.bmo.com/20260430", "localname": "WeightedAverageExercisePriceOfAverageOutstandingShareOptionsExcludedFromCalculationOfDilutedEarningsPerShare", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Weighted-average exercise price (in canadian dollars per share)", "label": "Weighted Average Exercise Price Of Average Outstanding Share Options Excluded From Calculation Of Diluted Earnings Per Share", "documentation": "Weighted average exercise price of average outstanding share options excluded from calculation of diluted earnings per share." } } }, "auth_ref": [] }, "ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019": { "xbrltype": "perShareItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationSummaryofRangesofValuesusedforeachOptionPricingAssumptionDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Exercise price", "label": "Weighted average exercise price of share options granted in share-based payment arrangement" } }, "en": { "role": { "documentation": "The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]" } } }, "auth_ref": [ "r112", "r218" ] }, "ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019": { "xbrltype": "perShareItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "WeightedAverageSharePriceShareOptionsGranted2019", "presentation": [ "http://www.bmo.com/role/EmployeeCompensationShareBasedCompensationAdditionalInformationDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Weighted average fair value of options granted (in canadian dollars per share)", "label": "Weighted average share price, share options granted" } }, "en": { "role": { "documentation": "The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]" } } }, "auth_ref": [ "r115" ] }, "ifrs-full_WeightedAverageShares": { "xbrltype": "sharesItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "WeightedAverageShares", "calculation": { "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails": { "parentTag": "ifrs-full_AdjustedWeightedAverageShares", "weight": 1.0, "order": 1.0 } }, "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Weighted-average number of common shares outstanding (in shares)", "verboseLabel": "Weighted-average number of common shares outstanding (in shares)", "label": "Weighted average number of ordinary shares used in calculating basic earnings per share" } }, "en": { "role": { "documentation": "The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor." } } }, "auth_ref": [ "r22" ] }, "ifrs-full_WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract": { "xbrltype": "stringItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract", "presentation": [ "http://www.bmo.com/role/EarningsPerShareSummaryofBasicandDilutedEarningsPerShareDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Dilutive impact of stock options", "label": "Weighted average ordinary shares used in calculating basic and diluted earnings per share [abstract]" } } }, "auth_ref": [] }, "ifrs-full_YieldUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItems": { "xbrltype": "percentItemType", "nsuri": "https://xbrl.ifrs.org/taxonomy/2025-03-27/ifrs-full", "localname": "YieldUsedToDiscountCashFlowsThatDoNotVaryBasedOnReturnsOnUnderlyingItems", "presentation": [ "http://www.bmo.com/role/InsuranceSummaryofYieldCurveUsedtoDiscountCashFlowsthatdonotVaryBasedonUnderlyingItemsDetails" ], "lang": { "en-us": { "role": { "terseLabel": "Yield used to discount cash flows that do not vary based on returns on underlying items", "label": "Yield used to discount cash flows that do not vary based on returns on underlying items" } }, "en": { "role": { "documentation": "The yield used to discount cash flows that do not vary based on the returns on underlying items, applying paragraph 36 of IFRS 17. Underlying items are items that determine some of the amounts payable to a policyholder. Underlying items can comprise any items; for example a reference portfolio of assets, the net assets of the entity, or a specified subset of the net assets of the entity." } } }, "auth_ref": [ "r100" ] } } } }, "std_ref": { "r0": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "10", "IssueDate": "2025-01-01", "Paragraph": "21", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=10&code=ifrs-tx-2025-en-r&anchor=para_21&doctype=Standard", "URIDate": "2025-03-27" }, "r1": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "79", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_79&doctype=Standard", "URIDate": "2025-03-27" }, "r2": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "81", "Subparagraph": "ab", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_ab&doctype=Standard", "URIDate": "2025-03-27" }, "r3": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "81", "Subparagraph": "c", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_c_i&doctype=Standard", "URIDate": "2025-03-27" }, "r4": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "81", "Subparagraph": "c", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_c_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r5": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "81", "Subparagraph": "g", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_g_i&doctype=Standard", "URIDate": "2025-03-27" }, "r6": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "12", "IssueDate": "2025-01-01", "Section": "Disclosure", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&doctype=Standard&dita_xref=IAS12_g79-88_TI", "URIDate": "2025-03-27" }, "r7": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "16", "IssueDate": "2025-01-01", "Paragraph": "73", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_d&doctype=Standard", "URIDate": "2025-03-27" }, "r8": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "16", "IssueDate": "2025-01-01", "Paragraph": "73", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e&doctype=Standard", "URIDate": "2025-03-27" }, "r9": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "138", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_138&doctype=Standard", "URIDate": "2025-03-27" }, "r10": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "141", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_b&doctype=Standard", "URIDate": "2025-03-27" }, "r11": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "142", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_142&doctype=Standard", "URIDate": "2025-03-27" }, "r12": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "53", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_53&doctype=Standard", "URIDate": "2025-03-27" }, "r13": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "21", "IssueDate": "2025-01-01", "Paragraph": "52", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2025-en-r&anchor=para_52_a&doctype=Standard", "URIDate": "2025-03-27" }, "r14": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "26", "IssueDate": "2025-01-01", "Paragraph": "35", "Subparagraph": "b", "Clause": "viii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=26&code=ifrs-tx-2025-en-r&anchor=para_35_b_viii&doctype=Standard", "URIDate": "2025-03-27" }, "r15": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "27", "IssueDate": "2025-01-01", "Paragraph": "16", "Subparagraph": "b", "Clause": "iii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_16_b_iii&doctype=Standard", "URIDate": "2025-03-27" }, "r16": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "27", "IssueDate": "2025-01-01", "Paragraph": "16", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_16_b&doctype=Standard", "URIDate": "2025-03-27" }, "r17": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "27", "IssueDate": "2025-01-01", "Paragraph": "17", "Subparagraph": "b", "Clause": "iii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_17_b_iii&doctype=Standard", "URIDate": "2025-03-27" }, "r18": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "27", "IssueDate": "2025-01-01", "Paragraph": "17", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2025-en-r&anchor=para_17_b&doctype=Standard", "URIDate": "2025-03-27" }, "r19": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "33", "IssueDate": "2025-01-01", "Paragraph": "66", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard", "URIDate": "2025-03-27" }, "r20": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "33", "IssueDate": "2025-01-01", "Paragraph": "67", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_67&doctype=Standard", "URIDate": "2025-03-27" }, "r21": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "33", "IssueDate": "2025-01-01", "Paragraph": "70", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_a&doctype=Standard", "URIDate": "2025-03-27" }, "r22": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "33", "IssueDate": "2025-01-01", "Paragraph": "70", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard", "URIDate": "2025-03-27" }, "r23": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "33", "IssueDate": "2025-01-01", "Section": "Disclosure", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&doctype=Standard&dita_xref=IAS33_g70-73A_TI", "URIDate": "2025-03-27" }, "r24": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "34", "IssueDate": "2025-01-01", "Paragraph": "16A", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