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Equity And Earnings Per Share (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended 36 Months Ended 60 Months Ended 144 Months Ended 200 Months Ended
Jul. 27, 2023
Jul. 26, 2023
Jan. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2010
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
May 03, 2007
Equity And Earnings Per Share [Line Items]                      
IBG Holdings Redemption of IBG LLC                     10.00%
IBG Holdings LLC Ownership Percentage of Class B Common Stock                     100.00%
Preferred stock shares authorized       10,000 10,000     10,000 10,000 10,000  
Preferred stock shares issued       0 0     0 0 0  
Preferred stock shares outstanding       0 0     0 0 0  
Amortization period DTA (years)       15 years              
Unamortized deferred tax asset arising from equity offerings       $ 197 $ 193     $ 197 $ 193 $ 197  
Percent of tax savings owed to IBG Holdings LLC       85.00%              
Percentage of tax savings retained by IBG Inc.       15.00%              
Deferred tax asset from common stock offerings       $ 682       $ 682   682  
Tax savings owed to IBG Holdings LLC                   580  
Tax savings retained by IBG Inc.                   102  
Tax savings paid to IBG Holdings LLC                   $ 268  
Shares reserved for future issuance                     360,000,000
Shares redeemed by IBG Holdings from IBG LLC             5,013,259        
Cash Redemptions IBG Holdings             $ 114        
Fair Value of Issued Shares in Exchange for Membership Interests $ 229               $ 1,700    
Stock registered, number of common stock   630,000                  
Shares Issued 2,632,748             420,000 37,478,697    
Thomas Peterffy and Affiliates Ownership       91.30%       91.30%   91.30% 84.60%
Distribution from IBG LLC       $ 741 533 $ 489          
Cash distribution to IBG, Inc.       $ 185 $ 128 $ 112          
Dividend per share       $ 0.10 $ 0.10 $ 0.10          
Dividends paid to common shareholders       $ 42 $ 40 $ 38          
Declaration Date       Jan. 16, 2024              
Payment Date       Mar. 14, 2024              
Record Date       Mar. 01, 2024              
Subsequent Event [Member]                      
Equity And Earnings Per Share [Line Items]                      
Shares Issued     50,000                
IBG LLC [Member]                      
Equity And Earnings Per Share [Line Items]                      
IBG Inc. ownership % of IBG LLC       25.40%       25.40%   25.40% 10.00%
IBG Holdings ownership % of IBG LLC       74.60%       74.60%   74.60% 90.00%
Common Class A [Member]                      
Equity And Earnings Per Share [Line Items]                      
Common stock, par value       $ 0.01 $ 0.01     $ 0.01 $ 0.01 $ 0.01  
Shares authorized       1,000,000,000 1,000,000,000     1,000,000,000 1,000,000,000 1,000,000,000  
Common stock, shares issued       107,178,928 103,057,148     107,178,928 103,057,148 107,178,928  
Common stock, shares outstanding       107,045,894 102,887,728     107,045,894 102,887,728 107,045,894  
Common Class B [Member]                      
Equity And Earnings Per Share [Line Items]                      
Common stock, par value       $ 0.01 $ 0.01     $ 0.01 $ 0.01 $ 0.01  
Shares authorized       100 100     100 100 100  
Common stock, shares issued       100 100     100 100 100  
Common stock, shares outstanding       100 100     100 100 100