3.6.0.2 html 190 380 1 true 48 0 false 6 false false R1.htm 00090 - Document - Documentation and Entity Information Sheet http://www.interactivebrokers.com/role/DocumentDocumentationAndEntityInformation Documentation and Entity Information Cover 1 false false R2.htm 00100 - Statement - Consolidated Statements of Financial Condition Sheet http://www.interactivebrokers.com/role/StatementConsolidatedStatementsOfFinancialCondition Consolidated Statements of Financial Condition Statements 2 false false R3.htm 00105 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Sheet http://www.interactivebrokers.com/role/StatementConsolidatedStatementsOfFinancialConditionParenthetical Consolidated Statements of Financial Condition (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.interactivebrokers.com/role/StatementConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 4 false false R5.htm 00300 - Statement - Consolidated Statements of Cash Flows Sheet http://www.interactivebrokers.com/role/StatementConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows Statements 5 false false R6.htm 00400 - Statement - Consolidated Statements of Changes in Equity Sheet http://www.interactivebrokers.com/role/StatementConsolidatedStatementsOfChangesInEquity Consolidated Statements of Changes in Equity Statements 6 false false R7.htm 10101 - Disclosure - Organization And Nature Of Business Sheet http://www.interactivebrokers.com/role/DisclosureOrganizationAndNatureOfBusiness Organization And Nature Of Business Notes 7 false false R8.htm 10201 - Disclosure - Significant Accounting Policies Sheet http://www.interactivebrokers.com/role/DisclosureSignificantAccountingPolicies Significant Accounting Policies Notes 8 false false R9.htm 10301 - Disclosure - Trading Activities And Related Risks Sheet http://www.interactivebrokers.com/role/DisclosureTradingActivitiesAndRelatedRisks Trading Activities And Related Risks Notes 9 false false R10.htm 10401 - Disclosure - Equity And Earnings Per Share Sheet http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShare Equity And Earnings Per Share Notes 10 false false R11.htm 10501 - Disclosure - Comprehensive Income Sheet http://www.interactivebrokers.com/role/DisclosureComprehensiveIncome Comprehensive Income Notes 11 false false R12.htm 10601 - Disclosure - Financial Assets And Financial Liabilities Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilities Financial Assets And Financial Liabilities Notes 12 false false R13.htm 10701 - Disclosure - Collateralized Transactions Sheet http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactions Collateralized Transactions Notes 13 false false R14.htm 10801 - Disclosure - Short-Term Borrowings Sheet http://www.interactivebrokers.com/role/DisclosureShortTermBorrowings Short-Term Borrowings Notes 14 false false R15.htm 10901 - Disclosure - Other Income Sheet http://www.interactivebrokers.com/role/DisclosureOtherIncome Other Income Notes 15 false false R16.htm 11001 - Disclosure - Employee Incentive Plans Sheet http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlans Employee Incentive Plans Notes 16 false false R17.htm 11101 - Disclosure - Income Taxes Sheet http://www.interactivebrokers.com/role/DisclosureIncomeTaxes Income Taxes Notes 17 false false R18.htm 11201 - Disclosure - Property, Equipment and Intangible Assets Sheet http://www.interactivebrokers.com/role/DisclosurePropertyEquipmentAndIntangibleAssets Property, Equipment and Intangible Assets Notes 18 false false R19.htm 11301 - Disclosure - Commitments, Contingencies And Guarantees Sheet http://www.interactivebrokers.com/role/DisclosureCommitmentsContingenciesAndGuarantees Commitments, Contingencies And Guarantees Notes 19 false false R20.htm 11401 - Disclosure - Segment And Geographic Information Sheet http://www.interactivebrokers.com/role/DisclosureSegmentAndGeographicInformation Segment And Geographic Information Notes 20 false false R21.htm 11501 - Disclosure - Regulatory Requirements Sheet http://www.interactivebrokers.com/role/DisclosureRegulatoryRequirements Regulatory Requirements Notes 21 false false R22.htm 11601 - Disclosure - Related Party Transactions Sheet http://www.interactivebrokers.com/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 22 false false R23.htm 11701 - Disclosure - Subsequent Events Sheet http://www.interactivebrokers.com/role/DisclosureSubsequentEvents Subsequent Events Notes 23 false false R24.htm 12001 - Disclosure - Schedule I???Condensed Financial Information of Registrant (Parent Company Only) Sheet http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnly Schedule I???Condensed Financial Information of Registrant (Parent Company Only) Notes 24 false false R25.htm 20202 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.interactivebrokers.com/role/DisclosureSignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://www.interactivebrokers.com/role/DisclosureSignificantAccountingPolicies 25 false false R26.htm 30403 - Disclosure - Equity And Earnings Per Share (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShareTables Equity And Earnings Per Share (Tables) Tables http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShare 26 false false R27.htm 30503 - Disclosure - Comprehensive Income (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureComprehensiveIncomeTables Comprehensive Income (Tables) Tables http://www.interactivebrokers.com/role/DisclosureComprehensiveIncome 27 false false R28.htm 30603 - Disclosure - Financial Assets And Financial Liabilities (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTables Financial Assets And Financial Liabilities (Tables) Tables http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilities 28 false false R29.htm 30703 - Disclosure - Collateralized Transactions (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactionsTables Collateralized Transactions (Tables) Tables http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactions 29 false false R30.htm 30801 - Disclosure - Short-Term Borrowings (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureShortTermBorrowingsTables Short-Term Borrowings (Tables) Tables http://www.interactivebrokers.com/role/DisclosureShortTermBorrowings 30 false false R31.htm 30901 - Disclosure - Other Income (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureOtherIncomeTables Other Income (Tables) Tables http://www.interactivebrokers.com/role/DisclosureOtherIncome 31 false false R32.htm 31001 - Disclosure - Employee Incentive Plans (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlansTables Employee Incentive Plans (Tables) Tables http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlans 32 false false R33.htm 31101 - Disclosure - Income Taxes (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.interactivebrokers.com/role/DisclosureIncomeTaxes 33 false false R34.htm 31201 - Disclosure - Property, Equipment and Intangible Assets(Tables) Sheet http://www.interactivebrokers.com/role/DisclosurePropertyEquipmentAndIntangibleAssetsTables Property, Equipment and Intangible Assets(Tables) Tables http://www.interactivebrokers.com/role/DisclosurePropertyEquipmentAndIntangibleAssets 34 false false R35.htm 31301 - Disclosure - Commitments, Contingencies And Guarantees (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureCommitmentsContingenciesAndGuaranteesTables Commitments, Contingencies And Guarantees (Tables) Tables http://www.interactivebrokers.com/role/DisclosureCommitmentsContingenciesAndGuarantees 35 false false R36.htm 31401 - Disclosure - Segment And Geographic Information (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureSegmentAndGeographicInformationTables Segment And Geographic Information (Tables) Tables http://www.interactivebrokers.com/role/DisclosureSegmentAndGeographicInformation 36 false false R37.htm 31501 - Disclosure - Regulatory Requirements (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureRegulatoryRequirementsTables Regulatory Requirements (Tables) Tables http://www.interactivebrokers.com/role/DisclosureRegulatoryRequirements 37 false false R38.htm 32003 - Disclosure - Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Tables) Sheet http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyTables Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Tables) Tables http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnly 38 false false R39.htm 40101 - Disclosure - Organization and Nature of Business (Details) Sheet http://www.interactivebrokers.com/role/DisclosureOrganizationAndNatureOfBusinessDetails Organization and Nature of Business (Details) Details 39 false false R40.htm 40201 - Disclosure - Significant Accounting Policies (Details) Sheet http://www.interactivebrokers.com/role/DisclosureSignificantAccountingPoliciesDetails Significant Accounting Policies (Details) Details http://www.interactivebrokers.com/role/DisclosureSignificantAccountingPoliciesPolicies 40 false false R41.htm 40401 - Disclosure - Equity And Earnings Per Share (Narrative) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShareNarrativeDetails Equity And Earnings Per Share (Narrative) (Details) Details http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShareTables 41 false false R42.htm 40403 - Disclosure - Equity And Earnings Per Share (Basic Table) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShareBasicTableDetails Equity And Earnings Per Share (Basic Table) (Details) Details http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShareTables 42 false false R43.htm 40404 - Disclosure - Equity And Earnings Per Share (Diluted Table) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShareDilutedTableDetails Equity And Earnings Per Share (Diluted Table) (Details) Details http://www.interactivebrokers.com/role/DisclosureEquityAndEarningsPerShareTables 43 false false R44.htm 40405 - Disclosure - IBG LLC Ownership of Member Interests (Table) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureIbgLlcOwnershipOfMemberInterestsTableDetails IBG LLC Ownership of Member Interests (Table) (Details) Details 44 false false R45.htm 40501 - Disclosure - Comprehensive Income (Details) Sheet http://www.interactivebrokers.com/role/DisclosureComprehensiveIncomeDetails Comprehensive Income (Details) Details http://www.interactivebrokers.com/role/DisclosureComprehensiveIncomeTables 45 false false R46.htm 40601 - Disclosure - Financial Assets And Financial Liabilities (Narrative) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesNarrativeDetails Financial Assets And Financial Liabilities (Narrative) (Details) Details http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTables 46 false false R47.htm 40602 - Disclosure - Financial Assets And Financial Liabilities (Fair Value Table) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesFairValueTableDetails Financial Assets And Financial Liabilities (Fair Value Table) (Details) Details http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTables 47 false false R48.htm 40605 - Disclosure - Financial Assets And Financial Liabilities (Trading Gains from Market Making Transactions) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTradingGainsFromMarketMakingTransactionsDetails Financial Assets And Financial Liabilities (Trading Gains from Market Making Transactions) (Details) Details http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTables 48 false false R49.htm 40606 - Disclosure - Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesFinancialAssetsAndLiabilitiesNotMeasuredAtFairValueDetails Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details) Details http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTables 49 false false R50.htm 40607 - Disclosure - Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesNettingOfFinancialAssetsDetails Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details) Details http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTables 50 false false R51.htm 40608 - Disclosure - Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesNettingOfFinancialLiabilitiesDetails Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details) Details http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTables 51 false false R52.htm 40609 - Disclosure - Financial Assets And Financial Liabilities (Secured Financing Transactions) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesSecuredFinancingTransactionsDetails Financial Assets And Financial Liabilities (Secured Financing Transactions) (Details) Details http://www.interactivebrokers.com/role/DisclosureFinancialAssetsAndFinancialLiabilitiesTables 52 false false R53.htm 40701 - Disclosure - Collateralized Transactions (Narrative) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactionsNarrativeDetails Collateralized Transactions (Narrative) (Details) Details http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactionsTables 53 false false R54.htm 40702 - Disclosure - Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactionsAmountsRelatedToCollateralizedTransactionsDetails Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) Details http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactionsTables 54 false false R55.htm 40703 - Disclosure - Collateralized Transactions (Financial instruments owned and pledged where the counterparty has the right to repledge) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactionsFinancialInstrumentsOwnedAndPledgedWhereCounterpartyHasRightToRepledgeDetails Collateralized Transactions (Financial instruments owned and pledged where the counterparty has the right to repledge) (Details) Details http://www.interactivebrokers.com/role/DisclosureCollateralizedTransactionsTables 55 false false R56.htm 40801 - Disclosure - Short-Term Borrowings (Narrative) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureShortTermBorrowingsNarrativeDetails Short-Term Borrowings (Narrative) (Details) Details http://www.interactivebrokers.com/role/DisclosureShortTermBorrowingsTables 56 false false R57.htm 40802 - Disclosure - Short-Term Borrowings (Schedule Of Short-term Borrowings) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureShortTermBorrowingsScheduleOfShortTermBorrowingsDetails Short-Term Borrowings (Schedule Of Short-term Borrowings) (Details) Details http://www.interactivebrokers.com/role/DisclosureShortTermBorrowingsTables 57 false false R58.htm 40901 - Disclosure - Other Income (Schedule Of Components Of Other Income) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureOtherIncomeScheduleOfComponentsOfOtherIncomeDetails Other Income (Schedule Of Components Of Other Income) (Details) Details http://www.interactivebrokers.com/role/DisclosureOtherIncomeTables 58 false false R59.htm 41001 - Disclosure - Employee Incentive Plans (Narrative) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlansNarrativeDetails Employee Incentive Plans (Narrative) (Details) Details http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlansTables 59 false false R60.htm 41002 - Disclosure - Employee Incentive Plans (Share Grants And Fair Value) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlansShareGrantsAndFairValueDetails Employee Incentive Plans (Share Grants And Fair Value) (Details) Details http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlansTables 60 false false R61.htm 41003 - Disclosure - Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlans2007StockIncentivePlanRoiSummaryDetails Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details) Details http://www.interactivebrokers.com/role/DisclosureEmployeeIncentivePlansTables 61 false false R62.htm 41101 - Disclosure - Income Taxes (Narrative) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureIncomeTaxesNarrativeDetails Income Taxes (Narrative) (Details) Details http://www.interactivebrokers.com/role/DisclosureIncomeTaxesTables 62 false false R63.htm 41102 - Disclosure - Income Taxes (Schedule Of The Provision For Income Taxes) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureIncomeTaxesScheduleOfProvisionForIncomeTaxesDetails Income Taxes (Schedule Of The Provision For Income Taxes) (Details) Details http://www.interactivebrokers.com/role/DisclosureIncomeTaxesTables 63 false false R64.htm 41103 - Disclosure - Income Taxes (Reconciliation Of The Statutory U.S. Federal Income Tax Rate Of 35% To The Company???s Effective Tax Rate) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureIncomeTaxesReconciliationOfStatutoryUsFederalIncomeTaxRateOf35ToCompanysEffectiveTaxRateDetails Income Taxes (Reconciliation Of The Statutory U.S. Federal Income Tax Rate Of 35% To The Company???s Effective Tax Rate) (Details) Details http://www.interactivebrokers.com/role/DisclosureIncomeTaxesTables 64 false false R65.htm 41104 - Disclosure - Income Taxes (Significant Components Of The Company???s Deferred Tax Assets (Liabilities)) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureIncomeTaxesSignificantComponentsOfCompanysDeferredTaxAssetsLiabilitiesDetails Income Taxes (Significant Components Of The Company???s Deferred Tax Assets (Liabilities)) (Details) Details http://www.interactivebrokers.com/role/DisclosureIncomeTaxesTables 65 false false R66.htm 41201 - Disclosure - Property, Equipment and Intangible Assets (Narrative) (Details) Sheet http://www.interactivebrokers.com/role/DisclosurePropertyEquipmentAndIntangibleAssetsNarrativeDetails Property, Equipment and Intangible Assets (Narrative) (Details) Details http://www.interactivebrokers.com/role/DisclosurePropertyEquipmentAndIntangibleAssetsTables 66 false false R67.htm 41202 - Disclosure - Property, Equipment and Intangible Assets (Property And Equipment) (Details) Sheet http://www.interactivebrokers.com/role/DisclosurePropertyEquipmentAndIntangibleAssetsPropertyAndEquipmentDetails Property, Equipment and Intangible Assets (Property And Equipment) (Details) Details http://www.interactivebrokers.com/role/DisclosurePropertyEquipmentAndIntangibleAssetsTables 67 false false R68.htm 41301 - Disclosure - Commitments, Contingencies And Guarantees (Minimum Annual Lease Commitments) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureCommitmentsContingenciesAndGuaranteesMinimumAnnualLeaseCommitmentsDetails Commitments, Contingencies And Guarantees (Minimum Annual Lease Commitments) (Details) Details http://www.interactivebrokers.com/role/DisclosureCommitmentsContingenciesAndGuaranteesTables 68 false false R69.htm 41302 - Disclosure - Commitments, Contingencies and Guarantees (Details) Sheet http://www.interactivebrokers.com/role/DisclosureCommitmentsContingenciesAndGuaranteesDetails Commitments, Contingencies and Guarantees (Details) Details 69 false false R70.htm 41401 - Disclosure - Segment And Geographic Information (Segment Table) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureSegmentAndGeographicInformationSegmentTableDetails Segment And Geographic Information (Segment Table) (Details) Details http://www.interactivebrokers.com/role/DisclosureSegmentAndGeographicInformationTables 70 false false R71.htm 41402 - Disclosure - Segment And Geographic Information (Geographic Table) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureSegmentAndGeographicInformationGeographicTableDetails Segment And Geographic Information (Geographic Table) (Details) Details http://www.interactivebrokers.com/role/DisclosureSegmentAndGeographicInformationTables 71 false false R72.htm 41501 - Disclosure - Regulatory Requirements (Narrative) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureRegulatoryRequirementsNarrativeDetails Regulatory Requirements (Narrative) (Details) Details http://www.interactivebrokers.com/role/DisclosureRegulatoryRequirementsTables 72 false false R73.htm 41502 - Disclosure - Regulatory Requirements (Summary Of Capital, Capital Requirements And Excess Capital) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureRegulatoryRequirementsSummaryOfCapitalCapitalRequirementsAndExcessCapitalDetails Regulatory Requirements (Summary Of Capital, Capital Requirements And Excess Capital) (Details) Details http://www.interactivebrokers.com/role/DisclosureRegulatoryRequirementsTables 73 false false R74.htm 41601 - Disclosure - Related Party Transactions (Details) Sheet http://www.interactivebrokers.com/role/DisclosureRelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://www.interactivebrokers.com/role/DisclosureRelatedPartyTransactions 74 false false R75.htm 42001 - Disclosure - Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Financial Conditions) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyCondensedStatementsOfFinancialConditionsDetails Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Financial Conditions) (Details) Details http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyTables 75 false false R76.htm 42002 - Disclosure - Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Comprehensive Income) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyCondensedStatementsOfComprehensiveIncomeDetails Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Comprehensive Income) (Details) Details http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyTables 76 false false R77.htm 42003 - Disclosure - Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Cash Flows) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyCondensedStatementsOfCashFlowsDetails Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Cash Flows) (Details) Details http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyTables 77 false false R78.htm 42004 - Disclosure - Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Transactions With Affiliates) (Details) Sheet http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyTransactionsWithAffiliatesDetails Schedule I???Condensed Financial Information of Registrant (Parent Company Only) (Transactions With Affiliates) (Details) Details http://www.interactivebrokers.com/role/DisclosureScheduleIcondensedFinancialInformationOfRegistrantParentCompanyOnlyTables 78 false false All Reports Book All Reports ibkr-20161231.xml ibkr-20161231.xsd ibkr-20161231_cal.xml ibkr-20161231_def.xml ibkr-20161231_lab.xml ibkr-20161231_pre.xml true true