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Assets and Liabilities Held for Sale - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 22, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment of goodwill, acquired intangibles and other assets   $ 340 $ 76 $ 340  
Goodwill, impairment loss   318 57 318  
Impairment of intangible assets, indefinite-lived (excluding goodwill)   $ 22 19 $ 22  
Marketing Applications | Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Revenue     69    
Operating loss     112    
Impairment of goodwill, acquired intangibles and other assets     76    
Goodwill, impairment loss     57    
Goodwill     57   $ 113
Impairment of intangible assets, indefinite-lived (excluding goodwill)     $ 19    
Affiliated Entity | Marketing Applications | Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Consideration to be received from disposal of a segment $ 90        
Proceeds from sale of business $ 92