Basis of Presentation and Summary of Significant Accounting Policies Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011 atms
Related Party Transaction [Line Items]
Adjustment to Redeemable Noncontrolling Interest		$ 14
Number of Years for ATM Master Purchase Agreement			5
Banco Bradesco SA [Member]
Related Party Transaction [Line Items]
Target Number of ATMs to be Purchased under Master Purchase Agreement			30,000
Related Party Transaction, Revenues from Transactions with Related Party	28	55
Due from Related Parties	$ 9	$ 9