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Other Income (Schedule Of Components Of Other Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Income [Abstract] |  |  |  |
Market data fees | [1] | $ 45 | $ 46 | $ 39
Risk exposure fees | [1] | 16 | 26 | 24
Payments for order flow | [1] | 21 | 21 | 15
Minimum activity fees | [1] | 27 | 23 | 20
Other brokerage related fees |  | 27 | 25 | 13
Gains (losses) on financial instruments, at fair value and other investments, net |  | 40 | 24 | 1
Gains (losses) from currency diversification strategy, net |  | (60) | (19) | 110
Other, net |  | 5 | 12 | 110
Other income |  | $ 121 | $ 158 | $ 332
[1] | See Note 8 for description of these revenues.

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- Definition Account Activity Fees + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Gains (losses) on financial instruments, at fair value and other investments, net + References No definition available. + Details
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Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gains (losses) from the Company’s currency diversification strategy, net. + References No definition available. + Details
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Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Market Data Fees + References No definition available. + Details
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- Definition Other Brokerage Related Fees + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement, including gains and losses from our currency diversification strategy, financial instruments at fair value and other investments. + References No definition available. + Details
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- Definition Payments For Order Flow + References No definition available. + Details
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Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fee income earned from a small minority of customers with positions on which market risk exceeds certain threshholds. + References No definition available. + Details
Name: | ibkr_RiskExposureFees
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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- Definition The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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