XML 52 R41.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Equity And Earnings Per Share (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 36 Months Ended 63 Months Ended 156 Months Ended 203 Months Ended
Apr. 16, 2024
Jul. 26, 2023
Apr. 30, 2024
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2010
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2024
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  
Preferred stock shares issued       0     0 0 0  
Preferred stock shares outstanding       0     0 0 0  
Amortization period DTA (years)       15 years            
Unamortized deferred tax asset arising from equity offerings       $ 193     $ 193 $ 197 $ 193  
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               $ 1,900    
Stock registered, number of common stock   630,000                
Shares Issued             470,000 40,111,445    
Distribution from IBG LLC       165            
Cash distribution to IBG, Inc.       $ 42            
Dividend per share       $ 0.10 $ 0.10          
Dividends paid to common shareholders       $ 11 $ 10          
R 2024 Q2 [Member]                    
Equity And Earnings Per Share [Line Items]                    
Declaration Date       Apr. 16, 2024            
Payment Date       Jun. 14, 2024            
Record Date       May 31, 2024            
Mr. Thomas Peterffy [Member]                    
Equity And Earnings Per Share [Line Items]                    
Majority stakeholder percentage       91.30%     91.30%   91.30% 84.60%
Subsequent Event [Member]                    
Equity And Earnings Per Share [Line Items]                    
Shares Issued     50,000              
Dividend per share $ 0.25                  
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%  
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  
Shares authorized       1,000,000,000     1,000,000,000 1,000,000,000 1,000,000,000  
Common stock, shares issued       107,228,928     107,228,928 107,178,928 107,228,928  
Common stock, shares outstanding       107,094,094     107,094,094 107,045,894 107,094,094  
Common Class B [Member]                    
Equity And Earnings Per Share [Line Items]                    
Common stock, par value       $ 0.01     $ 0.01 $ 0.01 $ 0.01  
Shares authorized       100     100 100 100  
Common stock, shares issued       100     100 100 100  
Common stock, shares outstanding       100     100 100 100