XML 65 R54.htm IDEA: XBRL DOCUMENT
v3.24.3

Collateralized Transactions (Amounts Related to Collateralized Transactions) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Permitted To Repledge [Member] |  |  |
Collateralized Transactions [Line Items] |  |  |
Securities lending transactions |  | $ 127,795 | $ 97,210
Agreements to resell | [1] | 32,699 | 35,198
Customer margin assets |  | 76,575 | 54,847
Total collateralized transactions |  | 237,069 | 187,255
Sold Or Repledged [Member] |  |  |
Collateralized Transactions [Line Items] |  |  |
Securities lending transactions |  | 11,151 | 8,437
Agreements to resell | [1] | 30,689 | 34,825
Customer margin assets |  | 21,263 | 17,234
Total collateralized transactions |  | $ 63,103 | $ 60,496
[1] | As of September 30, 2024, $24.4 billion or 80% (as of December 31, 2023, $29.6 billion or 85%) of securities purchased under agreements to resell were segregated to satisfy regulatory requirements and are included in “Securities – segregated for regulatory purposes” in the condensed consolidated statements of financial condition.

X
- Definition Market value of collateral received in reverse repurchase transactions + References No definition available. + Details
Name: | ibkr_AgreementsToResellCollateralizedTransactions
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Collateralized Transactions [Line Items] + References No definition available. + Details
Name: | ibkr_CollateralizedTransactionsLineItems
Namespace Prefix: | ibkr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total market value of collateralized transactions as of the balance sheet date. + References No definition available. + Details
Name: | ibkr_CollateralizedTransactionsTotal
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Market value of collateral received in securities lending transactions + References No definition available. + Details
Name: | ibkr_SecuritiesLendingCollateralizedTransactions
Namespace Prefix: | ibkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of customer securities accepted as collateral by the entity that it is permitted by contract or custom to sell or re-pledge to counterparties as collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A + Details
Name: | us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_StatementScenarioAxis=ibkr_PermittedToRepledgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=ibkr_RepledgedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |