<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.19.3</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>512</ContextCount>
  <ElementCount>535</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>125</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>14</UnitCount>
  <MyReports>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatedStatementsOfOperationsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Operations (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1002000 - Statement - Condensed Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1003000 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003501 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatedBalanceSheetsUnauditedParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1004501 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatedStatementsOfCashFlowsUnauditedParenthetical</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>1005000 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatedStatementsOfChangesInStockholdersEquityUnaudited</Role>
      <ShortName>Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Leasing</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/Leasing</Role>
      <ShortName>Leasing</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - Business Combinations and Divestitures (Notes)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.ncr.com/role/BusinessCombinationsAndDivestituresNotes</Role>
      <ShortName>Business Combinations and Divestitures (Notes)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Segment Information and Concentrations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SegmentInformationAndConcentrations</Role>
      <ShortName>Segment Information and Concentrations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Goodwill and Long-Lived Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/GoodwillAndLongLivedAssets</Role>
      <ShortName>Goodwill and Long-Lived Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Debt Obligations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DebtObligations</Role>
      <ShortName>Debt Obligations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Stock Compensation Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/StockCompensationPlans</Role>
      <ShortName>Stock Compensation Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - Employee Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EmployeeBenefitPlans</Role>
      <ShortName>Employee Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Series A Convertible Preferred Stock</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SeriesConvertiblePreferredStock</Role>
      <ShortName>Series A Convertible Preferred Stock</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Derivatives and Hedging Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DerivativesAndHedgingInstruments</Role>
      <ShortName>Derivatives and Hedging Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Fair Value of Assets and Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/FairValueOfAssetsAndLiabilities</Role>
      <ShortName>Fair Value of Assets and Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - Accumulated Other Comprehensive Income (Loss) (AOCI)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/AccumulatedOtherComprehensiveIncomeLossAoci</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (AOCI)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2116100 - Disclosure - Restructuring Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/RestructuringPlan</Role>
      <ShortName>Restructuring Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2117100 - Disclosure - Supplemental Financial Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SupplementalFinancialInformation</Role>
      <ShortName>Supplemental Financial Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2118100 - Disclosure - Condensed Consolidating Supplemental Guarantor Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatingSupplementalGuarantorInformation</Role>
      <ShortName>Condensed Consolidating Supplemental Guarantor Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2201201 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2301302 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2302301 - Disclosure - Leasing (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/LeasingTables</Role>
      <ShortName>Leasing (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/Leasing</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - Segment Information and Concentrations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SegmentInformationAndConcentrationsTables</Role>
      <ShortName>Segment Information and Concentrations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/SegmentInformationAndConcentrations</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Goodwill and Long-Lived Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/GoodwillAndLongLivedAssetsTables</Role>
      <ShortName>Goodwill and Long-Lived Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/GoodwillAndLongLivedAssets</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Debt Obligations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DebtObligationsTables</Role>
      <ShortName>Debt Obligations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/DebtObligations</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Stock Compensation Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/StockCompensationPlansTables</Role>
      <ShortName>Stock Compensation Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/StockCompensationPlans</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2309301 - Disclosure - Employee Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EmployeeBenefitPlansTables</Role>
      <ShortName>Employee Benefit Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/EmployeeBenefitPlans</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/CommitmentsAndContingencies</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/EarningsPerShare</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2313301 - Disclosure - Derivatives and Hedging Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DerivativesAndHedgingInstrumentsTables</Role>
