XML 56 R41.htm IDEA: XBRL DOCUMENT v3.6.0.2
Equity And Earnings Per Share (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended 36 Months Ended 60 Months Ended 116 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2010
Dec. 31, 2015
Dec. 31, 2016
Jun. 30, 2016
May 03, 2007
Equity And Earnings Per Share [Line Items]                
IBG Inc. ownership % of IBG LLC 16.60%         16.60% 16.20% 10.00%
IBG Holdings ownership % of IBG LLC 83.40%         83.40%   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 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 $ 273 $ 288     $ 288 $ 273    
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 $ 472         472    
Tax savings owed to IBG Holdings LLC 401         401    
Tax savings retained by IBG Inc. $ 71         71    
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 89.10%         89.10%   84.60%
Distribution from IBG LLC $ 267 267 $ 324          
Cash distribution to IBG, Inc. $ 43 40 45          
Dividend per share $ 0.10              
Dividends paid to common shareholders $ 26 $ 25 $ 23          
Declaration Date Jan. 17, 2017              
Payment Date Mar. 14, 2017              
Record Date Mar. 01, 2017              
Common Class A                
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 68,119,412 64,121,150     64,121,150 68,119,412    
Common stock, shares outstanding 67,984,973 63,985,335     63,985,335 67,984,973    
Common Class B                
Equity And Earnings Per Share [Line Items]                
Shares authorized 100 100     100 100    
Common stock, shares issued 100 100     100 100    
Common stock, shares outstanding 100 100     100 100