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Related Party Transactions - (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Cardinal Holdings        
Related Party Transaction        
Ownership percentage     38.00% 38.00%
Equity method investment     $ 137 $ 151
Banco Bradesco | Corporate joint venture        
Related Party Transaction        
Ownership percentage       51.00%
Banco Bradesco | Corporate joint venture        
Related Party Transaction        
Processing and services revenue $ 80 $ 167