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Employee Benefit Plans Cash Contributions (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Postemployment Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year $ 80us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= ncr_PostemploymentBenefitPlansDefinedBenefitMember
International Pension Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year 35us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
Other Postretirement Benefit Plan, Defined Benefit [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year $ 4us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember