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Acquisitions and Divestiture (2018 Divestiture) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on divestiture of businesses			$ 33	$ 0	$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Public Relations Solutions and Digital Media Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on divestiture of businesses		$ 33
Gain on divestiture of business, after tax		$ 14
Working capital adjustment	$ 8
Working capital adjustment, after tax	$ 5