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Reorganization and Business Transformation (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]          
Impairment of goodwill and acquired intangibles   $ 478 $ 437    
Impairment of goodwill and acquired intangibles     478 $ 0 $ 0
Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Severance costs $ 4        
Impairment of goodwill and acquired intangibles 140 340 $ 437    
Other restructuring costs 8        
Impairment of goodwill and acquired intangibles 138        
International Marketing Application          
Restructuring Cost and Reserve [Line Items]          
Impairment of goodwill and acquired intangibles 140 $ 99      
Employee Severance | Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Payments for restructuring $ 14