<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>189</ContextCount>
  <ElementCount>296</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>56</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>9952151 - Statement - Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/ConsolidatedStatementsofOperationsUnaudited</Role>
      <ShortName>Consolidated Statements of Operations (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>9952152 - Statement - Consolidated Statements of Comprehensive Income (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/ConsolidatedStatementsofComprehensiveIncomeUnaudited</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>9952153 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/CondensedConsolidatedBalanceSheetsUnaudited</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>9952154 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/CondensedConsolidatedBalanceSheetsUnauditedParentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>9952155 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/ConsolidatedStatementsofCashFlowsUnaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>9952156 - Statement - Consolidated Statements of Changes in Equity (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/ConsolidatedStatementsofChangesinEquityUnaudited</Role>
      <ShortName>Consolidated Statements of Changes in Equity (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>9952157 - Disclosure - BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/BASISOFPRESENTATION</Role>
      <ShortName>BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>9952158 - Disclosure - RECENT ACCOUNTING GUIDANCE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/RECENTACCOUNTINGGUIDANCE</Role>
      <ShortName>RECENT ACCOUNTING GUIDANCE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>9952159 - Disclosure - REVENUE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/REVENUE</Role>
      <ShortName>REVENUE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>9952160 - Disclosure - TRANSFORMATION, INTEGRATION AND OTHER CHARGES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/TRANSFORMATIONINTEGRATIONANDOTHERCHARGES</Role>
      <ShortName>TRANSFORMATION, INTEGRATION AND OTHER CHARGES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>9952161 - Disclosure - RELATIONSHIP WITH DUPONT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/RELATIONSHIPWITHDUPONT</Role>
      <ShortName>RELATIONSHIP WITH DUPONT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>9952162 - Disclosure - SUPPLEMENTARY INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SUPPLEMENTARYINFORMATION</Role>
      <ShortName>SUPPLEMENTARY INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>9952163 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>9952164 - Disclosure - EARNINGS PER SHARE CALCULATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/EARNINGSPERSHARECALCULATIONS</Role>
      <ShortName>EARNINGS PER SHARE CALCULATIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>9952165 - Disclosure - INVENTORIES - NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/INVENTORIESNET</Role>
      <ShortName>INVENTORIES - NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>9952166 - Disclosure - NONCONSOLIDATED AFFILIATES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/NONCONSOLIDATEDAFFILIATES</Role>
      <ShortName>NONCONSOLIDATED AFFILIATES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>9952167 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/GOODWILLANDOTHERINTANGIBLEASSETS</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>9952168 - Disclosure - SHORT-TERM BORROWINGS, LONG-TERM DEBT, AND AVAILABLE CREDIT FACILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SHORTTERMBORROWINGSLONGTERMDEBTANDAVAILABLECREDITFACILITIES</Role>
      <ShortName>SHORT-TERM BORROWINGS, LONG-TERM DEBT, AND AVAILABLE CREDIT FACILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>9952169 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/COMMITMENTSANDCONTINGENTLIABILITIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENT LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>9952170 - Disclosure - STOCKHOLDERS' EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/STOCKHOLDERSEQUITY</Role>
      <ShortName>STOCKHOLDERS' EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>9952171 - Disclosure - PENSION PLANS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/PENSIONPLANS</Role>
      <ShortName>PENSION PLANS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9952172 - Disclosure - STOCK-BASED COMPENSATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/STOCKBASEDCOMPENSATION</Role>
      <ShortName>STOCK-BASED COMPENSATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9952173 - Disclosure - FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/FINANCIALINSTRUMENTS</Role>
      <ShortName>FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9952174 - Disclosure - FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/FAIRVALUEMEASUREMENTS</Role>
      <ShortName>FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9952175 - Disclosure - SEGMENT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SEGMENTINFORMATION</Role>
      <ShortName>SEGMENT INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9955511 - Disclosure - BASIS OF PRESENTATION (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/BASISOFPRESENTATIONPolicies</Role>