      <ShortName>Derivatives and Hedging Instruments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/DerivativesAndHedgingInstruments</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2314301 - Disclosure - Fair Value of Assets and Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/FairValueOfAssetsAndLiabilitiesTables</Role>
      <ShortName>Fair Value of Assets and Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/FairValueOfAssetsAndLiabilities</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2315301 - Disclosure - Accumulated Other Comprehensive Income (Loss) (AOCI) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/AccumulatedOtherComprehensiveIncomeLossAociTables</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (AOCI) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/AccumulatedOtherComprehensiveIncomeLossAoci</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2316301 - Disclosure - Restructuring Plan (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/RestructuringPlanTables</Role>
      <ShortName>Restructuring Plan (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/RestructuringPlan</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2317301 - Disclosure - Supplemental Financial Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SupplementalFinancialInformationTables</Role>
      <ShortName>Supplemental Financial Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/SupplementalFinancialInformation</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2318301 - Disclosure - Condensed Consolidating Supplemental Guarantor Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatingSupplementalGuarantorInformationTables</Role>
      <ShortName>Condensed Consolidating Supplemental Guarantor Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.ncr.com/role/CondensedConsolidatingSupplementalGuarantorInformation</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2401403 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesTables</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2401404 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesContractAssetsAndLiabilitiesDetails</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2401406 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies Recent Accounting Pronouncements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BasisOfPresentationAndSummaryOfSignificantAccountingPoliciesRecentAccountingPronouncementsDetails</Role>
      <ShortName>Basis of Presentation and Summary of Significant Accounting Policies Recent Accounting Pronouncements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2402402 - Disclosure - Leasing - Lease Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/LeasingLeaseBalancesDetails</Role>
      <ShortName>Leasing - Lease Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2402403 - Disclosure - Leasing - Lease Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/LeasingLeaseCostsDetails</Role>
      <ShortName>Leasing - Lease Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2402404 - Disclosure - Leasing - Supplemental Cash Flow Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/LeasingSupplementalCashFlowInformationDetails</Role>
      <ShortName>Leasing - Supplemental Cash Flow Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2402405 - Disclosure - Leasing - Present Value of Lease Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/LeasingPresentValueOfLeaseLiabilitiesDetails</Role>
      <ShortName>Leasing - Present Value of Lease Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2402406 - Disclosure - Leasing - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/LeasingNarrativeDetails</Role>
      <ShortName>Leasing - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2402407 - Disclosure - Leasing - Weighted Average Remaining Lease Term and Interest Rate (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/LeasingWeightedAverageRemainingLeaseTermAndInterestRateDetails</Role>
      <ShortName>Leasing - Weighted Average Remaining Lease Term and Interest Rate (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - Business Combinations and Divestitures Purchase Price Allocation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BusinessCombinationsAndDivestituresPurchasePriceAllocationDetails</Role>
      <ShortName>Business Combinations and Divestitures Purchase Price Allocation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2403403 - Disclosure - Business Combinations and Divestitures Details (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BusinessCombinationsAndDivestituresDetailsDetails</Role>
      <ShortName>Business Combinations and Divestitures Details (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/BusinessCombinationsAndDivestituresNotes</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2403404 - Disclosure - Business Combinations and Divestitures Intangible assets acquired (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/BusinessCombinationsAndDivestituresIntangibleAssetsAcquiredDetails</Role>
      <ShortName>Business Combinations and Divestitures Intangible assets acquired (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Segment Information and Concentrations - Revenue and Operating Income By Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SegmentInformationAndConcentrationsRevenueAndOperatingIncomeBySegmentsDetails</Role>
      <ShortName>Segment Information and Concentrations - Revenue and Operating Income By Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2404403 - Disclosure - Segment Information and Concentrations - Revenue by Geography (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SegmentInformationAndConcentrationsRevenueByGeographyDetails</Role>
      <ShortName>Segment Information and Concentrations - Revenue by Geography (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2404404 - Disclosure - Segment Information and Concentrations - Revenue by Products and Services (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SegmentInformationAndConcentrationsRevenueByProductsAndServicesDetails</Role>
      <ShortName>Segment Information and Concentrations - Revenue by Products and Services (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Goodwill and Long-Lived Assets - Goodwill by Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/GoodwillAndLongLivedAssetsGoodwillBySegmentsDetails</Role>
