Business Segments (Schedule of Operating Segments) (Details) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($) segment	Mar. 31, 2016 USD ($)
Segment Reporting [Abstract]
Number of business segments \| segment	4
Segment Reporting Information [Line Items]
Total revenues	$ 971	$ 905
Transaction-based expenses	(388)	(371)
Revenues less transaction-based expenses	583	534
Operating income (loss)	248	219
Corporate Items
Segment Reporting Information [Line Items]
Operating income (loss)	(29)	(35)
Market Services \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	606	572
Transaction-based expenses	(388)	(371)
Revenues less transaction-based expenses	218	201
Operating income (loss)	119	113
Corporate Services \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	160	143
Transaction-based expenses	0	0
Revenues less transaction-based expenses	160	143
Operating income (loss)	43	34
Information Services \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	138	133
Transaction-based expenses	0	0
Revenues less transaction-based expenses	138	133
Operating income (loss)	102	97
Market Technology \| Operating Segments
Segment Reporting Information [Line Items]
Total revenues	67	57
Transaction-based expenses	0	0
Revenues less transaction-based expenses	67	57
Operating income (loss)	$ 13	$ 10

The aggregate cost of goods produced and sold and services rendered during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

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The net result for the period of deducting operating expenses from operating revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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