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Related Party Transactions - (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Corporate joint venture          
Related Party Transaction          
Ownership percentage of the Brazilian venture       51.00%  
Noncontrolling interest in joint venture   $ 98   $ 98  
Corporate joint venture | Contract-based intangible assets          
Related Party Transaction          
Finite-lived intangible assets, net   47   47  
Capco Consulting Business          
Related Party Transaction          
Ownership percentage 40.00%        
Banco Bradesco          
Related Party Transaction          
Processing and services revenue   80 $ 89 167 $ 169
Banco Bradesco | Favorable (unfavorable) currency impact          
Related Party Transaction          
Processing and services revenue   $ (10)   $ (13)  
Capco Consulting Business | Disposal group, disposed of by sale, not discontinued operations          
Related Party Transaction          
Ownership percentage by noncontrolling owners 60.00%