Documentation and Entity Information - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Feb. 23, 2026 |
Jun. 30, 2025 |
|
| Document Type | 10-K | ||
| 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 | false | ||
| Auditor Firm ID | 34 | ||
| Auditor Location | New York, New York | ||
| Auditor Name | Deloitte & Touche LLP | ||
| Auditor Opinion | We have audited the accompanying consolidated statements of financial condition of Interactive Brokers Group, Inc. and subsidiaries (the "Company") as of December 31, 2025 and 2024, the related consolidated statements of comprehensive income, cash flows and changes in equity, for each of the three years in the period ended December 31, 2025, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America. We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control — Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 27, 2026, expressed an unqualified opinion on the Company's internal control over financial reporting. |
||
| Common Class A [Member] | |||
| Common Stock Shares Outstanding | 445,439,458 | ||
| Common Class B [Member] | |||
| Common Stock Shares Outstanding | 400 |