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Goodwill and Acquired Intangible Assets - Goodwill by Operating Segment (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Goodwill [Roll Forward]
Goodwill Balance at December 31, 2014				$ 948
Adjustments				(3)
Currency Translation Adjustments				(18)
Impairment	$ 0	$ (340)	$ 0	(340)	$ 0
Goodwill Balance at September 30, 2015	587			587
Data and Analytics
Goodwill [Roll Forward]
Goodwill Balance at December 31, 2014				351
Adjustments				(3)
Currency Translation Adjustments				(5)
Impairment				0
Goodwill Balance at September 30, 2015	343			343
Marketing Applications
Goodwill [Roll Forward]
Goodwill Balance at December 31, 2014				597
Adjustments				0
Currency Translation Adjustments				(13)
Impairment				(340)
Goodwill Balance at September 30, 2015	$ 244			$ 244

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.

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