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Impairment and Sale of the Marketing Applications Business - Narrative (Details) - USD ($)		3 Months Ended			6 Months Ended	12 Months Ended
	Jul. 01, 2016	Dec. 31, 2018	Sep. 30, 2016	Mar. 31, 2016	Jun. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 22, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of goodwill and acquired intangibles		$ 0		$ 57,000,000
Impairment of goodwill, acquired intangibles and other assets						$ 0	$ 0	$ 80,000,000
Proceeds from sale of business						0	0	92,000,000
Income tax (benefit) expense						$ (3,000,000)	$ 125,000,000	$ 96,000,000
Marketing Applications
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax (benefit) expense			$ 22,000,000
Income tax expense, related to goodwill			$ 14,000,000
Marketing Applications | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue					$ 69,000,000
Operating loss					112,000,000
Impairment of goodwill, acquired intangibles and other assets					$ 76,000,000
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 and acquired intangibles				57,000,000
Payments to acquire intangible assets				$ 19,000,000
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									$ 90,000,000
Proceeds from sale of business	$ 92,000,000
Transaction cost	$ 5,000,000

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