XML 47 R36.htm IDEA: XBRL DOCUMENT
v3.25.3

Regulatory Requirements (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2025
Regulatory Requirements [Abstract] |
Summary Of Capital, Capital Requirements And Excess Capital |
|  | Net Capital/ |  |  |  |  |  |
|  | Eligible Equity |  | Requirement |  | Excess
|  | (in millions)
IB LLC |  | $ | 10,443 |  | $ | 1,628 |  | $ | 8,815
IBHK |  |  | 1,553 |  |  | 592 |  |  | 961
IBIE |  |  | 1,696 |  |  | 382 |  |  | 1,314
Other regulated operating subsidiaries |  |  | 2,780 |  |  | 179 |  |  | 2,601
|  | $ | 16,472 |  | $ | 2,781 |  | $ | 13,691

X
- Definition Summary Of Capital, Capital Requirements And Excess Capital + References No definition available. + Details
Name: | ibkr_RegulationAndCapitalAdequacyTableTextBlock
Namespace Prefix: | ibkr_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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