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Regulatory Requirements (Summary Of Capital, Capital Requirements And Excess Capital) (Details) $ in Millions	Jun. 30, 2021 USD ($)
Net Capital / Eligible Equity	$ 7,951
Requirement	1,766
Excess	6,185
IB LLC [Member]
Net Capital / Eligible Equity	4,831
Requirement	912
Excess	3,919
IBKRFS [Member]
Net Capital / Eligible Equity	611
Requirement	11
Excess	600
IBHK [Member]
Net Capital / Eligible Equity	788
Requirement	330
Excess	458
Other Regulated Operating Companies [Member]
Net Capital / Eligible Equity	1,721
Requirement	513
Excess	$ 1,208

X

- Definition

Eligible equity is equal to the sum of audited capital and reserves and the eligible portion of subordinated debt. Net capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined.

+ References

No definition available.

+ Details

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X

- Definition

Minimum amount of net capital required to be maintained by broker-dealer parent, calculated under Aggregate Indebtedness Standard.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

+ Details

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X

- Definition

Amount of total risk-based capital exceeding minimum required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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