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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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