Document and Entity Information - USD ($) shares in Millions, $ in Billions	12 Months Ended
	Dec. 31, 2015	Feb. 17, 2016	Jun. 30, 2015
Document and Entity Information
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2015
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Registrant Name	NCR CORP
Entity Central Index Key	0000070866
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		133.1
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Public Float			$ 5.1