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Segment And Geographic Information (Segment Table) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net revenues	$ 1,903	$ 1,702	$ 1,396
Income before income taxes	1,196	1,049	761
Assets	60,547	61,162	54,673
Electronic Brokerage [Member]
Segment Reporting Information [Line Items]
Total net revenues	1,842	1,405	1,239
Income before income taxes	1,177	860	756
Assets	58,631	58,787	50,072
Market Making [Member]
Segment Reporting Information [Line Items]
Total net revenues	76	86	190
Income before income taxes	34	(27)	44
Assets	2,736	8,469	11,765
Corporate [Member]
Segment Reporting Information [Line Items]
Total net revenues	(15)	211	(33)
Income before income taxes	(15)	216	(39)
Assets	$ (820)	$ (6,094)	$ (7,164)

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