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Segment And Geographic Information (Tables) | 6 Months Ended
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Jun. 30, 2017
Segment And Geographic Information [Abstract] |
Segment Information |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended June 30, |  | Six Months Ended June 30,
﻿ |  | 2017 |  | 2016 |  | 2017 |  | 2016
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | (in millions) |  | (in millions)
﻿Net revenues |  |  |  |  |  |  |  |  |  |  |  |
﻿Electronic brokerage |  | $ | 334 |  | $ | 310 |  | $ | 648 |  | $ | 657
﻿Market making |  |  | 23 |  |  | 43 |  |  | 31 |  |  | 102
﻿Corporate |  |  | 30 |  |  | 16 |  |  | 82 |  |  | 99
﻿Total net revenues |  | $ | 387 |  | $ | 369 |  | $ | 761 |  | $ | 858
﻿Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |
﻿Electronic brokerage |  | $ | 198 |  | $ | 191 |  | $ | 383 |  | $ | 426
﻿Market making |  |  | (24) |  |  | 5 |  |  | (46) |  |  | 25
﻿Corporate |  |  | 30 |  |  | 17 |  |  | 80 |  |  | 99
﻿Total income before income taxes |  | $ | 204 |  | $ | 213 |  | $ | 417 |  | $ | 550
﻿ ﻿
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿ |  | June 30, |  | December 31,
﻿ |  | 2017 |  | 2016
﻿ |  |  |  |  |  |
﻿ |  | (in millions)
﻿Segment assets |  |  |  |  |  |
﻿Electronic brokerage |  | $ | 54,562 |  | $ | 50,072
﻿Market making |  |  | 8,663 |  |  | 11,765
﻿Corporate |  |  | (5,628) |  |  | (7,164)
﻿Total assets |  | $ | 57,597 |  | $ | 54,673
﻿
Schedule Of Total Net Revenues And Income Before Income Taxes By Geographic Area |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended June 30, |  | Six Months Ended June 30,
﻿ |  | 2017 |  | 2016 |  | 2017 |  | 2016
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | (in millions) |  | (in millions)
﻿Net revenues |  |  |  |  |  |  |  |  |  |  |  |
﻿United States |  | $ | 316 |  | $ | 278 |  | $ | 619 |  | $ | 682
﻿International |  |  | 71 |  |  | 91 |  |  | 142 |  |  | 176
﻿Total net revenues |  | $ | 387 |  | $ | 369 |  | $ | 761 |  | $ | 858
﻿Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |
﻿United States |  | $ | 186 |  | $ | 177 |  | $ | 381 |  | $ | 485
﻿International |  |  | 18 |  |  | 36 |  |  | 36 |  |  | 65
﻿Total income before income taxes |  | $ | 204 |  | $ | 213 |  | $ | 417 |  | $ | 550
﻿

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