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Segment And Geographic Information (Segment Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total net revenues	$ 445	$ 387	$ 972	$ 761
Income before income taxes	271	204	611	417
Assets	60,303		60,303		$ 61,162
Electronic Brokerage [Member]
Segment Reporting Information [Line Items]
Total net revenues	443	334	908	648
Income before income taxes	283	198	574	383
Assets	58,355		58,355		58,787
Market Making [Member]
Segment Reporting Information [Line Items]
Total net revenues	22	23	43	31
Income before income taxes	9	(24)	18	(46)
Assets	2,781		2,781		8,469
Corporate [Member]
Segment Reporting Information [Line Items]
Total net revenues	(20)	30	21	82
Income before income taxes	(21)	$ 30	19	$ 80
Assets	$ (833)		$ (833)		$ (6,094)

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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