Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Sep. 30, 2011 Sale [Member]	Oct. 12, 2011 Interest Rate Swap Agreement [Member]
Equity Subscription, Approximate Subscription Price		$ 43
Percent of Ncr Brasil Voting Stock Retained		51.00%
Percent of Ncr Brasil Voting Stock Sold		49.00%
Number of Years for ATM Master Purchase Agreement	5
Interest Rate Swap Beginning Notional			560
Interest Rate Swap Ending Notional			$ 341