Document and Entity Information In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Oct. 15, 2014
Document and Entity Information
Document Type	10-Q
Document Period End Date	Sep. 30, 2014
Document Fiscal Year Focus	2014
Amendment Flag	false
Document Fiscal Period Focus	Q3
Entity Registrant Name	NCR CORP
Entity Central Index Key	0000070866
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		168.4
Current Fiscal Year End Date	--12-31