=34&code=ifrs-tx-2025-en-r&anchor=para_16A_f&doctype=Standard", "URIDate": "2025-03-27" }, "r25": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "36", "IssueDate": "2025-01-01", "Paragraph": "126", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_126&doctype=Standard", "URIDate": "2025-03-27" }, "r26": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "36", "IssueDate": "2025-01-01", "Paragraph": "130", "Subparagraph": "d", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_130_d_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r27": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "36", "IssueDate": "2025-01-01", "Paragraph": "130", "Subparagraph": "f", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_130_f_i&doctype=Standard", "URIDate": "2025-03-27" }, "r28": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "36", "IssueDate": "2025-01-01", "Paragraph": "134", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_a&doctype=Standard", "URIDate": "2025-03-27" }, "r29": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "36", "IssueDate": "2025-01-01", "Paragraph": "134", "Subparagraph": "e", "Clause": "iiA", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_e_iiA&doctype=Standard", "URIDate": "2025-03-27" }, "r30": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "36", "IssueDate": "2025-01-01", "Paragraph": "135", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_135_a&doctype=Standard", "URIDate": "2025-03-27" }, "r31": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "38", "IssueDate": "2025-01-01", "Paragraph": "118", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_a&doctype=Standard", "URIDate": "2025-03-27" }, "r32": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "38", "IssueDate": "2025-01-01", "Paragraph": "118", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_c&doctype=Standard", "URIDate": "2025-03-27" }, "r33": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "38", "IssueDate": "2025-01-01", "Paragraph": "118", "Subparagraph": "e", "Clause": "vi", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_e_vi&doctype=Standard", "URIDate": "2025-03-27" }, "r34": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "38", "IssueDate": "2025-01-01", "Paragraph": "118", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_e&doctype=Standard", "URIDate": "2025-03-27" }, "r35": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "39", "IssueDate": "2025-01-01", "Paragraph": "102", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=39&code=ifrs-tx-2025-en-r&anchor=para_102_a&doctype=Standard", "URIDate": "2025-03-27" }, "r36": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "40", "IssueDate": "2025-01-01", "Paragraph": "32A", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_32A&doctype=Standard", "URIDate": "2025-03-27" }, "r37": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "40", "IssueDate": "2025-01-01", "Paragraph": "76", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_76&doctype=Standard", "URIDate": "2025-03-27" }, "r38": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "40", "IssueDate": "2025-01-01", "Paragraph": "79", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_79_c&doctype=Standard", "URIDate": "2025-03-27" }, "r39": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "40", "IssueDate": "2025-01-01", "Paragraph": "79", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_79_d&doctype=Standard", "URIDate": "2025-03-27" }, "r40": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "41", "IssueDate": "2025-01-01", "Paragraph": "50", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=41&code=ifrs-tx-2025-en-r&anchor=para_50&doctype=Standard", "URIDate": "2025-03-27" }, "r41": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "41", "IssueDate": "2025-01-01", "Paragraph": "54", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=41&code=ifrs-tx-2025-en-r&anchor=para_54_f&doctype=Standard", "URIDate": "2025-03-27" }, "r42": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "10", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_10&doctype=Standard", "URIDate": "2025-03-27" }, "r43": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "25", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard", "URIDate": "2025-03-27" }, "r44": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "28", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_28&doctype=Standard", "URIDate": "2025-03-27" }, "r45": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "31", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_31&doctype=Standard", "URIDate": "2025-03-27" }, "r46": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35&doctype=Standard", "URIDate": "2025-03-27" }, "r47": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "39", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_39&doctype=Standard", "URIDate": "2025-03-27" }, "r48": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "40", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_40_c&doctype=Standard", "URIDate": "2025-03-27" }, "r49": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "44H", "Subparagraph": "b", "Clause": "iii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_44H_b_iii&doctype=Standard", "URIDate": "2025-03-27" }, "r50": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "45", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_45&doctype=Standard", "URIDate": "2025-03-27" }, "r51": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "50", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_50_d&doctype=Standard", "URIDate": "2025-03-27" }, "r52": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IAS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "28", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28&doctype=Standard", "URIDate": "2025-03-27" }, "r53": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "24", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2025-en-r&anchor=para_24_a&doctype=Standard", "URIDate": "2025-03-27" }, "r54": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "24", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2025-en-r&anchor=para_24_b&doctype=Standard", "URIDate": "2025-03-27" }, "r55": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "32", "Subparagraph": "a", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2025-en-r&anchor=para_32_a_i&doctype=Standard", "URIDate": "2025-03-27" }, "r56": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "32", "Subparagraph": "a", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2025-en-r&anchor=para_32_a_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r57": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "10", "IssueDate": "2025-01-01", "Paragraph": "22", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=10&code=ifrs-tx-2025-en-r&anchor=para_22&doctype=Standard", "URIDate": "2025-03-27" }, "r58": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "12", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_12_e&doctype=Standard", "URIDate": "2025-03-27" }, "r59": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "12", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_12_f&doctype=Standard", "URIDate": "2025-03-27" }, "r60": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "19B", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_19B_c&doctype=Standard", "URIDate": "2025-03-27" }, "r61": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "21", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_21_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r62": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B10", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B10_a&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r63": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B12", "Subparagraph": "b", "Clause": "ix", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B12_b_ix&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r64": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B12", "Subparagraph": "b", "Clause": "v", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B12_b_v&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r65": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B12", "Subparagraph": "b", "Clause": "viii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B12_b_viii&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r66": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B13", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r67": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B13", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B13_e&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r68": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B13", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B13_f&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r69": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B13", "Subparagraph": "g", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B13_g&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r70": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B4", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B4_a&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r71": