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Related Party Transactions - (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Banco Bradesco        
Related Party Transaction [Line Items]        
Revenues from related parties $ 89 $ 65 $ 169 $ 120
Banco Bradesco | Favorable (unfavorable) currency impact        
Related Party Transaction [Line Items]        
Revenues from related parties 7   $ 21  
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 77   $ 77  
Noncontrolling interest in joint venture $ 108   $ 108