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Regulatory Requirements (Summary Of Capital, Capital Requirements And Excess Capital) (Details) $ in Millions	Mar. 31, 2021 USD ($)
Net Capital / Eligible Equity	$ 8,193
Requirement	1,458
Excess	6,735
IB LLC [Member]
Net Capital / Eligible Equity	5,211
Requirement	753
Excess	4,458
IBKRFS [Member]
Net Capital / Eligible Equity	600
Requirement	21
Excess	579
IBHK [Member]
Net Capital / Eligible Equity	738
Requirement	264
Excess	474
Other Regulated Operating Companies [Member]
Net Capital / Eligible Equity	1,644
Requirement	420
Excess	$ 1,224

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

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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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- Details

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- Details

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- Details

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- Details

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