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_a&doctype=Standard", "URIDate": "2025-03-27" }, "r72": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_b&doctype=Standard", "URIDate": "2025-03-27" }, "r73": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_d&doctype=Standard", "URIDate": "2025-03-27" }, "r74": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "e", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e_i&doctype=Standard", "URIDate": "2025-03-27" }, "r75": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "e", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r76": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "e", "Clause": "iii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e_iii&doctype=Standard", "URIDate": "2025-03-27" }, "r77": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "e", "Clause": "iv", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e_iv&doctype=Standard", "URIDate": "2025-03-27" }, "r78": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e&doctype=Standard", "URIDate": "2025-03-27" }, "r79": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_f&doctype=Standard", "URIDate": "2025-03-27" }, "r80": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "93", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93&doctype=Standard", "URIDate": "2025-03-27" }, "r81": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Section": "Disclosure", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&doctype=Standard&dita_xref=IFRS13_g91-99_TI", "URIDate": "2025-03-27" }, "r82": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "14", "IssueDate": "2025-01-01", "Paragraph": "33", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=14&code=ifrs-tx-2025-en-r&anchor=para_33_b&doctype=Standard", "URIDate": "2025-03-27" }, "r83": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "15", "IssueDate": "2025-01-01", "Paragraph": "115", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2025-en-r&anchor=para_115&doctype=Standard", "URIDate": "2025-03-27" }, "r84": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "15", "IssueDate": "2025-01-01", "Paragraph": "120", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2025-en-r&anchor=para_120_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r85": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "16", "IssueDate": "2025-01-01", "Paragraph": "53", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_53&doctype=Standard", "URIDate": "2025-03-27" }, "r86": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "16", "IssueDate": "2025-01-01", "Paragraph": "94", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_94&doctype=Standard", "URIDate": "2025-03-27" }, "r87": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "16", "IssueDate": "2025-01-01", "Paragraph": "97", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_97&doctype=Standard", "URIDate": "2025-03-27" }, "r88": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "100", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_100_a&doctype=Standard", "URIDate": "2025-03-27" }, "r89": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "100", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_100_c&doctype=Standard", "URIDate": "2025-03-27" }, "r90": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "100", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_100&doctype=Standard", "URIDate": "2025-03-27" }, "r91": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "103", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_103&doctype=Standard", "URIDate": "2025-03-27" }, "r92": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "104", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_104&doctype=Standard", "URIDate": "2025-03-27" }, "r93": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "105", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_105_a&doctype=Standard", "URIDate": "2025-03-27" }, "r94": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "105", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_105_c&doctype=Standard", "URIDate": "2025-03-27" }, "r95": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "105", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_105_d&doctype=Standard", "URIDate": "2025-03-27" }, "r96": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "106", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_106&doctype=Standard", "URIDate": "2025-03-27" }, "r97": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "107", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_107&doctype=Standard", "URIDate": "2025-03-27" }, "r98": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "109", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_109&doctype=Standard", "URIDate": "2025-03-27" }, "r99": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "109A", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_109A&doctype=Standard", "URIDate": "2025-03-27" }, "r100": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "120", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_120&doctype=Standard", "URIDate": "2025-03-27" }, "r101": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "128", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_128_a&doctype=Standard", "URIDate": "2025-03-27" }, "r102": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "130", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_130&doctype=Standard", "URIDate": "2025-03-27" }, "r103": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "131", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_131_a&doctype=Standard", "URIDate": "2025-03-27" }, "r104": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "132", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_132_b&doctype=Standard", "URIDate": "2025-03-27" }, "r105": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "80", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_80_a&doctype=Standard", "URIDate": "2025-03-27" }, "r106": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "86", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_86&doctype=Standard", "URIDate": "2025-03-27" }, "r107": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "98", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_98&doctype=Standard", "URIDate": "2025-03-27" }, "r108": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "99", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_99_b&doctype=Standard", "URIDate": "2025-03-27" }, "r109": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "C32", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_C32&doctype=Appendix&subtype=C", "URIDate": "2025-03-27" }, "r110": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Section": "Disclosure", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&doctype=Standard&dita_xref=IFRS17_g93-132_TI", "URIDate": "2025-03-27" }, "r111": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "2", "IssueDate": "2025-01-01", "Paragraph": "44", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_44&doctype=Standard", "URIDate": "2025-03-27" }, "r112": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "2", "IssueDate": "2025-01-01", "Paragraph": "45", "Subparagraph": "b", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_b_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r113": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "2", "IssueDate": "2025-01-01", "Paragraph": "45", "Subparagraph": "b", "Clause": "vii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_b_vii&doctype=Standard", "URIDate": "2025-03-27" }, "r114": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "2", "IssueDate": "2025-01-01", "Paragraph": "45", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_45_d&doctype=Standard", "URIDate": "2025-03-27" }, "r115": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "2", "IssueDate": "2025-01-01", "Paragraph": "47", "Subparagraph": "a", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_a_i&doctype=Standard", "URIDate": "2025-03-27" }, "r116": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "2", "IssueDate": "2025-01-01", "Paragraph": "47", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_a&doctype=Standard", "URIDate": "2025-03-27" }, "r117": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B64", "Subparagraph": "f", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_f_i&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r118": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B64", "Subparagraph": "f", "Clause": "iv", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_f_iv&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r119": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B64", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_f&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r120": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B64", "Subparagraph": "g", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_g_i&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r121": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B64", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r122": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B67", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r123": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B67", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r124": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B67", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r125": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Section": "Disclosures