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Goodwill and Acquired Intangible Assets (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]
Amount of goodwill expected to be deductible for tax purposes		$ 749,000,000		$ 749,000,000
Goodwill, impairment loss				0	$ 0
Amortization expense for purchased finite-lived intangible assets		27,000,000	$ 22,000,000	83,000,000	$ 67,000,000
Foreign currency translation amortization expense		1,070,000,000		1,070,000,000		$ 1,173,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Public Relations Solutions and Digital Media Services | Trade name
Indefinite-lived Intangible Assets [Line Items]
Non-cash write-off related to indefinite-lived intangible asset	$ 2,000,000
Foreign currency translation adjustment
Indefinite-lived Intangible Assets [Line Items]
Foreign currency translation amortization expense		$ (81,000,000)		$ (81,000,000)		$ (65,000,000)

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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