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Related Party Transactions - (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Related Party Transaction [Line Items]    
Ownership percentage of the Brazilian venture 51.00%  
Banco Bradesco    
Related Party Transaction [Line Items]    
Revenues from related parties $ 80 $ 55
Banco Bradesco | Favorable (unfavorable) currency impact    
Related Party Transaction [Line Items]    
Revenues from related parties 14  
Corporate joint venture | Contract-based intangible assets    
Related Party Transaction [Line Items]    
Finite-lived intangible assets, net 86  
Noncontrolling interest in joint venture $ 107