Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) atms	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) atms	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Banco Bradesco SA [Member]
Related Party Transaction [Line Items]
Target Number Of Atms To Be Purchased Under Master Purchase Agreement | atms	30,000		30,000
Number Of Years For Atm Master Purchase Agreement	5 years
Revenue from Related Parties	$ 20	$ 22	$ 42	$ 54
Banco Bradesco SA [Member]
Related Party Transaction [Line Items]
Due from Related Parties	$ 22		$ 22		$ 15