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Equity And Earnings Per Share (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 36 Months Ended 60 Months Ended 110 Months Ended
Jul. 26, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2010
Dec. 31, 2015
Jun. 30, 2016
May 03, 2007
Equity And Earnings Per Share [Line Items]              
IBG Inc. ownership % of IBG LLC 16.60% 16.20%       16.20% 10.00%
IBG Holdings ownership % of IBG LLC   83.80%       83.80% 90.00%
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  
Preferred stock shares issued   0     0 0  
Preferred stock shares outstanding   0     0 0  
Amortization period DTA (years)   15 years          
Unamortized deferred tax asset arising from equity offerings   $ 275     $ 288 $ 275  
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   $ 460       460  
Tax savings owed to IBG Holdings LLC   391       391  
Tax savings retained by IBG Inc.   69       69  
Tax savings paid to IBG Holdings LLC           116  
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 For Membership Exchange   $ 306       $ 306  
Shares Issued 1,596,200       11,047,295    
Thomas Peterffy and Affiliates Ownership   88.70%       88.70% 84.60%
Distribution from IBG LLC   $ 197          
Cash distribution to IBG, Inc.   $ 32          
Dividend per share   $ 0.10          
Dividends paid to common shareholders   $ 13 $ 12        
Declaration Date   Jul. 19, 2016          
Payment Date   Sep. 14, 2016          
Record Date   Sep. 01, 2016          
Common Class A              
Equity And Earnings Per Share [Line Items]              
Common stock, par value   $ 0.01     $ 0.01 $ 0.01  
Shares authorized   1,000,000,000     1,000,000,000 1,000,000,000  
Common stock, shares issued   66,516,360     64,121,150 66,516,360  
Common stock, shares outstanding   65,671,645     63,985,335 65,671,645  
Common Class B              
Equity And Earnings Per Share [Line Items]              
Shares authorized   100     100 100  
Common stock, shares issued   100     100 100  
Common stock, shares outstanding   100     100 100