<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.23.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>218</ContextCount>
  <ElementCount>196</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>77</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>11</UnitCount>
  <MyReports>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>00100 - Statement - CONDENSED CONSOLIDATED INCOME STATEMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/StatementCondensedConsolidatedIncomeStatement</Role>
      <ShortName>CONDENSED CONSOLIDATED INCOME STATEMENT</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>00200 - Statement - CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/StatementCondensedConsolidatedStatementOfComprehensiveIncome</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00300 - Statement - CONDENSED CONSOLIDATED BALANCE SHEET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/StatementCondensedConsolidatedBalanceSheet</Role>
      <ShortName>CONDENSED CONSOLIDATED BALANCE SHEET</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00400 - Statement - CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/StatementCondensedConsolidatedStatementOfChangesInEquity</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>00405 - Statement - CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/StatementCondensedConsolidatedStatementOfChangesInEquityParenthetical</Role>
      <ShortName>CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>00500 - Statement - CONDENSED CONSOLIDATED CASH FLOW STATEMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/StatementCondensedConsolidatedCashFlowStatement</Role>
      <ShortName>CONDENSED CONSOLIDATED CASH FLOW STATEMENT</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>10101 - Disclosure - BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBasisOfPreparationAndSignificantAccountingPolicies</Role>
      <ShortName>BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>10201 - Disclosure - REVENUE AND SEGMENT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureRevenueAndSegmentInformation</Role>
      <ShortName>REVENUE AND SEGMENT INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>10301 - Disclosure - IMPAIRMENT REVIEW</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureImpairmentReview</Role>
      <ShortName>IMPAIRMENT REVIEW</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>10401 - Disclosure - RESTRUCTURING, SEPARATION AND ADMISSION COSTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureRestructuringSeparationAndAdmissionCosts</Role>
      <ShortName>RESTRUCTURING, SEPARATION AND ADMISSION COSTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>10501 - Disclosure - TAX</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureTax</Role>
      <ShortName>TAX</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>10601 - Disclosure - DIVIDENDS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureDividends</Role>
      <ShortName>DIVIDENDS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>10701 - Disclosure - EARNINGS PER SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureEarningsPerShare</Role>
      <ShortName>EARNINGS PER SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>10801 - Disclosure - FINANCIAL INSTRUMENTS AND RELATED DISCLOSURES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureFinancialInstrumentsAndRelatedDisclosures</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND RELATED DISCLOSURES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>10901 - Disclosure - BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBorrowings</Role>
      <ShortName>BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>11001 - Disclosure - SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureShareCapitalSharePremiumAndOtherReserves</Role>
      <ShortName>SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>11101 - Disclosure - CONTINGENT LIABILITIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureContingentLiabilities</Role>
      <ShortName>CONTINGENT LIABILITIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>11201 - Disclosure - ACQUISITION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureAcquisition</Role>
      <ShortName>ACQUISITION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>11301 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>11401 - Disclosure - POST BALANCE SHEET EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosurePostBalanceSheetEvents</Role>
      <ShortName>POST BALANCE SHEET EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>20102 - Disclosure - BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBasisOfPreparationAndSignificantAccountingPoliciesPolicies</Role>
      <ShortName>BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>30103 - Disclosure - BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBasisOfPreparationAndSignificantAccountingPoliciesTables</Role>
      <ShortName>BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureBasisOfPreparationAndSignificantAccountingPolicies</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>30203 - Disclosure - REVENUE AND SEGMENT INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureRevenueAndSegmentInformationTables</Role>
      <ShortName>REVENUE AND SEGMENT INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureRevenueAndSegmentInformation</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>30603 - Disclosure - DIVIDENDS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureDividendsTables</Role>
      <ShortName>DIVIDENDS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureDividends</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>30703 - Disclosure - EARNINGS PER SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureEarningsPerShareTables</Role>
      <ShortName>EARNINGS PER SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureEarningsPerShare</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>30803 - Disclosure - FINANCIAL INSTRUMENTS AND RELATED DISCLOSURES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureFinancialInstrumentsAndRelatedDisclosuresTables</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND RELATED DISCLOSURES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureFinancialInstrumentsAndRelatedDisclosures</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>30903 - Disclosure - BORROWINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBorrowingsTables</Role>
      <ShortName>BORROWINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureBorrowings</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>31003 - Disclosure - SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureShareCapitalSharePremiumAndOtherReservesTables</Role>
      <ShortName>SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureShareCapitalSharePremiumAndOtherReserves</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>40101 - Disclosure - BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES- Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBasisOfPreparationAndSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES- Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureBasisOfPreparationAndSignificantAccountingPoliciesTables</ParentRole>
