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Financial Assets And Financial Liabilities (Level 3 Financial Liabilities) (Details)	3 Months Ended
	Mar. 31, 2024 USD ($)
Financial Liabilities Level 3 Rollforward [Abstract]
Transfers in and/or out of Level 3 (Liabilities)	$ 0

X

- 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

X

- 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