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Segment And Geographic Information (Segment Table) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total net revenues	$ 387	$ 369	$ 761	$ 858
Income before income taxes	204	213	417	550
Assets	57,597		57,597		$ 54,673
Electronic Brokerage [Member]
Segment Reporting Information [Line Items]
Total net revenues	334	310	648	657
Income before income taxes	198	191	383	426
Assets	54,562		54,562		50,072
Market Making [Member]
Segment Reporting Information [Line Items]
Total net revenues	23	43	31	102
Income before income taxes	(24)	5	(46)	25
Assets	8,663		8,663		11,765
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Total net revenues	30	16	82	99
Income before income taxes	30	$ 17	80	$ 99
Assets	$ (5,628)		$ (5,628)		$ (7,164)

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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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