      <ShortName>Goodwill and Long-Lived Assets - Goodwill by Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2405403 - Disclosure - Goodwill and Long-Lived Assets - Purchased Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/GoodwillAndLongLivedAssetsPurchasedIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and Long-Lived Assets - Purchased Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2405404 - Disclosure - Goodwill and Long-Lived Assets - Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/GoodwillAndLongLivedAssetsAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Long-Lived Assets - Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - Debt Obligations - Short-term Borrowings and Long-term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DebtObligationsShortTermBorrowingsAndLongTermDebtDetails</Role>
      <ShortName>Debt Obligations - Short-term Borrowings and Long-term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2406403 - Disclosure - Debt Obligations - Senior Secured Credit Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DebtObligationsSeniorSecuredCreditFacilityDetails</Role>
      <ShortName>Debt Obligations - Senior Secured Credit Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2406404 - Disclosure - Debt Obligations - Senior Unsecured Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.ncr.com/role/DebtObligationsSeniorUnsecuredNotesDetails</Role>
      <ShortName>Debt Obligations - Senior Unsecured Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2406405 - Disclosure - Debt Obligations - Trade Receivables Securitization Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DebtObligationsTradeReceivablesSecuritizationFacilityDetails</Role>
      <ShortName>Debt Obligations - Trade Receivables Securitization Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2406406 - Disclosure - Debt Obligations - Fair Value of Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DebtObligationsFairValueOfDebtDetails</Role>
      <ShortName>Debt Obligations - Fair Value of Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2407401 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/IncomeTaxes</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Stock Compensation Plans - Stock-based Compensation Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/StockCompensationPlansStockBasedCompensationExpenseDetails</Role>
      <ShortName>Stock Compensation Plans - Stock-based Compensation Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - Stock Compensation Plans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/StockCompensationPlansNarrativeDetails</Role>
      <ShortName>Stock Compensation Plans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2408404 - Disclosure - Stock Compensation Plans - Valuation Assumptions Used for Stock Options (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/StockCompensationPlansValuationAssumptionsUsedForStockOptionsDetails</Role>
      <ShortName>Stock Compensation Plans - Valuation Assumptions Used for Stock Options (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2409402 - Disclosure - Employee Benefit Plans - Pension Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EmployeeBenefitPlansPensionPlanDetails</Role>
      <ShortName>Employee Benefit Plans - Pension Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2409403 - Disclosure - Employee Benefit Plans - Postretirement Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EmployeeBenefitPlansPostretirementPlanDetails</Role>
      <ShortName>Employee Benefit Plans - Postretirement Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2409404 - Disclosure - Employee Benefit Plans - Postemployment Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EmployeeBenefitPlansPostemploymentPlanDetails</Role>
      <ShortName>Employee Benefit Plans - Postemployment Plan (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2409405 - Disclosure - Employee Benefit Plans - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EmployeeBenefitPlansNarrativeDetails</Role>
      <ShortName>Employee Benefit Plans - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - Commitments and Contingencies - Loss Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CommitmentsAndContingenciesLossContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies - Loss Contingencies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>2410403 - Disclosure - Commitments and Contingencies - Warranty Reserve (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CommitmentsAndContingenciesWarrantyReserveDetails</Role>
      <ShortName>Commitments and Contingencies - Warranty Reserve (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>2411401 - Disclosure - Series A Convertible Preferred Stock (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SeriesConvertiblePreferredStockDetails</Role>
      <ShortName>Series A Convertible Preferred Stock (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/SeriesConvertiblePreferredStock</ParentRole>
      <Position>76</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Earnings Per Share - Basic Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EarningsPerShareBasicEarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share - Basic Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - Earnings Per Share - Diluted Earnings Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/EarningsPerShareDilutedEarningsPerShareDetails</Role>
      <ShortName>Earnings Per Share - Diluted Earnings Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>2413402 - Disclosure - Derivatives and Hedging Instruments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DerivativesAndHedgingInstrumentsNarrativeDetails</Role>
      <ShortName>Derivatives and Hedging Instruments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>2413403 - Disclosure - Derivatives and Hedging Instruments - Derivative Fair Values (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DerivativesAndHedgingInstrumentsDerivativeFairValuesDetails</Role>
      <ShortName>Derivatives and Hedging Instruments - Derivative Fair Values (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>2413404 - Disclosure - Derivatives and Hedging Instruments - Gain (Loss) on Derivatives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DerivativesAndHedgingInstrumentsGainLossOnDerivativesDetails</Role>
