XML 40 R29.htm IDEA: XBRL DOCUMENT
v3.20.2

Collateralized Transactions (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
Disclosure Collateralized Transactions [Abstract] |
Amounts Related To Collateralized Transactions |
|  | September 30, 2020 |  | December 31, 2019
|  | Permitted |  | Sold or |  | Permitted |  | Sold or
|  | to Repledge |  | Repledged |  | to Repledge |  | Repledged
|  | (in millions)
Securities lending transactions |  | $ | 44,808 |  | $ | 3,955 |  | $ | 31,994 |  | $ | 3,944
Securities purchased under agreements to resell transactions 1 |  |  | 25,740 |  |  | 25,375 |  |  | 17,185 |  |  | 16,627
Customer margin assets |  |  | 35,353 |  |  | 10,554 |  |  | 34,156 |  |  | 11,189
|  | $ | 105,901 |  | $ | 39,884 |  | $ | 83,335 |  | $ | 31,760
________________________ (1)As of September 30, 2020, $24.3 billion or 96% (as of December 31, 2019, $14.0 billion or 84%) of securities acquired through agreements to resell that are shown as repledged have been deposited in a separate bank account for the exclusive benefit of customers in accordance with SEC Rule 15c3-3.
Financial Instruments Owned and Pledged as Collateral (table) |
|  | September 30, |  | December 31,
|  | 2020 |  | 2019
|  | (in millions)
Stocks |  | $ | 19 |  | $ | 128
U.S. and foreign government securities |  |  | 28 |  |  | 33
|  | $ | 47 |  | $ | 161

X
- Definition Amounts Related to Collateralized Transactions [table] + References No definition available. + Details
Name: | ibkr_CollateralizedTransactionsTableTextBlock
Namespace Prefix: | ibkr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | ibkr_DisclosureCollateralizedTransactionsAbstract
Namespace Prefix: | ibkr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
Name: | us-gaap_ScheduleOfFinancialInstrumentsOwnedAndPledgedAsCollateralTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration