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Related Party Transactions (Narrative) (Details)
card in Millions, $ in Millions
12 Months Ended
Jul. 31, 2017
Dec. 31, 2017
USD ($)
card
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Banco Bradesco [Member]        
Related Party Transaction        
Ownership percentage in joint venture   51.00%    
Notes payout period   10 years    
Triggered payments   $ 6 $ 6  
Noncontrolling interest value   $ 102    
Number of cards processed | card   73    
Banco Bradesco [Member] | Contract-Based Intangible Assets [Member]        
Related Party Transaction        
Unamortized contract intangible asset   $ 67    
One-time Dividend Payment [Member] | Banco Bradesco [Member]        
Related Party Transaction        
One time dividend payment   23 20  
Capco Consulting Business [Member]        
Related Party Transaction        
Ownership percentage 40.00%      
Banco Bradesco [Member]        
Related Party Transaction        
Total related party revenues   329 272 $ 237
Banco Bradesco [Member] | Unfavorable Currency Impact [Member]        
Related Party Transaction        
Total related party revenues   $ 24 $ 12  
Capco Consulting Business [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]        
Related Party Transaction        
Ownership percentage by non-controlling interest 60.00%