      <ShortName>BASIS OF PRESENTATION (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9955512 - Disclosure - REVENUE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/REVENUETables</Role>
      <ShortName>REVENUE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/REVENUE</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9955513 - Disclosure - TRANSFORMATION, INTEGRATION AND OTHER CHARGES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/TRANSFORMATIONINTEGRATIONANDOTHERCHARGESTables</Role>
      <ShortName>TRANSFORMATION, INTEGRATION AND OTHER CHARGES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/TRANSFORMATIONINTEGRATIONANDOTHERCHARGES</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9955514 - Disclosure - RELATIONSHIP WITH DUPONT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/RELATIONSHIPWITHDUPONTTables</Role>
      <ShortName>RELATIONSHIP WITH DUPONT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/RELATIONSHIPWITHDUPONT</ParentRole>
      <Position>31</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9955515 - Disclosure - SUPPLEMENTARY INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SUPPLEMENTARYINFORMATIONTables</Role>
      <ShortName>SUPPLEMENTARY INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/SUPPLEMENTARYINFORMATION</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9955516 - Disclosure - EARNINGS PER SHARE CALCULATIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/EARNINGSPERSHARECALCULATIONSTables</Role>
      <ShortName>EARNINGS PER SHARE CALCULATIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/EARNINGSPERSHARECALCULATIONS</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9955517 - Disclosure - INVENTORIES - NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/INVENTORIESNETTables</Role>
      <ShortName>INVENTORIES - NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/INVENTORIESNET</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9955518 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/GOODWILLANDOTHERINTANGIBLEASSETSTables</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/GOODWILLANDOTHERINTANGIBLEASSETS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9955519 - Disclosure - STOCKHOLDERS' EQUITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/STOCKHOLDERSEQUITYTables</Role>
      <ShortName>STOCKHOLDERS' EQUITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/STOCKHOLDERSEQUITY</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9955520 - Disclosure - PENSION PLANS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/PENSIONPLANSTables</Role>
      <ShortName>PENSION PLANS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/PENSIONPLANS</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9955521 - Disclosure - FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/FINANCIALINSTRUMENTSTables</Role>
      <ShortName>FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/FINANCIALINSTRUMENTS</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9955522 - Disclosure - FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/FAIRVALUEMEASUREMENTSTables</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/FAIRVALUEMEASUREMENTS</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9955523 - Disclosure - SEGMENT INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SEGMENTINFORMATIONTables</Role>
      <ShortName>SEGMENT INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/SEGMENTINFORMATION</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9955524 - Disclosure - BASIS OF PRESENTATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/BASISOFPRESENTATIONDetails</Role>
      <ShortName>BASIS OF PRESENTATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/BASISOFPRESENTATIONPolicies</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9955525 - Disclosure - REVENUE - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/REVENUENarrativeDetails</Role>
      <ShortName>REVENUE - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9955526 - Disclosure - REVENUE - Schedule of Disaggregation of Revenue (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/REVENUEScheduleofDisaggregationofRevenueDetails</Role>
      <ShortName>REVENUE - Schedule of Disaggregation of Revenue (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9955527 - Disclosure - REVENUE - Schedule of Contract Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/REVENUEScheduleofContractBalancesDetails</Role>
      <ShortName>REVENUE - Schedule of Contract Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9955528 - Disclosure - TRANSFORMATION, INTEGRATION AND OTHER CHARGES - Schedule of Reclassification of Prior-Period Amounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/TRANSFORMATIONINTEGRATIONANDOTHERCHARGESScheduleofReclassificationofPriorPeriodAmountsDetails</Role>
      <ShortName>TRANSFORMATION, INTEGRATION AND OTHER CHARGES - Schedule of Reclassification of Prior-Period Amounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9955529 - Disclosure - TRANSFORMATION, INTEGRATION AND OTHER CHARGES - Schedule of Transformation, Integration and Other Charges by Cost Category (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/TRANSFORMATIONINTEGRATIONANDOTHERCHARGESScheduleofTransformationIntegrationandOtherChargesbyCostCategoryDetails</Role>
