Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2011
Subsequent Event [Line Items]
Number of Years for ATM Master Purchase Agreement	5
Acquisition [Member]
Subsequent Event [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price Per Share	$ 28
Business Acquisition Estimated Cost of Acquired Entity Purchase Price	$ 1.2
Total Amount Committed by Financial Institutions for Acquisition	1.4
Portion of Financial Institution Commitment Consisting Of Term Loan Facility	700
Portion of Financial Institution Commitment Consisting of Revolving Credit Facility	700
Sale [Member]
Subsequent Event [Line Items]
Percent of NCR Brasil Stock to be Sold	49.00%
Equity Subscription, Approximate Subscription Price	$ 50
New Contract [Member]
Subsequent Event [Line Items]
Target Number of ATMs to be Purchased under Master Purchase Agreement	30,000
Initial Number of ATMs Ordered Under Master Purchase Agreement	6,000