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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Banco Bradesco SA [Member]          
Business Combination, Description [Abstract]          
Revenue from Related Parties $ 18 $ 37 $ 25 $ 43  
Banco Bradesco SA [Member]          
Business Combination, Description [Abstract]          
Due from Related Parties $ 12   $ 12   $ 18
JetPay [Member]          
Business Combination, Description [Abstract]          
Business Acquisition, Share Price $ 5.05   $ 5.05    
Business Combination, Consideration Transferred $ 184