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Segment And Geographic Information (Segment Table) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Total net revenues | $ 1,937 | $ 1,903 | $ 1,702
Income before income taxes | 1,157 | 1,196 | 1,049
Assets | 71,676 | 60,547 | 61,162
Electronic Brokerage [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues | 1,921 | 1,842 | 1,405
Income before income taxes | 1,197 | 1,177 | 860
Assets | 69,857 | 58,631 | 58,787
Market Making [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues | 67 | 76 | 86
Income before income taxes | 30 | 34 | (27)
Assets | 2,806 | 2,736 | 8,469
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net revenues | (51) | (15) | 211
Income before income taxes | (70) | (15) | 216
Assets | $ (987) | $ (820) | $ (6,094)

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