<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.25.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>1984</ContextCount>
  <ElementCount>38</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>43</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="d934843dncsr.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>030000 - Disclosure - Form N-CSR Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/NcsrCover</Role>
      <ShortName>Form N-CSR Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="d934843dncsr.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>030001 - Disclosure - Shareholder Report</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/ShareholderReport</Role>
      <ShortName>Shareholder Report</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="d934843dncsr.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>040010 - Disclosure - Shareholder Report, Line Graph (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails</Role>
      <ShortName>Shareholder Report, Line Graph (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="d934843dncsr.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>040015 - Disclosure - Shareholder Report, Average Annual Return (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails</Role>
      <ShortName>Shareholder Report, Average Annual Return (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="d934843dncsr.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>040020 - Disclosure - Shareholder Report, Holdings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails</Role>
      <ShortName>Shareholder Report, Holdings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>5</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="N-CSR" isDefinitelyNotFs="true" isNcsr="true" isOEF="true" isRRorOEF="true" isUsgaap="true" original="d934843dncsr.htm">d934843dncsr.htm</File>
    <File>natixis-20241231.xsd</File>
  </InputFiles>
  <SupplementalFiles>
    <File>g934843i0ad2a9e53faa0bdf858e.jpg</File>
    <File>g934843i1857b61cdc1aa08dc624.jpg</File>
    <File>g934843i1d36e3cfa411ad421e7b.jpg</File>
    <File>g934843i1ec14a875a46abde5beb.jpg</File>
    <File>g934843i31e10b6192e1fc5093f2.jpg</File>
    <File>g934843i4249a7712648ae935d9e.jpg</File>
    <File>g934843i432b5dcd2ec7aa9cf688.jpg</File>
    <File>g934843i4378fa3abee0e5a9ed96.jpg</File>
    <File>g934843i559c0c71a85adf1b0f5f.jpg</File>
    <File>g934843i5c72ac66d2f0431f9da4.jpg</File>
    <File>g934843i6a4f90a8d028b5593104.jpg</File>
    <File>g934843i7456585eb75643a4f5ed.jpg</File>
    <File>g934843i8588f7ec9ae7921341e3.jpg</File>
    <File>g934843i9184bbcd646ad816b061.jpg</File>
    <File>g934843i9855d8907d6b24fbaafe.jpg</File>
    <File>g934843i9bae6f7f0741aaabea08.jpg</File>
    <File>g934843ia4654e980f5cc6b036ab.jpg</File>
    <File>g934843iad33db9c937e58338d20.jpg</File>
    <File>g934843ibef6b63aa877616f076f.jpg</File>
    <File>g934843ic27013e1ec42363c9612.jpg</File>
    <File>g934843iceb8156b2a2f73a33d0f.jpg</File>
    <File>g934843icfc1b43248c693fdf3f7.jpg</File>
    <File>g934843id4c81bf0ea444ee5c1fd.jpg</File>
    <File>g934843id8a6a757a2a400fe02f2.jpg</File>
    <File>g934843ide74c4c4dcc9d56af1e7.jpg</File>
    <File>g934843idff6c8299065f2e77cd9.jpg</File>
    <File>g934843img930e24582.gif</File>
    <File>g934843img9b3ade5f1.gif</File>
    <File>g934843imgfee98c233.gif</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="10">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="16">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="2108">http://xbrl.sec.gov/oef/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
