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Impairment and Sale of the Marketing Applications Business - Narrative (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended	12 Months Ended
	Jul. 01, 2016	Sep. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Jun. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 22, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill			$ 57						$ 437
Impairment of goodwill, acquired intangibles and other assets			(76)				$ 0	$ (80)	(478)
Proceeds from sale of business							0	92	0
Income tax expense (benefit)							$ 125	$ 96	70
Marketing Applications
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense (benefit)		$ 22
Income tax expense, related to goodwill		$ 14
Marketing Applications | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill				$ 97	$ 340
Impairment of intangible assets									41
Revenue						$ 69			153
Operating loss						112			(561)
Impairment of goodwill, acquired intangibles and other assets						$ (76)			$ (478)
Assets held for sale	$ 87
Marketing Applications | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill			57
Payments to acquire intangible assets			$ 19
Affiliated Entity | Marketing Applications | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration transferred										$ 90
Proceeds from sale of business	0
Transaction cost	$ 5

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