Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($) atms	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Banco Bradesco SA [Member]
Related Party Transaction [Line Items]
Target Number Of Atms To Be Purchased Under Master Purchase Agreement | atms	30,000
Number Of Years For Atm Master Purchase Agreement	5 years
Revenue from Related Parties	$ 18	$ 18
Banco Bradesco SA [Member]
Related Party Transaction [Line Items]
Due from Related Parties	$ 13		$ 11