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Equity And Earnings Per Share (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended | 36 Months Ended | 60 Months Ended | 113 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2010 | Dec. 31, 2015 | Sep. 30, 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 |  |
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 | $ 279 |  |  | $ 288 | $ 279 |  |
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 | $ 226 |  |  |  |  |  |
Cash distribution to IBG, Inc. | $ 37 |  |  |  |  |  |
Dividend per share | $ 0.10 |  |  |  |  |  |
Dividends paid to common shareholders | $ 20 | $ 18 |  |  |  |  |
Declaration Date | Oct. 18, 2016 |  |  |  |  |  |
Payment Date | Dec. 14, 2016 |  |  |  |  |  |
Record Date | Dec. 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 | 68,117,402 |  |  | 64,121,150 | 68,117,402 |  |
Common stock, shares outstanding | 67,982,963 |  |  | 63,985,335 | 67,982,963 |  |
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 |  |

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