application of paragraphs 59 and 61", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&doctype=Appendix&subtype=B&dita_xref=IFRS03_gB64-B67_TI", "URIDate": "2025-03-27" }, "r126": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "5", "IssueDate": "2025-01-01", "Paragraph": "33", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2025-en-r&anchor=para_33_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r127": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "20", "Subparagraph": "a", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_20_a_i&doctype=Standard", "URIDate": "2025-03-27" }, "r128": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "23B", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_23B_a&doctype=Standard", "URIDate": "2025-03-27" }, "r129": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "24C", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24C_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r130": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "24C", "Subparagraph": "b", "Clause": "iv", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24C_b_iv&doctype=Standard", "URIDate": "2025-03-27" }, "r131": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "24E", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24E_a&doctype=Standard", "URIDate": "2025-03-27" }, "r132": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "25", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard", "URIDate": "2025-03-27" }, "r133": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "31", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_31&doctype=Standard", "URIDate": "2025-03-27" }, "r134": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35H", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35H&doctype=Standard", "URIDate": "2025-03-27" }, "r135": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35I", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35I&doctype=Standard", "URIDate": "2025-03-27" }, "r136": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35K", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35K&doctype=Standard", "URIDate": "2025-03-27" }, "r137": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35M", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35M&doctype=Standard", "URIDate": "2025-03-27" }, "r138": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "36", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_36&doctype=Standard", "URIDate": "2025-03-27" }, "r139": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "42E", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_42E_e&doctype=Standard", "URIDate": "2025-03-27" }, "r140": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "42I", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_42I&doctype=Standard", "URIDate": "2025-03-27" }, "r141": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "6", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_6&doctype=Standard", "URIDate": "2025-03-27" }, "r142": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "7", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard", "URIDate": "2025-03-27" }, "r143": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "8", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_a&doctype=Standard", "URIDate": "2025-03-27" }, "r144": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "8", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_e&doctype=Standard", "URIDate": "2025-03-27" }, "r145": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "8", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_f&doctype=Standard", "URIDate": "2025-03-27" }, "r146": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "8", "Subparagraph": "h", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_h&doctype=Standard", "URIDate": "2025-03-27" }, "r147": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "8", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8&doctype=Standard", "URIDate": "2025-03-27" }, "r148": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B11E", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B11E&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r149": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B2", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B2_a&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r150": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B51", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B51&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r151": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B52", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B52&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r152": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "23", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23_a&doctype=Standard", "URIDate": "2025-03-27" }, "r153": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "23", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23_c&doctype=Standard", "URIDate": "2025-03-27" }, "r154": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "23", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23_d&doctype=Standard", "URIDate": "2025-03-27" }, "r155": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "23", "Subparagraph": "g", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23_g&doctype=Standard", "URIDate": "2025-03-27" }, "r156": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "23", "Subparagraph": "h", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23_h&doctype=Standard", "URIDate": "2025-03-27" }, "r157": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "23", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23&doctype=Standard", "URIDate": "2025-03-27" }, "r158": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "28", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_a&doctype=Standard", "URIDate": "2025-03-27" }, "r159": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "28", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_b&doctype=Standard", "URIDate": "2025-03-27" }, "r160": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "28", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_c&doctype=Standard", "URIDate": "2025-03-27" }, "r161": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "28", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_d&doctype=Standard", "URIDate": "2025-03-27" }, "r162": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "28", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_e&doctype=Standard", "URIDate": "2025-03-27" }, "r163": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "28", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28&doctype=Standard", "URIDate": "2025-03-27" }, "r164": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "32", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_32&doctype=Standard", "URIDate": "2025-03-27" }, "r165": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "33", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_33_a&doctype=Standard", "URIDate": "2025-03-27" }, "r166": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "33", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_33&doctype=Standard", "URIDate": "2025-03-27" }, "r167": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "34", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_34&doctype=Standard", "URIDate": "2025-03-27" }, "r168": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Section": "Disclosure", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&doctype=Standard&dita_xref=IFRS08_g20-24_TI", "URIDate": "2025-03-27" }, "r169": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "6.5.13", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_6.5.13_a&doctype=Standard", "URIDate": "2025-03-27" }, "r170": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.34", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.34&doctype=Standard", "URIDate": "2025-03-27" }, "r171": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.42", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.42&doctype=Standard", "URIDate": "2025-03-27" }, "r172": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2026-01-01", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "20B", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_20B&doctype=Standard", "URIDate": "2025-03-27" }, "r173": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2026-01-01", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "30A", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_30A_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r174": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "104", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_104&doctype=Standard", "URIDate": "2025-03-27" }, "r175": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "108", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_108_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