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Leases (Minimum Annual Lease Commitments) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Leases [Abstract] |
2019 | $ 18
2020 | 19
2021 | 16
2022 | 16
2023 | 15
Thereafter | 83
Total | $ 167

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- Definition Minimum Annual Lease Commitments, Due + References No definition available. + Details
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Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum Annual Lease Commitments, Due After Year Five + References No definition available. + Details
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Namespace Prefix: | ibkr_
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- Definition Minimum Annual Lease Commitments, Due Year Five + References No definition available. + Details
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Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum Annual Lease Commitments, Due Year Four + References No definition available. + Details
Name: | ibkr_MinimumAnnualLeaseCommitmentsDueYearFour
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum Annual Lease Commitments, Due Year Three + References No definition available. + Details
Name: | ibkr_MinimumAnnualLeaseCommitmentsDueYearThree
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum Annual Lease Commitments, Due Year Two + References No definition available. + Details
Name: | ibkr_MinimumAnnualLeaseCommitmentsDueYearTwo
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum Annual Lease Commitments, Remainder of Fiscal Year + References No definition available. + Details
Name: | ibkr_MinimumAnnualLeaseCommitmentsRemainderOfFiscalYear
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LesseeDisclosureAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration