Debt Obligations Debt Obligations Receivables Securitization Facility (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Debt Disclosure Receivables Securitization Facility [Abstract]
Trade Receivables Securitization Facility, Maximum Borrowing Base	$ 200
Trade Receivables Securitization Facility, Collateral At Period End	$ 417	$ 373

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