r176": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "115", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_115&doctype=Standard", "URIDate": "2025-03-27" }, "r177": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "122", "Subparagraph": "a", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_122_a_i&doctype=Standard", "URIDate": "2025-03-27" }, "r178": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "122", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_122_a&doctype=Standard", "URIDate": "2025-03-27" }, "r179": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "124", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_124_a&doctype=Standard", "URIDate": "2025-03-27" }, "r180": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "124", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_124&doctype=Standard", "URIDate": "2025-03-27" }, "r181": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "133", "Subparagraph": "a", "Clause": "iii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_133_a_iii&doctype=Standard", "URIDate": "2025-03-27" }, "r182": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "138", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_138&doctype=Standard", "URIDate": "2025-03-27" }, "r183": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "160", "Subparagraph": "a", "Clause": "iv", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_160_a_iv&doctype=Standard", "URIDate": "2025-03-27" }, "r184": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "160", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_160_a&doctype=Standard", "URIDate": "2025-03-27" }, "r185": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "160", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_160&doctype=Standard", "URIDate": "2025-03-27" }, "r186": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "168", "Subparagraph": "b", "Clause": "iii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_168_b_iii&doctype=Standard", "URIDate": "2025-03-27" }, "r187": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "169", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_169&doctype=Standard", "URIDate": "2025-03-27" }, "r188": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "178", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_178&doctype=Standard", "URIDate": "2025-03-27" }, "r189": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "190", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_190&doctype=Standard", "URIDate": "2025-03-27" }, "r190": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "192", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_192&doctype=Standard", "URIDate": "2025-03-27" }, "r191": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "194", "Subparagraph": "c", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_c_i&doctype=Standard", "URIDate": "2025-03-27" }, "r192": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "194", "Subparagraph": "c", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_c_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r193": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "194", "Subparagraph": "f", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_194_f_i&doctype=Standard", "URIDate": "2025-03-27" }, "r194": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "200", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_200_d&doctype=Standard", "URIDate": "2025-03-27" }, "r195": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "200", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_200_e&doctype=Standard", "URIDate": "2025-03-27" }, "r196": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "203", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_203&doctype=Standard", "URIDate": "2025-03-27" }, "r197": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "204", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_204&doctype=Standard", "URIDate": "2025-03-27" }, "r198": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "207", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_b&doctype=Standard", "URIDate": "2025-03-27" }, "r199": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "218", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_218_a&doctype=Standard", "URIDate": "2025-03-27" }, "r200": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "24", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_24_a&doctype=Standard", "URIDate": "2025-03-27" }, "r201": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "24", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_24_b&doctype=Standard", "URIDate": "2025-03-27" }, "r202": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "246", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_246_f&doctype=Standard", "URIDate": "2025-03-27" }, "r203": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "250", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_250&doctype=Standard", "URIDate": "2025-03-27" }, "r204": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "254", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_a&doctype=Standard", "URIDate": "2025-03-27" }, "r205": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "254", "Subparagraph": "e", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_e_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r206": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "255", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_255_a&doctype=Standard", "URIDate": "2025-03-27" }, "r207": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "263", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_a&doctype=Standard", "URIDate": "2025-03-27" }, "r208": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "263", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_c&doctype=Standard", "URIDate": "2025-03-27" }, "r209": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "263", "Subparagraph": "e", "Clause": "vi", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e_vi&doctype=Standard", "URIDate": "2025-03-27" }, "r210": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "263", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_263_e&doctype=Standard", "URIDate": "2025-03-27" }, "r211": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "269", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_269&doctype=Standard", "URIDate": "2025-03-27" }, "r212": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "271", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_271_c&doctype=Standard", "URIDate": "2025-03-27" }, "r213": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "271", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_271_d&doctype=Standard", "URIDate": "2025-03-27" }, "r214": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "273", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_273&doctype=Standard", "URIDate": "2025-03-27" }, "r215": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "274", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_274_e&doctype=Standard", "URIDate": "2025-03-27" }, "r216": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "28", "Subparagraph": "a", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_28_a_i&doctype=Standard", "URIDate": "2025-03-27" }, "r217": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "28", "Subparagraph": "a", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_28_a_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r218": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "31", "Subparagraph": "b", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r219": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "31", "Subparagraph": "b", "Clause": "vii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_31_b_vii&doctype=Standard", "URIDate": "2025-03-27" }, "r220": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "35", "Subparagraph": "e", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35_e_i&doctype=Standard", "URIDate": "2025-03-27" }, "r221": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "35", "Subparagraph": "e", "Clause": "iv", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35_e_iv&doctype=Standard", "URIDate": "2025-03-27" }, "r222": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "35", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35_e&doctype=Standard", "URIDate": "2025-03-27" }, "r223": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "35", "Subparagraph": "f", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35_f_i&doctype=Standard", "URIDate": "2025-03-27" }, "r224": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "35", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35&doctype=Standard", "URIDate": "2025-03-27" }, "r225": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "37", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_37&doctype=Standard", "URIDate": "2025-03-27" }, "r226": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "43", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_43&doctype=Standard", "URIDate": "2025-03-27" }, "r227": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "44", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_a&doctype=Standard", "URIDate": "2025-03-27" }, "r228": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "44", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_b&doctype=Standard", "URIDate": "2025-03-27" }, "r229": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "44", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_c&doctype=Standard", "URIDate": "2025-03-27" }, "r230": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "44", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_e&doctype=Standard", "URIDate": "2025-03-27" }, "r231": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "44", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44&doctype=Standard", "URIDate": "2025-03-27" }, "r232": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "56A", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_56A&doctype=Standard", "URIDate": "2025-03-27" }, "r233": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "62", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_62_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r234": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "62", "Subparagraph": "b", "Clause": "iii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_62_b_iii&doctype=Standard", "URIDate": "2025-03-27" }, "r235": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "64A", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_64A_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r236": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "66", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard", "URIDate": "2025-03-27" }, "r237": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "70", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard", "URIDate": "2025-03-27" }, "r238": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "71", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard", "URIDate": "2025-03-27" }, "r239": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "75", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_75_a&doctype=Standard", "URIDate": "2025-03-27" }, "r240": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "88", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_88_a&doctype=Standard", "URIDate": "2025-03-27" }, "r241": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "95", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_a&doctype=Standard", "URIDate": "2025-03-27" }, "r242": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "95", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_b&doctype=Standard", "URIDate": "2025-03-27" }, "r243": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "95", "Subparagraph": "d", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_d_i&doctype=Standard", "URIDate": "2025-03-27" }, "r244": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "95", "Subparagraph": "d", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_d_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r245": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "95", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95&doctype=Standard", "URIDate": "2025-03-27" }, "r246": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "B10", "Subparagraph": "a", "Clause": "iv", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B10_a_iv&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r247": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "B10", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B10_a&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r248": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "B10", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B10&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r249": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "B12", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B12&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r250": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "B9", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B9_f&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r251": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expired 2023-01-01", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "37", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_37_a&doctype=Standard&book=b", "URIDate": "2025-03-27" }, "r252": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expired 2023-01-01", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "37", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_37&doctype=Standard&book=b", "URIDate": "2025-03-27" }, "r253": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2026-01-01", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.49", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.49&doctype=Standard", "URIDate": "2025-03-27" }, "r254": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "104", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_104&doctype=Standard", "URIDate": "2025-03-27" }, "r255": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "106", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_a&doctype=Standard", "URIDate": "2025-03-27" }, "r256": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "106", "Subparagraph": "d", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d_i&doctype=Standard", "URIDate": "2025-03-27" }, "r257": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "106", "Subparagraph": "d", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r258": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "106", "Subparagraph": "d", "Clause": "iii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d_iii&doctype=Standard", "URIDate": "2025-03-27" }, "r259": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "106", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d&doctype=Standard", "URIDate": "2025-03-27" }, "r260": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "106", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106&doctype=Standard", "URIDate": "2025-03-27" }, "r261": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "107", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_107&doctype=Standard", "URIDate": "2025-03-27" }, "r262": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "35", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_35&doctype=Standard", "URIDate": "2025-03-27" }, "r263": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "54", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_a&doctype=Standard", "URIDate": "2025-03-27" }, "r264": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "54", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_c&doctype=Standard", "URIDate": "2025-03-27" }, "r265": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "54", "Subparagraph": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_i&doctype=Standard", "URIDate": "2025-03-27" }, "r266": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "54", "Subparagraph": "n", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_n&doctype=Standard", "URIDate": "2025-03-27" }, "r267": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "54", "Subparagraph": "o", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_o&doctype=Standard", "URIDate": "2025-03-27" }, "r268": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "54", "Subparagraph": "q", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_q&doctype=Standard", "URIDate": "2025-03-27" }, "r269": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "54", "Subparagraph": "r", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_54_r&doctype=Standard", "URIDate": "2025-03-27" }, "r270": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "55", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard", "URIDate": "2025-03-27" }, "r271": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "56", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_56&doctype=Standard", "URIDate": "2025-03-27" }, "r272": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "61", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_61_a&doctype=Standard", "URIDate": "2025-03-27" }, "r273": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "61", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_61_b&doctype=Standard", "URIDate": "2025-03-27" }, "r274": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "61", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_61&doctype=Standard", "URIDate": "2025-03-27" }, "r275": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "7", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_7&doctype=Standard", "URIDate": "2025-03-27" }, "r276": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "78", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78_e&doctype=Standard", "URIDate": "2025-03-27" }, "r277": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "79", "Subparagraph": "a", "Clause": "iv", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_79_a_iv&doctype=Standard", "URIDate": "2025-03-27" }, "r278": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "79", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_79_a&doctype=Standard", "URIDate": "2025-03-27" }, "r279": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "79", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_79&doctype=Standard", "URIDate": "2025-03-27" }, "r280": