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Goodwill and Acquired Intangible Assets (Schedule of Changes in Goodwill) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 6,586
Reclassification of goodwill	0
Foreign currency translation adjustment	(217)
Balance at end of period	6,369
Market Services
Goodwill [Roll Forward]
Balance at beginning of period	3,546
Reclassification of goodwill	0
Foreign currency translation adjustment	(111)
Balance at end of period	3,435
Corporate Services
Goodwill [Roll Forward]
Balance at beginning of period	490
Reclassification of goodwill	29
Foreign currency translation adjustment	(16)
Balance at end of period	503
Information Services
Goodwill [Roll Forward]
Balance at beginning of period	2,362
Reclassification of goodwill	0
Foreign currency translation adjustment	(79)
Balance at end of period	2,283
Market Technology
Goodwill [Roll Forward]
Balance at beginning of period	188
Reclassification of goodwill	(29)
Foreign currency translation adjustment	(11)
Balance at end of period	$ 148

X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Section 50
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- Definition

Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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-Topic 350
-SubTopic 20
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-Paragraph 1
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