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Business Segments (Tables)

9 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Schedule of Operating Segments

The following table presents certain information regarding our operating segments for the three and nine months ended September 30, 2018 and 2017:

	Market Services				Corporate Services				Information Services				Market Technology				Corporate Items				Consolidated
	(in millions)
Three Months Ended September 30, 2018
Total revenues	$	586			$	131			$	179			$	68			$	—			$	964
Transaction-based expenses	(364		)		—				—				—				—				(364		)
Revenues less transaction-based expenses	222				131				179				68				—				600
Operating income (loss)	$	121			$	42			$	117			$	9			$	(43	)		$	246
Three Months Ended September 30, 2017
Total revenues	$	581			$	126			$	150			$	62			$	46			$	965
Transaction-based expenses	(362		)		—				—				—				—				(362		)
Revenues less transaction-based expenses	219				126				150				62				46				603
Operating income (loss)	$	118			$	41			$	111			$	14			$	(22	)		$	262
Nine Months Ended September 30, 2018
Total revenues	$	1,968			$	395			$	528			$	194			$	56			$	3,141
Transaction-based expenses	(1,259		)		—				—				—				—				(1,259		)
Revenues less transaction-based expenses	709				395				528				194				56				1,882
Operating income (loss)	$	402			$	122			$	342			$	20			$	(99	)		$	787
Nine Months Ended September 30, 2017
Total revenues	$	1,808			$	370			$	432			$	176			$	143			$	2,929
Transaction-based expenses	(1,149		)		—				—				—				—				(1,149		)
Revenues less transaction-based expenses	659				370				432				176				143				1,780
Operating income (loss)	$	359			$	115			$	318			$	39			$	(81	)		$	750

Schedule of Corporate Items

A summary of our corporate items is as follows:

	Three Months Ended September 30,								Nine Months Ended September 30,
	2018				2017				2018				2017
	(in millions)
Revenues - divested businesses	$	—			$	46			$	56			$	143
Expenses:
Amortization expense of acquired intangible assets	27				22				83				67
Merger and strategic initiatives expense	6				3				7				20
Clearing default loss	8				—				8				—
Extinguishment of debt	—				—				—				10
Expenses - divested businesses	—				42				51				125
Other	2				1				6				2
Total expenses	43				68				155				224
Operating loss	$	(43	)		$	(22	)		$	(99	)		$	(81	)

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Schedule of Corporate Items and Elimination [Table Text Block]

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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.

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