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Segment And Geographic Information (Segment Table) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total net revenues	$ 558	$ 527
Income before income taxes	339	340
Assets	63,526		$ 60,547
Electronic Brokerage [Member]
Segment Reporting Information [Line Items]
Total net revenues	456	465
Income before income taxes	250	291
Assets	61,764		58,631
Market Making [Member]
Segment Reporting Information [Line Items]
Total net revenues	15	21
Income before income taxes	6	9
Assets	2,469		2,736
Corporate [Member]
Segment Reporting Information [Line Items]
Total net revenues	87	41
Income before income taxes	83	$ 40
Assets	$ (707)		$ (820)

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