Documentation and Entity Information - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Feb. 23, 2026 |
Jun. 30, 2025 |
|
| Document Type | 10-K/A | ||
| Document Period End Date | Dec. 31, 2025 | ||
| Document Transition Report | false | ||
| Entity File Number | 001-33440 | ||
| Entity Registrant Name | INTERACTIVE BROKERS GROUP, INC. | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 30-0390693 | ||
| Entity Address, Address Line One | One Pickwick Plaza | ||
| Entity Address, City or Town | Greenwich | ||
| Entity Address, State or Province | CT | ||
| Entity Address, Postal Zip Code | 06830 | ||
| City Area Code | 203 | ||
| Local Phone Number | 618-5800 | ||
| Title of 12(b) Security | Common Stock, par value $.01 per share | ||
| Trading Symbol | IBKR | ||
| Security Exchange Name | NASDAQ | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Document Annual Report | true | ||
| Entity Voluntary Filers | No | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Small Business | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Document Financial Statement Error Correction [Flag] | false | ||
| Entity Emerging Growth Company | false | ||
| Entity Public Float | $ 23,755,862,670 | ||
| Entity Shell Company | false | ||
| Documents Incorporated by Reference [Text Block] | Documents Incorporated by Reference: Portions of Registrant’s definitive proxy statement for its 2026 annual meeting of shareholders are incorporated by reference in Part III of this Form 10-K. |
||
| Current Fiscal Year End Date | --12-31 | ||
| Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2025 | ||
| Entity Central Index Key | 0001381197 | ||
| Amendment Flag | true | ||
| Amendment Description | This Amendment No. 1 (this "Amendment") to the Annual Report on Form 10-K filed on February 27, 2026 (the "Original Annual Report") of Interactive Brokers Group, Inc. (the "Company") is being filed solely for the purpose of correcting a clerical error under the caption "Item 9A. Controls and Procedures" of the Original Annual Report. Under the second paragraph of the "Opinion on Internal Control over Financial Reporting" section in the Report of Independent Registered Public Accounting Firm, the opinion date of the Company's financial statements was incorrectly disclosed as February 26, 2026. The correct date is February 27, 2026. A revised Report of Independent Registered Public Accounting Firm related to Internal Controls over Financial Reporting is included in this Amendment. Except as described above, no other changes have been made to the Original Annual Report. We have not updated the disclosures contained therein to reflect any events which occurred at a date subsequent to the filing of the Original Annual Report.The Company has included as exhibits to this Amendment updated certifications from the Company's Principal Executive Officer and Principal Financial Officer pursuant to Sections 302 and 906 of the Sarbanes-Oxley Act. | ||
| Common Class A [Member] | |||
| Common Stock Shares Outstanding | 445,439,458 | ||
| Common Class B [Member] | |||
| Common Stock Shares Outstanding | 400 |