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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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