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Goodwill and Acquired Intangible Assets (Finite and Indefinite-Lived Intangible Assets Held-For-Sale) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets reclassified as held for sale - customer relationships, Gross Amount $ 1,454 $ 1,679
Finite-lived intangible assets reclassified as held for sale - customer relationships, Accumulated Amortization (409) (506)
Finite-lived intangible assets reclassified as held for sale - customer relationships, Net Amount 1,045 1,173
Indefinite-lived intangible assets reclassified as held for sale - trade name, Gross Amount 1,255 1,295
Intangible Assets, Gross (Excluding Goodwill) 2,709 2,974
Total intangible assets held for sale, Net Amount 2,300 2,468
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets reclassified as held for sale - customer relationships, Gross Amount 1,532 1,708
Finite-lived intangible assets reclassified as held for sale - customer relationships, Accumulated Amortization (456) (526)
Finite-lived intangible assets reclassified as held for sale - customer relationships, Net Amount 1,076 1,182
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets reclassified as held for sale - trade name, Gross Amount 122 $ 129
Disposal Group, Not Discontinued Operations | Public Relations Solutions and Digital Media Services    
Finite-Lived Intangible Assets [Line Items]    
Intangible Assets, Gross (Excluding Goodwill) 26  
Total intangible assets held for sale, Net Amount 16  
Disposal Group, Not Discontinued Operations | Public Relations Solutions and Digital Media Services | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets reclassified as held for sale - customer relationships, Gross Amount 21  
Finite-lived intangible assets reclassified as held for sale - customer relationships, Accumulated Amortization (10)  
Finite-lived intangible assets reclassified as held for sale - customer relationships, Net Amount 11  
Disposal Group, Not Discontinued Operations | Public Relations Solutions and Digital Media Services | Trade name    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets reclassified as held for sale - trade name, Gross Amount 5  
Indefinite-lived intangible assets reclassified as held for sale - trade name, Net Amount $ 5