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Assets and Liabilities Held For Sale (Details) - USD ($)
 1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment charge $ 0 $ 0  
Carrying Amount of Assets and Liabilities Held for Sale [Abstract]      
Deferred revenue   194,000,000 $ 161,000,000
Public Relations Solutions and Digital Media Services | Disposal Group, Not Discontinued Operations      
Carrying Amount of Assets and Liabilities Held for Sale [Abstract]      
Receivables, net   13,000,000 27,000,000
Property and equipment, net   10,000,000 21,000,000
Goodwill   47,000,000 202,000,000
Intangible assets, net   16,000,000 38,000,000
Other assets   3,000,000 9,000,000
Total assets held for sale   89,000,000 297,000,000
Deferred tax liabilities   4,000,000 16,000,000
Deferred revenue   12,000,000 2,000,000
Other current liabilities   4,000,000 27,000,000
Total liabilities held for sale   $ 20,000,000 $ 45,000,000