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Business Segments (Schedule of Operating Segments) (Details) $ in Millions | 3 Months Ended
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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

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + 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 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition 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 + Details
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- Definition 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 No definition available. + Details
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