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Documentation and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 21, 2025
Jun. 28, 2024
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
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    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 12,885,708,490
Current Fiscal Year End Date --12-31    
Fiscal Period Focus FY    
Fiscal Year Focus 2024    
Entity Central Index Key 0001381197    
Amendment Flag true    
Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference: Portions of Registrant’s definitive proxy statement for its 2025 annual meeting of shareholders are incorporated by reference in Part III of this Form 10-K.    
Amendment Description Explanatory NoteThis Amendment No. 1 (this "Amendment") to the Annual Report on Form 10-K filed on February 27, 2025 (the “Original Annual Report”) of Interactive Brokers Group, Inc. (the “Company”) is being filed solely for the purpose of correcting the inadvertent omissions of a 10b5-1 trading plan adopted by one of the Company’s named executive officers and a modification of an existing 10b5-1 trading plan of another named executive officer, of the Company, under the caption “Item 9B. Other Information” on page 113 of the Form 10-K by amending only the data appearing in Part II, Item 9B. “Other Information” in the Original Annual Report. 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    
Common Class A [Member]      
Common Stock Shares Outstanding   108,931,614  
Common Class B [Member]      
Common Stock Shares Outstanding   100