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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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