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Segment And Geographic Information (Segment Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total net revenues	$ 413	$ 445	$ 971	$ 972
Income before income taxes	225	271	564	611
Assets	66,034		66,034		$ 60,547
Electronic Brokerage [Member]
Segment Reporting Information [Line Items]
Total net revenues	473	443	929	908
Income before income taxes	302	283	552	574
Assets	64,217		64,217		58,631
Market Making [Member]
Segment Reporting Information [Line Items]
Total net revenues	20	22	35	43
Income before income taxes	11	9	17	18
Assets	2,656		2,656		2,736
Corporate [Member]
Segment Reporting Information [Line Items]
Total net revenues	(80)	(20)	7	21
Income before income taxes	(88)	$ (21)	(5)	$ 19
Assets	$ (839)		$ (839)		$ (820)

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