Debt Obligations - Debt Obligations Receivables Securitization Facility (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Trade Receivables Securitization Facility, Maximum Borrowing Base	$ 200,000,000
Trade Receivables Securitization Facility, Collateral At Period End	$ 416,000,000	$ 373,000,000

Trade Receivables Securitization Facility, Collateral At Period End

No definition available.

Name:	ncr_TradeReceivablesSecuritizationFacilityCollateralAtPeriodEnd
Namespace Prefix:	ncr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant