Goodwill and Acquired Intangible Assets (Schedule of Changes in Goodwill) (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 5,395
Goodwill acquired	837
Foreign currency translation adjustment	(205)
Balance at end of period	6,027
Market Services
Goodwill [Roll Forward]
Balance at beginning of period	2,941
Goodwill acquired	549
Foreign currency translation adjustment	(100)
Balance at end of period	3,390
Corporate Services
Goodwill [Roll Forward]
Balance at beginning of period	467
Goodwill acquired	234
Foreign currency translation adjustment	(27)
Balance at end of period	674
Information Services
Goodwill [Roll Forward]
Balance at beginning of period	1,823
Goodwill acquired	54
Foreign currency translation adjustment	(71)
Balance at end of period	1,806
Market Technology Revenues
Goodwill [Roll Forward]
Balance at beginning of period	164
Goodwill acquired	0
Foreign currency translation adjustment	(7)
Balance at end of period	$ 157

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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