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Regulatory Requirements (Summary Of Capital, Capital Requirements And Excess Capital) (Details) $ in Millions	Sep. 30, 2022 USD ($)
Net Capital / Eligible Equity	$ 9,338
Requirement	1,220
Excess	8,118
IB LLC [Member]
Net Capital / Eligible Equity	6,130
Requirement	740
Excess	5,390
IBKRFS [Member]
Net Capital / Eligible Equity	517
Requirement	12
Excess	505
IBHK [Member]
Net Capital / Eligible Equity	975
Requirement	206
Excess	769
Other Regulated Operating Companies [Member]
Net Capital / Eligible Equity	1,716
Requirement	262
Excess	$ 1,454

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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