      <Position>30</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>40102 - Disclosure - BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES - Exchange rates (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBasisOfPreparationAndSignificantAccountingPoliciesExchangeRatesDetails</Role>
      <ShortName>BASIS OF PREPARATION AND SIGNIFICANT ACCOUNTING POLICIES - Exchange rates (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>40201 - Disclosure - REVENUE AND SEGMENT INFORMATION - Analysis of revenue and adjusted operating profit by geographical segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureRevenueAndSegmentInformationAnalysisOfRevenueAndAdjustedOperatingProfitByGeographicalSegmentDetails</Role>
      <ShortName>REVENUE AND SEGMENT INFORMATION - Analysis of revenue and adjusted operating profit by geographical segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>40202 - Disclosure - REVENUE AND SEGMENT INFORMATION - Analysis of revenue by product (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureRevenueAndSegmentInformationAnalysisOfRevenueByProductDetails</Role>
      <ShortName>REVENUE AND SEGMENT INFORMATION - Analysis of revenue by product (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>40301 - Disclosure - IMPAIRMENT REVIEW (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureImpairmentReviewDetails</Role>
      <ShortName>IMPAIRMENT REVIEW (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureImpairmentReview</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>40401 - Disclosure - RESTRUCTURING, SEPARATION AND ADMISSION COSTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureRestructuringSeparationAndAdmissionCostsDetails</Role>
      <ShortName>RESTRUCTURING, SEPARATION AND ADMISSION COSTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureRestructuringSeparationAndAdmissionCosts</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>40601 - Disclosure - DIVIDENDS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureDividendsDetails</Role>
      <ShortName>DIVIDENDS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureDividendsTables</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>40701 - Disclosure - EARNINGS PER SHARE - Narratives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureEarningsPerShareNarrativesDetails</Role>
      <ShortName>EARNINGS PER SHARE - Narratives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>40702 - Disclosure - EARNINGS PER SHARE - Summary of weighted average number of shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureEarningsPerShareSummaryOfWeightedAverageNumberOfSharesDetails</Role>
      <ShortName>EARNINGS PER SHARE - Summary of weighted average number of shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>40801 - Disclosure - FINANCIAL INSTRUMENTS AND RELATED DISCLOSURES - Financial instruments held at fair value by fair value hierarchy (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureFinancialInstrumentsAndRelatedDisclosuresFinancialInstrumentsHeldAtFairValueByFairValueHierarchyDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND RELATED DISCLOSURES - Financial instruments held at fair value by fair value hierarchy (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>40802 - Disclosure - FINANCIAL INSTRUMENTS AND RELATED DISCLOSURES - Carrying value and fair value of financial instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureFinancialInstrumentsAndRelatedDisclosuresCarryingValueAndFairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>FINANCIAL INSTRUMENTS AND RELATED DISCLOSURES - Carrying value and fair value of financial instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>40901 - Disclosure - BORROWINGS - Composition of borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBorrowingsCompositionOfBorrowingsDetails</Role>
      <ShortName>BORROWINGS - Composition of borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>40902 - Disclosure - BORROWINGS - Short term borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBorrowingsShortTermBorrowingsDetails</Role>
      <ShortName>BORROWINGS - Short term borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>40903 - Disclosure - BORROWINGS - Long term borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBorrowingsLongTermBorrowingsDetails</Role>
      <ShortName>BORROWINGS - Long term borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>40904 - Disclosure - BORROWINGS - Committed credit facilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBorrowingsCommittedCreditFacilitiesDetails</Role>
      <ShortName>BORROWINGS - Committed credit facilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>40905 - Disclosure - BORROWINGS - Reconciliation of movement in financial liabilities to cash flow statement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureBorrowingsReconciliationOfMovementInFinancialLiabilitiesToCashFlowStatementDetails</Role>
      <ShortName>BORROWINGS - Reconciliation of movement in financial liabilities to cash flow statement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>41001 - Disclosure - SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES - Narratives (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureShareCapitalSharePremiumAndOtherReservesNarrativesDetails</Role>
      <ShortName>SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES - Narratives (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>41002 - Disclosure - SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES - Other Reserves (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureShareCapitalSharePremiumAndOtherReservesOtherReservesDetails</Role>
      <ShortName>SHARE CAPITAL, SHARE PREMIUM AND OTHER RESERVES - Other Reserves (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>41201 - Disclosure - ACQUISITION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosureAcquisitionDetails</Role>
      <ShortName>ACQUISITION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosureAcquisition</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="hln-20230630xex99d1.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>41401 - Disclosure - POST BALANCE SHEET EVENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://hln-20f.com/role/DisclosurePostBalanceSheetEventsDetails</Role>
      <ShortName>POST BALANCE SHEET EVENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://hln-20f.com/role/DisclosurePostBalanceSheetEvents</ParentRole>
      <Position>49</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="6-K" original="hln-20230630xex99d1.htm">hln-20230630xex99d1.htm</File>
    <File>hln-20230630.xsd</File>
    <File>hln-20230630_cal.xml</File>
    <File>hln-20230630_def.xml</File>
    <File>hln-20230630_lab.xml</File>
    <File>hln-20230630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>hln-20230630xex99d1001.jpg</File>
    <File>hln-20230630xex99d1002.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="8">http://xbrl.sec.gov/dei/2022</BaseTaxonomy>
    <BaseTaxonomy items="560">https://xbrl.ifrs.org/taxonomy/2022-03-24/ifrs-full</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