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "81A", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81A_a&doctype=Standard", "URIDate": "2025-03-27" }, "r281": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "81A", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81A_b&doctype=Standard", "URIDate": "2025-03-27" }, "r282": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "81A", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81A_c&doctype=Standard", "URIDate": "2025-03-27" }, "r283": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "81B", "Subparagraph": "a", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81B_a_i&doctype=Standard", "URIDate": "2025-03-27" }, "r284": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "81B", "Subparagraph": "a", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81B_a_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r285": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "81B", "Subparagraph": "b", "Clause": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81B_b_i&doctype=Standard", "URIDate": "2025-03-27" }, "r286": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "81B", "Subparagraph": "b", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_81B_b_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r287": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "82", "Subparagraph": "a", "Clause": "ii", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_82_a_ii&doctype=Standard", "URIDate": "2025-03-27" }, "r288": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "82", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_82_a&doctype=Standard", "URIDate": "2025-03-27" }, "r289": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "82", "Subparagraph": "ab", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_82_ab&doctype=Standard", "URIDate": "2025-03-27" }, "r290": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "82", "Subparagraph": "ac", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_82_ac&doctype=Standard", "URIDate": "2025-03-27" }, "r291": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "82", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_82_c&doctype=Standard", "URIDate": "2025-03-27" }, "r292": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "82", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_82_d&doctype=Standard", "URIDate": "2025-03-27" }, "r293": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "90", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_90&doctype=Standard", "URIDate": "2025-03-27" }, "r294": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "91", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_91_a&doctype=Standard", "URIDate": "2025-03-27" }, "r295": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "92", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_92&doctype=Standard", "URIDate": "2025-03-27" }, "r296": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "99", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_99&doctype=Standard", "URIDate": "2025-03-27" }, "r297": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "10", "IssueDate": "2025-01-01", "Paragraph": "22", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=10&code=ifrs-tx-2025-en-r&anchor=para_22_c&doctype=Standard", "URIDate": "2025-03-27" }, "r298": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "138", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_138_a&doctype=Standard", "URIDate": "2025-03-27" }, "r299": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "138", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_138_b&doctype=Standard", "URIDate": "2025-03-27" }, "r300": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "138", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_138_d&doctype=Standard", "URIDate": "2025-03-27" }, "r301": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "147", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_147_c&doctype=Standard", "URIDate": "2025-03-27" }, "r302": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "14", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_14_f&doctype=Standard", "URIDate": "2025-03-27" }, "r303": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "17", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_17_b&doctype=Standard", "URIDate": "2025-03-27" }, "r304": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "17", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_17_e&doctype=Standard", "URIDate": "2025-03-27" }, "r305": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Section": "B Statement of cash flows for a financial institution", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_B_TI", "URIDate": "2025-03-27" }, "r306": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "12", "IssueDate": "2025-01-01", "Paragraph": "B10", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r307": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "94", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_94&doctype=Standard", "URIDate": "2025-03-27" }, "r308": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "B6", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_B6&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r309": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "IE60", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_IE60&doctype=Illustrative%20Examples", "URIDate": "2025-03-27" }, "r310": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "13", "IssueDate": "2025-01-01", "Paragraph": "IE63", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_IE63&doctype=Illustrative%20Examples", "URIDate": "2025-03-27" }, "r311": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "15", "IssueDate": "2025-01-01", "Paragraph": "B89", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2025-en-r&anchor=para_B89_a&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r312": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "15", "IssueDate": "2025-01-01", "Paragraph": "B89", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2025-en-r&anchor=para_B89_b&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r313": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "16", "IssueDate": "2025-01-01", "Paragraph": "53", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_53&doctype=Standard", "URIDate": "2025-03-27" }, "r314": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "113", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_113_b&doctype=Standard", "URIDate": "2025-03-27" }, "r315": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "96", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_96_b&doctype=Standard", "URIDate": "2025-03-27" }, "r316": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "96", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_96_c&doctype=Standard", "URIDate": "2025-03-27" }, "r317": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B64", "Subparagraph": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r318": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B64", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r319": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "IE72", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_IE72&doctype=Illustrative%20Examples", "URIDate": "2025-03-27" }, "r320": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35H", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35H&doctype=Standard", "URIDate": "2025-03-27" }, "r321": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35I", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35I_c&doctype=Standard", "URIDate": "2025-03-27" }, "r322": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35M", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35M&doctype=Standard", "URIDate": "2025-03-27" }, "r323": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "35N", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35N&doctype=Standard", "URIDate": "2025-03-27" }, "r324": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "6", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_6&doctype=Standard", "URIDate": "2025-03-27" }, "r325": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B11", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B11_b&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r326": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B11", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B11&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r327": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B35", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B35_b&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r328": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B35", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B35_c&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r329": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B35", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B35_d&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r330": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "B35", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_B35&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r331": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "IG20B", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_IG20B&doctype=Implementation%20Guidance", "URIDate": "2025-03-27" }, "r332": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "IG20C", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_IG20C&doctype=Implementation%20Guidance", "URIDate": "2025-03-27" }, "r333": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "IG20D", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance", "URIDate": "2025-03-27" }, "r334": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "IG31A", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_IG31A&doctype=Implementation%20Guidance", "URIDate": "2025-03-27" }, "r335": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "IG40B", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_IG40B&doctype=Implementation%20Guidance", "URIDate": "2025-03-27" }, "r336": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "23", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_23&doctype=Standard", "URIDate": "2025-03-27" }, "r337": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Name": "IFRS", "Number": "8", "IssueDate": "2025-01-01", "Paragraph": "28", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2025-en-r&anchor=para_28_b&doctype=Standard", "URIDate": "2025-03-27" }, "r338": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "103", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_103_a&doctype=Standard", "URIDate": "2025-03-27" }, "r339": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "103", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_103_b&doctype=Standard", "URIDate": "2025-03-27" }, "r340": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "115", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_115&doctype=Standard", "URIDate": "2025-03-27" }, "r341": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "191", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_191_c&doctype=Standard", "URIDate": "2025-03-27" }, "r342": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "35", "Subparagraph": "g", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35_g&doctype=Standard", "URIDate": "2025-03-27" }, "r343": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "35", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35&doctype=Standard", "URIDate": "2025-03-27" }, "r344": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "66", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard", "URIDate": "2025-03-27" }, "r345": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "70", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70_c&doctype=Standard", "URIDate": "2025-03-27" }, "r346": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "71", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard", "URIDate": "2025-03-27" }, "r347": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Effective 2027-01-01", "Name": "IFRS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "B9", "Subparagraph": "f", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B9_f&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r348": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "102", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_102&doctype=Standard", "URIDate": "2025-03-27" }, "r349": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "103", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_103&doctype=Standard", "URIDate": "2025-03-27" }, "r350": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "108", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_108&doctype=Standard", "URIDate": "2025-03-27" }, "r351": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "78", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_78_e&doctype=Standard", "URIDate": "2025-03-27" }, "r352": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "82A", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_82A&doctype=Standard", "URIDate": "2025-03-27" }, "r353": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "IG6", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_IG6&doctype=Implementation%20Guidance", "URIDate": "2025-03-27" }, "r354": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Exchange Act", "Number": "240", "Section": "12", "Subsection": "b-2" }, "r355": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "135", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_135_b&doctype=Standard", "URIDate": "2025-03-27" }, "r356": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IAS", "Number": "19", "IssueDate": "2025-01-01", "Paragraph": "138", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_138_b&doctype=Standard", "URIDate": "2025-03-27" }, "r357": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IAS", "Number": "33", "IssueDate": "2025-01-01", "Paragraph": "70", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=33&code=ifrs-tx-2025-en-r&anchor=para_70_b&doctype=Standard", "URIDate": "2025-03-27" }, "r358": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IAS", "Number": "38", "IssueDate": "2025-01-01", "Paragraph": "118", "Subparagraph": "e", "Clause": "iv", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2025-en-r&anchor=para_118_e_iv&doctype=Standard", "URIDate": "2025-03-27" }, "r359": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "16", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_16&doctype=Standard", "URIDate": "2025-03-27" }, "r360": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "17", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_17&doctype=Standard", "URIDate": "2025-03-27" }, "r361": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "20", "Subparagraph": "b", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_20_b&doctype=Standard", "URIDate": "2025-03-27" }, "r362": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IAS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "20", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_20&doctype=Standard", "URIDate": "2025-03-27" }, "r363": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "17", "IssueDate": "2025-01-01", "Paragraph": "C28D", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2025-en-r&anchor=para_C28D&doctype=Appendix&subtype=C", "URIDate": "2025-03-27" }, "r364": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "3", "IssueDate": "2025-01-01", "Paragraph": "B64", "Subparagraph": "i", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B", "URIDate": "2025-03-27" }, "r365": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "7", "IssueDate": "2025-01-01", "Paragraph": "7", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard", "URIDate": "2025-03-27" }, "r366": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.12", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.12&doctype=Standard", "URIDate": "2025-03-27" }, "r367": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.13", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.13&doctype=Standard", "URIDate": "2025-03-27" }, "r368": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.15", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.15&doctype=Standard", "URIDate": "2025-03-27" }, "r369": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.33", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.33&doctype=Standard", "URIDate": "2025-03-27" }, "r370": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.40", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.40&doctype=Standard", "URIDate": "2025-03-27" }, "r371": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.46", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.46&doctype=Standard", "URIDate": "2025-03-27" }, "r372": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Name": "IFRS", "Number": "9", "IssueDate": "2025-01-01", "Paragraph": "7.2.7", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2025-en-r&anchor=para_7.2.7&doctype=Standard", "URIDate": "2025-03-27" }, "r373": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "10", "Subparagraph": "e", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_10_e&doctype=Standard", "URIDate": "2025-03-27" }, "r374": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "106", "Subparagraph": "d", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d&doctype=Standard", "URIDate": "2025-03-27" }, "r375": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "108", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_108&doctype=Standard", "URIDate": "2025-03-27" }, "r376": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "112", "Subparagraph": "c", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard", "URIDate": "2025-03-27" }, "r377": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "55", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard", "URIDate": "2025-03-27" }, "r378": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "79", "Subparagraph": "a", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_79_a&doctype=Standard", "URIDate": "2025-03-27" }, "r379": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Note": "Expiry date 2027-01-01", "Name": "IAS", "Number": "1", "IssueDate": "2025-01-01", "Paragraph": "85", "URI": "https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_85&doctype=Standard", "URIDate": "2025-03-27" } } }