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Description of Business and Significant Accounting Policies Redeemable Noncontrolling Interest (Details) (NCR Manaus [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
NCR Manaus [Member]
   
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners   49.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= ncr_NcrManausMember
Proceeds from sale of noncontrolling interest $ 43us-gaap_ProceedsFromMinorityShareholders
/ dei_LegalEntityAxis
= ncr_NcrManausMember
 
Redeemable Noncontrolling Interests, Defined Financial Performance Period   5 years