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Related Party Transactions - (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Capco Consulting Business          
Related Party Transaction [Line Items]          
Ownership percentage 40.00%        
Banco Bradesco          
Related Party Transaction [Line Items]          
Processing and services revenue   $ 81 $ 75 $ 250 $ 195
Banco Bradesco | Favorable (unfavorable) currency impact          
Related Party Transaction [Line Items]          
Processing and services revenue   2   $ 23  
Corporate joint venture          
Related Party Transaction [Line Items]          
Ownership percentage of the Brazilian venture       51.00%  
Corporate joint venture | Contract-based intangible assets          
Related Party Transaction [Line Items]          
Finite-lived intangible assets, net   75   $ 75  
Noncontrolling interest in joint venture   98   $ 98  
Corporate joint venture | Brazilian Venture          
Related Party Transaction [Line Items]          
Dividends   $ 23 $ 20    
Capco Consulting Business | Disposal group, disposed of by sale, not discontinued operations          
Related Party Transaction [Line Items]          
Ownership percentage by noncontrolling owners 60.00%