      <ShortName>TRANSFORMATION, INTEGRATION AND OTHER CHARGES - Schedule of Transformation, Integration and Other Charges by Cost Category (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9955530 - Disclosure - TRANSFORMATION, INTEGRATION AND OTHER CHARGES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/TRANSFORMATIONINTEGRATIONANDOTHERCHARGESNarrativeDetails</Role>
      <ShortName>TRANSFORMATION, INTEGRATION AND OTHER CHARGES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9955531 - Disclosure - RELATIONSHIP WITH DUPONT - Schedule of Corporate Expense Allocations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/RELATIONSHIPWITHDUPONTScheduleofCorporateExpenseAllocationsDetails</Role>
      <ShortName>RELATIONSHIP WITH DUPONT - Schedule of Corporate Expense Allocations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9955532 - Disclosure - RELATIONSHIP WITH DUPONT - Schedule of Parent Company Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/RELATIONSHIPWITHDUPONTScheduleofParentCompanyEquityDetails</Role>
      <ShortName>RELATIONSHIP WITH DUPONT - Schedule of Parent Company Equity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9955533 - Disclosure - SUPPLEMENTARY INFORMATION - Schedule of Sundry Income (Expense) - Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SUPPLEMENTARYINFORMATIONScheduleofSundryIncomeExpenseNetDetails</Role>
      <ShortName>SUPPLEMENTARY INFORMATION - Schedule of Sundry Income (Expense) - Net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9955534 - Disclosure - SUPPLEMENTARY INFORMATION - Schedule of Accrued and Other Current Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SUPPLEMENTARYINFORMATIONScheduleofAccruedandOtherCurrentLiabilitiesDetails</Role>
      <ShortName>SUPPLEMENTARY INFORMATION - Schedule of Accrued and Other Current Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9955535 - Disclosure - SUPPLEMENTARY INFORMATION - Schedule of Supplemental Balance Sheet Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SUPPLEMENTARYINFORMATIONScheduleofSupplementalBalanceSheetInformationDetails</Role>
      <ShortName>SUPPLEMENTARY INFORMATION - Schedule of Supplemental Balance Sheet Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9955536 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/INCOMETAXESDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/INCOMETAXES</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9955537 - Disclosure - EARNINGS PER SHARE CALCULATIONS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/EARNINGSPERSHARECALCULATIONSNarrativeDetails</Role>
      <ShortName>EARNINGS PER SHARE CALCULATIONS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>9955538 - Disclosure - EARNINGS PER SHARE CALCULATIONS - Schedule of Net Income for Earnings Per Share Calculations - Basic &amp; Diluted (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/EARNINGSPERSHARECALCULATIONSScheduleofNetIncomeforEarningsPerShareCalculationsBasicDilutedDetails</Role>
      <ShortName>EARNINGS PER SHARE CALCULATIONS - Schedule of Net Income for Earnings Per Share Calculations - Basic &amp; Diluted (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>9955539 - Disclosure - INVENTORIES - NET (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/INVENTORIESNETDetails</Role>
      <ShortName>INVENTORIES - NET (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/INVENTORIESNETTables</ParentRole>
      <Position>56</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>9955540 - Disclosure - NONCONSOLIDATED AFFILIATES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/NONCONSOLIDATEDAFFILIATESDetails</Role>
      <ShortName>NONCONSOLIDATED AFFILIATES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/NONCONSOLIDATEDAFFILIATES</ParentRole>
      <Position>57</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>9955541 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofGoodwillDetails</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>9955542 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofOtherIntangibleAssetsDetails</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Other Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>9955543 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Intangibles by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofIntangiblesbySegmentDetails</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Intangibles by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>9955544 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Estimated Future Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofEstimatedFutureAmortizationExpenseDetails</Role>
      <ShortName>GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Estimated Future Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>9955545 - Disclosure - SHORT-TERM BORROWINGS, LONG-TERM DEBT, AND AVAILABLE CREDIT FACILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SHORTTERMBORROWINGSLONGTERMDEBTANDAVAILABLECREDITFACILITIESDetails</Role>
      <ShortName>SHORT-TERM BORROWINGS, LONG-TERM DEBT, AND AVAILABLE CREDIT FACILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/SHORTTERMBORROWINGSLONGTERMDEBTANDAVAILABLECREDITFACILITIES</ParentRole>
      <Position>62</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>9955546 - Disclosure - COMMITMENTS AND CONTINGENT LIABILITIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/COMMITMENTSANDCONTINGENTLIABILITIESDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENT LIABILITIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/COMMITMENTSANDCONTINGENTLIABILITIES</ParentRole>
