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Segment And Geographic Information (Segment Table) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | $ 387 | $ 369 | $ 761 | $ 858 |
Income before income taxes | 204 | 213 | 417 | 550 |
Assets | 57,597 |  | 57,597 |  | $ 54,673
Electronic Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | 334 | 310 | 648 | 657 |
Income before income taxes | 198 | 191 | 383 | 426 |
Assets | 54,562 |  | 54,562 |  | 50,072
Market Making [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | 23 | 43 | 31 | 102 |
Income before income taxes | (24) | 5 | (46) | 25 |
Assets | 8,663 |  | 8,663 |  | 11,765
Corporate And Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | 30 | 16 | 82 | 99 |
Income before income taxes | 30 | $ 17 | 80 | $ 99 |
Assets | $ (5,628) |  | $ (5,628) |  | $ (7,164)

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