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Reorganization and Business Transformation (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]          
Impairment of goodwill and acquired intangibles   $ 57     $ 437
Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Severance costs     $ 2 $ 14 4
Impairment of goodwill and acquired intangibles     0 80 140
Other restructuring costs     24 35 8
Restructuring Charges     $ 26 129 152
Employee Severance | Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Payments for restructuring $ 1     $ 20 $ 14