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Financial Assets And Financial Liabilities (Level 3 Financial Liabilities) (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($)
Financial Liabilities Level 3 Rollforward [Abstract] |
Transfers in and/or out of Level 3 (Liabilities) | $ 0

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- Definition Financial Liabilities Level 3 Rollforward [Abstract] + References No definition available. + Details
Name: | ibkr_FinancialLiabilitiesLevel3RollforwardAbstract
Namespace Prefix: | ibkr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration