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Reorganization and Business Transformation (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]          
Asset write-downs $ 0 $ 57,000,000      
Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Total reorganization and business transformation cost     $ 23,000,000 $ 26,000,000 $ 129,000,000
Employee severance and other employee related cost     0 2,000,000 14,000,000
Asset write-downs     0 0 80,000,000
Professional services, legal and other associated cost     0 24,000,000 35,000,000
Payments for restructuring     11,000,000    
Employee separation benefits costs related to headquarter transition and business transformation | Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Total reorganization and business transformation cost     14,000,000 0 0
Transition support and other exit related costs for the headquarter transition and business transformation | Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Total reorganization and business transformation cost     9,000,000 0 0
Employee Severance | Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Payments for restructuring     1,000,000 1,000,000 20,000,000
2015 Restructuring Plan          
Restructuring Cost and Reserve [Line Items]          
Total reorganization and business transformation cost       $ 26,000,000 $ 129,000,000
Minimum          
Restructuring Cost and Reserve [Line Items]          
Estimated costs to be incurred 35,000,000   35,000,000    
Minimum | 2018 Consolidation Plan | Accelerated Depreciation For Right-To-Use Assets          
Restructuring Cost and Reserve [Line Items]          
Estimated costs to be incurred 6,000,000,000,000   6,000,000,000,000    
Minimum | 2018 Consolidation Plan | Outsider Services, Legal, And Other Associated Costs          
Restructuring Cost and Reserve [Line Items]          
Estimated costs to be incurred 8,000,000,000,000   8,000,000,000,000    
Minimum | 2018 Consolidation Plan | Employee Severance          
Restructuring Cost and Reserve [Line Items]          
Estimated costs to be incurred 21,000,000,000,000   21,000,000,000,000    
Maximum          
Restructuring Cost and Reserve [Line Items]          
Estimated costs to be incurred 45,000,000   45,000,000    
Maximum | 2018 Consolidation Plan | Accelerated Depreciation For Right-To-Use Assets          
Restructuring Cost and Reserve [Line Items]          
Estimated costs to be incurred 8,000,000,000,000   8,000,000,000,000    
Maximum | 2018 Consolidation Plan | Outsider Services, Legal, And Other Associated Costs          
Restructuring Cost and Reserve [Line Items]          
Estimated costs to be incurred 11,000,000,000,000   11,000,000,000,000    
Maximum | 2018 Consolidation Plan | Employee Severance          
Restructuring Cost and Reserve [Line Items]          
Estimated costs to be incurred 26,000,000,000,000   26,000,000,000,000    
Other Current Liabilities | Marketing Applications          
Restructuring Cost and Reserve [Line Items]          
Restructuring reserve $ 12,000,000   $ 12,000,000