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Assets and Liabilities Held For Sale (Details) - USD ($)	1 Months Ended
	Apr. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment charge	$ 0
Carrying Amount of Assets and Liabilities Held for Sale [Abstract]
Total assets held for sale		$ 0	$ 297,000,000
Total liabilities held for sale		$ 0	45,000,000
Public Relations Solutions and Digital Media Services | Disposal Group, Not Discontinued Operations
Carrying Amount of Assets and Liabilities Held for Sale [Abstract]
Receivables, net			27,000,000
Property and equipment, net			21,000,000
Goodwill			202,000,000
Intangible assets, net			38,000,000
Other assets			9,000,000
Total assets held for sale			297,000,000
Deferred tax liabilities			16,000,000
Other current liabilities			29,000,000
Total liabilities held for sale			$ 45,000,000

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