XML 64 R53.htm IDEA: XBRL DOCUMENT v3.7.0.1

Commitments, Contingencies and Guarantees (Details) $ in Millions	30 Months Ended
	Jun. 30, 2017 USD ($)
Commitments, Contingencies And Guarantees [Abstract]
Net Loss from Unsecured Customer Receivables	$ 117

X

- Definition

Net loss from unsecured customer receivables due to the sudden move in the value of the Swiss franc that followed an unprecedented action by the Swiss National Bank in January of 2015.

+ References

No definition available.

+ Details

Name:	ibkr_NetLossFromUnsecuredCustomerReceivables
Namespace Prefix:	ibkr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration