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Segment And Geographic Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment And Geographic Information [Abstract]

Segment Information



		Year-Ended December 31,
		2017			2016			2015
		(in millions)
Net revenues
Electronic brokerage		$	1,405		$	1,239		$	1,097
Market making			86			190			298
Corporate			211			(33)			(206)
Total net revenues		$	1,702		$	1,396		$	1,189
Income before income taxes
Electronic brokerage		$	860		$	756		$	536
Market making			(27)			44			130
Corporate			216			(39)			(208)
Total income before income taxes		$	1,049		$	761		$	458







		December 31,
		2017			2016			2015

		(in millions)
Segment assets
Electronic brokerage		$	58,787		$	50,072		$	44,421
Market making			8,469			11,765			10,825
Corporate			(6,094)			(7,164)			(6,512)
Total assets		$	61,162		$	54,673		$	48,734



Schedule Of Total Net Revenues And Income Before Income Taxes By Geographic Area



		Year-Ended December 31,
		2017			2016			2015
		(in millions)
Net revenues
United States		$	1,393		$	1,046		$	832
International			309			350			357
Total net revenues		$	1,702		$	1,396		$	1,189
Income before income taxes
United States		$	947		$	632		$	294
International			102			129			164
Total income before income taxes		$	1,049		$	761		$	458



X

- Definition

Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph a
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Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599

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-Name Accounting Standards Codification
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Name Accounting Standards Codification
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