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v3.19.2

Segment And Geographic Information (Narrative) (Details) | 6 Months Ended
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Jun. 30, 2019 country item segment
Number of Operating Segments | segment | 2
Number of Countries in which Entity Operates | country | 30
Minimum [Member] |
Number Of Electronic Exchanges Which Company Executes And Clears Trades | item | 125

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- Definition Number of electronic exchanges and market centers in which the Company executes and clears trades. + References No definition available. + Details
Name: | ibkr_NumberOfElectronicExchangesWhichCompanyExecutesAndClearsTrades
Namespace Prefix: | ibkr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |