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Regulatory Requirements (Summary Of Capital, Capital Requirements And Excess Capital) (Details) $ in Millions	Mar. 31, 2024 USD ($)
Net Capital / Eligible Equity	$ 11,999
Requirement	1,592
Excess	10,407
IB LLC [Member]
Net Capital / Eligible Equity	7,764
Requirement	975
Excess	6,789
IBHK [Member]
Net Capital / Eligible Equity	1,261
Requirement	279
Excess	982
IBIE [Member]
Net Capital / Eligible Equity	671
Requirement	193
Excess	478
Other Regulated Operating Companies [Member]
Net Capital / Eligible Equity	2,303
Requirement	145
Excess	$ 2,158

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
-Name Rule 15c3-1
-Number 240
-Section 15c3-1
-Publisher SEC

+ Details

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- 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
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

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- Details

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- Details

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- Details

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