      <Position>63</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>9955547 - Disclosure - STOCKHOLDERS' EQUITY - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/STOCKHOLDERSEQUITYNarrativeDetails</Role>
      <ShortName>STOCKHOLDERS' EQUITY - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>9955548 - Disclosure - STOCKHOLDERS' EQUITY - Schedule of Accumulated Other Comprehensive Loss (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/STOCKHOLDERSEQUITYScheduleofAccumulatedOtherComprehensiveLossDetails</Role>
      <ShortName>STOCKHOLDERS' EQUITY - Schedule of Accumulated Other Comprehensive Loss (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>9955549 - Disclosure - PENSION PLANS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/PENSIONPLANSDetails</Role>
      <ShortName>PENSION PLANS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/PENSIONPLANSTables</ParentRole>
      <Position>66</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>9955550 - Disclosure - STOCK-BASED COMPENSATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/STOCKBASEDCOMPENSATIONDetails</Role>
      <ShortName>STOCK-BASED COMPENSATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/STOCKBASEDCOMPENSATION</ParentRole>
      <Position>67</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>9955551 - Disclosure - FINANCIAL INSTRUMENTS - Schedule of Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/FINANCIALINSTRUMENTSScheduleofFairValueofFinancialInstrumentsDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS - Schedule of Fair Value of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>9955552 - Disclosure - FINANCIAL INSTRUMENTS - Schedule of Notional Amounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/FINANCIALINSTRUMENTSScheduleofNotionalAmountsDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS - Schedule of Notional Amounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>9955553 - Disclosure - FINANCIAL INSTRUMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/FINANCIALINSTRUMENTSNarrativeDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>9955554 - Disclosure - FAIR VALUE MEASUREMENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/FAIRVALUEMEASUREMENTSDetails</Role>
      <ShortName>FAIR VALUE MEASUREMENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.qnityelectronics.com/role/FAIRVALUEMEASUREMENTSTables</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>9955555 - Disclosure - SEGMENT INFORMATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SEGMENTINFORMATIONNarrativeDetails</Role>
      <ShortName>SEGMENT INFORMATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>9955556 - Disclosure - SEGMENT INFORMATION - Schedule of Segment Revenue, Significant Segment Expenses and Segment Operating EBITDA (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SEGMENTINFORMATIONScheduleofSegmentRevenueSignificantSegmentExpensesandSegmentOperatingEBITDADetails</Role>
      <ShortName>SEGMENT INFORMATION - Schedule of Segment Revenue, Significant Segment Expenses and Segment Operating EBITDA (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>9955557 - Disclosure - SEGMENT INFORMATION - Schedule of Reconciliation of Segment Operating EBITDA to Income from Continuing Operations Before Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SEGMENTINFORMATIONScheduleofReconciliationofSegmentOperatingEBITDAtoIncomefromContinuingOperationsBeforeIncomeTaxesDetails</Role>
      <ShortName>SEGMENT INFORMATION - Schedule of Reconciliation of Segment Operating EBITDA to Income from Continuing Operations Before Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>9955558 - Disclosure - SEGMENT INFORMATION - Schedule of Significant Items by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SEGMENTINFORMATIONScheduleofSignificantItemsbySegmentDetails</Role>
      <ShortName>SEGMENT INFORMATION - Schedule of Significant Items by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>9955559 - Disclosure - SEGMENT INFORMATION - Schedule of Segment and Corporate Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SEGMENTINFORMATIONScheduleofSegmentandCorporateInformationDetails</Role>
      <ShortName>SEGMENT INFORMATION - Schedule of Segment and Corporate Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="q-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>9955560 - Disclosure - SEGMENT INFORMATION -Schedule of Capital Expenditure Reconciliation to Unaudited Interim Consolidated Financial Statements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.qnityelectronics.com/role/SEGMENTINFORMATIONScheduleofCapitalExpenditureReconciliationtoUnauditedInterimConsolidatedFinancialStatementsDetails</Role>
      <ShortName>SEGMENT INFORMATION -Schedule of Capital Expenditure Reconciliation to Unaudited Interim Consolidated Financial Statements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</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" isDefinitelyFs="true" isUsgaap="true" original="q-20260331.htm">q-20260331.htm</File>
    <File>q-20260331.xsd</File>
    <File>q-20260331_cal.xml</File>
    <File>q-20260331_def.xml</File>
    <File>q-20260331_lab.xml</File>
    <File>q-20260331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="6">http://fasb.org/srt/2025</BaseTaxonomy>
    <BaseTaxonomy items="623">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
