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Segment And Geographic Information (Segment Table) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | $ 466 | $ 439 | $ 1,437 | $ 1,411 |
Income before income taxes | 281 | 276 | 845 | 887 |
Assets | 67,804 |  | 67,804 |  | $ 60,547
Electronic Brokerage [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | 506 | 444 | 1,435 | 1,352 |
Income before income taxes | 331 | 292 | 883 | 866 |
Assets | 66,082 |  | 66,082 |  | 58,631
Market Making [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | 17 | 16 | 52 | 59 |
Income before income taxes | 8 | 7 | 25 | 25 |
Assets | 2,768 |  | 2,768 |  | 2,736
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total net revenues | (57) | (21) | (50) |  |
Income before income taxes | (58) | $ (23) | (63) | $ (4) |
Assets | $ (1,046) |  | $ (1,046) |  | $ (820)

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