      <ShortName>Derivatives and Hedging Instruments - Gain (Loss) on Derivatives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/DerivativesAndHedgingInstrumentsTables</ParentRole>
      <Position>81</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>2413405 - Disclosure - Derivatives and Hedging Instruments - Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/DerivativesAndHedgingInstrumentsGainLossOnDerivativesNotDesignatedAsHedgingInstrumentsDetails</Role>
      <ShortName>Derivatives and Hedging Instruments - Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/DerivativesAndHedgingInstrumentsTables</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>2414402 - Disclosure - Fair Value of Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/FairValueOfAssetsAndLiabilitiesDetails</Role>
      <ShortName>Fair Value of Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/FairValueOfAssetsAndLiabilitiesTables</ParentRole>
      <Position>83</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>2414403 - Disclosure - Fair Value of Assets and Liabilities Assets Measured at Fair Value on a Non-recurring basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/FairValueOfAssetsAndLiabilitiesAssetsMeasuredAtFairValueOnNonRecurringBasisDetails</Role>
      <ShortName>Fair Value of Assets and Liabilities Assets Measured at Fair Value on a Non-recurring basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>2415402 - Disclosure - Accumulated Other Comprehensive Income (Loss) (AOCI) - Changes in AOCI by Component (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/AccumulatedOtherComprehensiveIncomeLossAociChangesInAociByComponentDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (AOCI) - Changes in AOCI by Component (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/AccumulatedOtherComprehensiveIncomeLossAociTables</ParentRole>
      <Position>85</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>2415403 - Disclosure - Accumulated Other Comprehensive Income (Loss) (AOCI) - Reclassifications Out of AOCI (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/AccumulatedOtherComprehensiveIncomeLossAociReclassificationsOutOfAociDetails</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (AOCI) - Reclassifications Out of AOCI (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/AccumulatedOtherComprehensiveIncomeLossAociTables</ParentRole>
      <Position>86</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>2416402 - Disclosure - Restructuring Plan - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/RestructuringPlanNarrativeDetails</Role>
      <ShortName>Restructuring Plan - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>2416403 - Disclosure - Restructuring Plan - Employee Severance and Other Exit Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/RestructuringPlanEmployeeSeveranceAndOtherExitCostsDetails</Role>
      <ShortName>Restructuring Plan - Employee Severance and Other Exit Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>2417402 - Disclosure - Supplemental Financial Information - Components of Accounts Receivable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SupplementalFinancialInformationComponentsOfAccountsReceivableDetails</Role>
      <ShortName>Supplemental Financial Information - Components of Accounts Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>2417403 - Disclosure - Supplemental Financial Information - Components of Inventory (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/SupplementalFinancialInformationComponentsOfInventoryDetails</Role>
      <ShortName>Supplemental Financial Information - Components of Inventory (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>2418402 - Disclosure - Condensed Consolidating Supplemental Guarantor Information - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatingSupplementalGuarantorInformationNarrativeDetails</Role>
      <ShortName>Condensed Consolidating Supplemental Guarantor Information - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.ncr.com/role/CondensedConsolidatingSupplementalGuarantorInformationTables</ParentRole>
      <Position>91</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>2418403 - Disclosure - Condensed Consolidating Supplemental Guarantor Information - Statements of Operations and Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatingSupplementalGuarantorInformationStatementsOfOperationsAndComprehensiveIncomeLossDetails</Role>
      <ShortName>Condensed Consolidating Supplemental Guarantor Information - Statements of Operations and Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>2418404 - Disclosure - Condensed Consolidating Supplemental Guarantor Information - Balance Sheet (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatingSupplementalGuarantorInformationBalanceSheetDetails</Role>
      <ShortName>Condensed Consolidating Supplemental Guarantor Information - Balance Sheet (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="ncr-2019930x10q.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>2418405 - Disclosure - Condensed Consolidating Supplemental Guarantor Information - Statement of Cash Flows (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.ncr.com/role/CondensedConsolidatingSupplementalGuarantorInformationStatementOfCashFlowsDetails</Role>
      <ShortName>Condensed Consolidating Supplemental Guarantor Information - Statement of Cash Flows (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="10-Q" original="ncr-2019930x10q.htm">ncr-2019930x10q.htm</File>
    <File>exhibit311sec302ceocer.htm</File>
    <File>exhibit312sec302cfocer.htm</File>
    <File>exhibit32sec906ceoandc.htm</File>
    <File>exhibit41-firstamendme.htm</File>
    <File>ncr-20190930.xsd</File>
    <File>ncr-20190930_cal.xml</File>
    <File>ncr-20190930_def.xml</File>
    <File>ncr-20190930_lab.xml</File>
    <File>ncr-20190930_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>ncrbbpreferred2015a19.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy>http://fasb.org/us-gaap/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/srt/2019-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2019-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
