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Disclosure - Financial Assets And Financial Liabilities (Financial Assets and Liabilities Not Measured at Fair Value) (Details)link:presentationLinklink:calculationLinklink:definitionLink40607 - Disclosure - Financial Assets And Financial Liabilities (Netting of Financial Assets) (Details)link:presentationLinklink:calculationLinklink:definitionLink40608 - Disclosure - Financial Assets And Financial Liabilities (Netting of Financial Liabilities) (Details)link:presentationLinklink:calculationLinklink:definitionLink40609 - Disclosure - Financial Assets And Financial Liabilities (Secured Financing Transactions) (Details)link:presentationLinklink:calculationLinklink:definitionLink40702 - Disclosure - Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details)link:presentationLinklink:calculationLinklink:definitionLink40703 - Disclosure - Collateralized Transactions (Financial instruments owned and pledged where the counterparty has the right to repledge) (Details)link:presentationLinklink:calculationLinklink:definitionLink40904 - Disclosure - Other Income (Schedule Of Components Of Other Income) (Details)link:presentationLinklink:calculationLinklink:definitionLink41102 - Disclosure - Income Taxes (Schedule Of The Provision For Income Taxes) (Details)link:presentationLinklink:calculationLinklink:definitionLink41103 - Disclosure - Income Taxes (Reconciliation Of The Statutory U.S. Federal Income Tax Rate Of 35% To The Company’s Effective Tax Rate) (Details)link:presentationLinklink:calculationLinklink:definitionLink41104 - Disclosure - Income Taxes (Significant Components Of The Company’s Deferred Tax Assets (Liabilities)) (Details)link:presentationLinklink:calculationLinklink:definitionLink41203 - Disclosure - Leases (Lease Cost) (Details)link:presentationLinklink:calculationLinklink:definitionLink41204 - Disclosure - Leases (Undiscounted Cash Flows of Operating Lease) (Details)link:presentationLinklink:calculationLinklink:definitionLink41204 - Disclosure - Leases (Undiscounted Cash Flows of Operating Lease) (Details) (Alternate)link:presentationLinklink:calculationLinklink:definitionLink41205 - Disclosure - Leases (Minimum Annual Lease Commitments) (Details)link:presentationLinklink:calculationLinklink:definitionLink41306 - Disclosure - Property, Equipment and Intangible Assets (Property And Equipment) (Details)link:presentationLinklink:calculationLinklink:definitionLink41602 - Disclosure - Regulatory Requirements (Summary Of Capital, Capital Requirements And Excess Capital) (Details)link:presentationLinklink:calculationLinklink:definitionLink41902 - Disclosure - Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Comprehensive Income) (Details)link:presentationLinklink:calculationLinklink:definitionLink00090 - Document - Documentation and Entity Informationlink:presentationLinklink:calculationLinklink:definitionLink00105 - Statement - Consolidated Statements of Financial Condition (Parenthetical)link:presentationLinklink:calculationLinklink:definitionLink00400 - Statement - Consolidated Statements of Changes in Equitylink:presentationLinklink:calculationLinklink:definitionLink10101 - 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Employee Incentive Planslink:presentationLinklink:calculationLinklink:definitionLink11101 - Disclosure - Income Taxeslink:presentationLinklink:calculationLinklink:definitionLink11201 - Disclosure - Leaseslink:presentationLinklink:calculationLinklink:definitionLink11301 - Disclosure - Property, Equipment and Intangible Assetslink:presentationLinklink:calculationLinklink:definitionLink11401 - Disclosure - Commitments, Contingencies And Guaranteeslink:presentationLinklink:calculationLinklink:definitionLink11501 - Disclosure - Segment And Geographic Informationlink:presentationLinklink:calculationLinklink:definitionLink11601 - Disclosure - Regulatory Requirementslink:presentationLinklink:calculationLinklink:definitionLink11701 - Disclosure - Related Party Transactionslink:presentationLinklink:calculationLinklink:definitionLink11801 - Disclosure - Subsequent Eventslink:presentationLinklink:calculationLinklink:definitionLink11901 - Disclosure - Schedule I - Condensed Financial Information of Registrant (Parent Company Only)link:presentationLinklink:calculationLinklink:definitionLink20202 - Disclosure - Significant Accounting Policies (Policies)link:presentationLinklink:calculationLinklink:definitionLink30203 - Disclosure - Significant Accounting Policies (Tables)link:presentationLinklink:calculationLinklink:definitionLink30403 - Disclosure - Equity And Earnings Per Share (Tables)link:presentationLinklink:calculationLinklink:definitionLink30503 - Disclosure - Comprehensive Income (Tables)link:presentationLinklink:calculationLinklink:definitionLink30603 - Disclosure - Financial Assets And Financial Liabilities (Tables)link:presentationLinklink:calculationLinklink:definitionLink30703 - Disclosure - Collateralized Transactions (Tables)link:presentationLinklink:calculationLinklink:definitionLink30803 - Disclosure - Revenue From Contracts With Customers (Tables)link:presentationLinklink:calculationLinklink:definitionLink30903 - Disclosure - Other Income (Tables)link:presentationLinklink:calculationLinklink:definitionLink31003 - Disclosure - Employee Incentive Plans (Tables)link:presentationLinklink:calculationLinklink:definitionLink31103 - Disclosure - Income Taxes (Tables)link:presentationLinklink:calculationLinklink:definitionLink31203 - Disclosure - Leases (Tables)link:presentationLinklink:calculationLinklink:definitionLink31303 - Disclosure - Property, Equipment and Intangible Assets (Tables)link:presentationLinklink:calculationLinklink:definitionLink31503 - Disclosure - Segment And Geographic Information (Tables)link:presentationLinklink:calculationLinklink:definitionLink31603 - Disclosure - Regulatory Requirements (Tables)link:presentationLinklink:calculationLinklink:definitionLink40101 - Disclosure - Organization Of Business (Details)link:presentationLinklink:calculationLinklink:definitionLink40201 - Disclosure - Significant Accounting Policies (Details)link:presentationLinklink:calculationLinklink:definitionLink40202 - Disclosure - Significant Accounting Policies (Schedule Of Securities Segregated For Regulatory Purposes) (Details)link:presentationLinklink:calculationLinklink:definitionLink40401 - Disclosure - Equity And Earnings Per Share (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40402 - Disclosure - Equity And Earnings Per Share (IBG LLC Ownership of Member Interests) (Details)link:presentationLinklink:calculationLinklink:definitionLink40403 - Disclosure - Equity And Earnings Per Share (Basic Table) (Details)link:presentationLinklink:calculationLinklink:definitionLink40501 - Disclosure - Comprehensive Income (Details)link:presentationLinklink:calculationLinklink:definitionLink40601 - Disclosure - Financial Assets And Financial Liabilities (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40701 - Disclosure - Collateralized Transactions (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40801 - Disclosure - Revenue From Contracts With Customers (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink40802 - Disclosure - Revenue From Contracts With Customers (Disaggregation of Revenue ) (Details)link:presentationLinklink:calculationLinklink:definitionLink40903 - Disclosure - Other Income (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41001 - Disclosure - Employee Incentive Plans (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41002 - Disclosure - Employee Incentive Plans (Share Grants And Fair Value) (Details)link:presentationLinklink:calculationLinklink:definitionLink41003 - Disclosure - Employee Incentive Plans (2007 Stock Incentive Plan, ROI Summary) (Details)link:presentationLinklink:calculationLinklink:definitionLink41101 - Disclosure - Income Taxes (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41201 - Disclosure - Leases (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41202 - Disclosure - Leases (Supplemental Balance Sheet Information Related To Operating Leases) (Details)link:presentationLinklink:calculationLinklink:definitionLink41301 - Disclosure - Property, Equipment and Intangible Assets (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41401 - Disclosure - Commitments, Contingencies and Guarantees (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41501 - Disclosure - Segment And Geographic Information (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41502 - Disclosure - Segment And Geographic Information (Segment Table) (Details)link:presentationLinklink:calculationLinklink:definitionLink41503 - Disclosure - Segment And Geographic Information (Geographic Table) (Details)link:presentationLinklink:calculationLinklink:definitionLink41601 - Disclosure - Regulatory Requirements (Narrative) (Details)link:presentationLinklink:calculationLinklink:definitionLink41701 - Disclosure - Related Party Transactions (Details)link:presentationLinklink:calculationLinklink:definitionLink41901 - Disclosure - Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Financial Conditions) (Details)link:presentationLinklink:calculationLinklink:definitionLink41903 - Disclosure - Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Cash Flows) (Details)link:presentationLinklink:calculationLinklink:definitionLink41904 - Disclosure - Schedule I - Condensed Financial Information of Registrant (Parent Company Only) (Transactions With Affiliates) (Details)link:presentationLinklink:calculationLinklink:definitionLink