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Goodwill and Acquired Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill [Line Items]
Impairment of goodwill	$ 0	$ 340	$ 0	$ 340	$ 0
Goodwill carrying value	587			587		$ 948
Marketing Applications
Goodwill [Line Items]
Impairment of goodwill				340
Goodwill carrying value	244			244		$ 597
Americas | Marketing Applications
Goodwill [Line Items]
Impairment of goodwill				241
Goodwill carrying value	177			177
International | Marketing Applications
Goodwill [Line Items]
Impairment of goodwill				99
Goodwill carrying value	$ 67			$ 67

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://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef



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X

- Definition

Amount of loss from the write-down 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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Reference 3: http://www.xbrl.org/2003/role/presentationRef



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-Section 50



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