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Equity And Earnings Per Share (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 36 Months Ended 45 Months Ended 132 Months Ended 185 Months Ended
Aug. 01, 2022
Jul. 27, 2020
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2010
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2022
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    
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     $ 206           $ 206     $ 206 $ 209 $ 206  
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     $ 654           $ 654     $ 654   654  
Tax savings owed to IBG Holdings LLC                           556  
Tax savings retained by IBG Inc.                           98  
Tax savings paid to IBG Holdings LLC                           $ 243  
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                         $ 1,500    
Stock registered, number of common stock   990,000                          
Shares Issued 3,271,390                     270,000 34,207,307    
Shares issued, value $ 192                            
Distribution from IBG LLC                 406            
Cash distribution to IBG, Inc.                 $ 97            
Dividend per share     $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.10            
Dividends paid to common shareholders     $ 10 $ 11 $ 9       $ 30 $ 28          
Declaration Date                 Oct. 18, 2022            
Payment Date                 Dec. 14, 2022            
Record Date                 Dec. 01, 2022            
Mr. Thomas Peterffy [Member]                              
Equity And Earnings Per Share [Line Items]                              
Majority stakeholder percentage 90.50%                            
IBG LLC [Member]                              
Equity And Earnings Per Share [Line Items]                              
IBG Inc. ownership % of IBG LLC 24.50%   24.50% 23.70%         24.50%     24.50%   24.50% 10.00%
IBG LLC [Member] | Holdings [Member]                              
Equity And Earnings Per Share [Line Items]                              
IBG Holdings ownership % of IBG LLC                             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     103,003,052           103,003,052     103,003,052 98,359,572 103,003,052  
Common stock, shares outstanding     102,865,696           102,865,696     102,865,696 98,204,658 102,865,696  
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