<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:ck0001048607="http://www.lincolnfinancial.com/20260710"
  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:vip="http://xbrl.sec.gov/vip/2026"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ck0001048607-20260710.xsd" xlink:type="simple"/>
    <context id="c0">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001048607</identifier>
        </entity>
        <period>
            <startDate>2026-07-10</startDate>
            <endDate>2026-07-10</endDate>
        </period>
    </context>
    <context id="c1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001048607</identifier>
            <segment>
                <xbrldi:explicitMember dimension="vip:PortfolioCompanyAxis">ck0001048607:LVIPBlackRockGrowthETFAllocationManagedRiskFundMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-07-10</startDate>
            <endDate>2026-07-10</endDate>
        </period>
    </context>
    <dei:EntityRegistrantName contextRef="c0" id="ixv-14">Lincoln Life Flexible Premium Variable Life Account M</dei:EntityRegistrantName>
    <dei:DocumentPeriodEndDate contextRef="c0" id="ixv-157">2026-07-10</dei:DocumentPeriodEndDate>
    <vip:PortfolioCompaniesN6TextBlock contextRef="c0" id="ixv-132">&lt;div&gt; &lt;span style="font-family: Arial; font-size: 10.0pt;"&gt;The changes described in this Supplement affect Appendix A: Funds Available Under The Policy. &lt;/span&gt; &lt;/div&gt;
  &lt;div style="font-size: 10pt;"&gt;&#160;
  &lt;/div&gt;
  &lt;div&gt; &lt;span style="font-family: Arial; font-size: 10.0pt; font-weight: bold;"&gt;Fund Name Change:&lt;/span&gt;&lt;span style="font-family: Arial; font-size: 10.0pt;"&gt; Effective August 1, 2026, the fund currently named &lt;/span&gt;&lt;span style="font-family: Arial; font-size: 10.0pt; font-weight: bold;"&gt;LVIP BlackRock Global Growth ETF Allocation Managed Risk Fund&lt;/span&gt;&lt;span style="font-family: Arial; font-size: 10.0pt;"&gt; will be renamed &lt;/span&gt;&lt;span style="font-family: Arial; font-size: 10.0pt; font-weight: bold;"&gt;LVIP BlackRock Growth ETF Allocation Managed Risk Fund&lt;/span&gt;&lt;span style="font-family: Arial; font-size: 10.0pt;"&gt;. All references to the fund in the Prospectus will be revised accordingly. The fund&#x2019;s investment objective, fee and average total returns will not change.&lt;/span&gt; &lt;/div&gt;</vip:PortfolioCompaniesN6TextBlock>
    <vip:ProspectusesAvailableTextBlock contextRef="c0" id="ixv-133">&lt;div&gt; &lt;span style="font-family: Arial; font-size: 10.0pt;"&gt;The changes described in this Supplement affect Appendix A: Funds Available Under The Policy. &lt;/span&gt; &lt;/div&gt;</vip:ProspectusesAvailableTextBlock>
    <vip:PortfolioCompanyNameTextBlock contextRef="c1" id="ixv-142">&lt;span style="font-family: Arial; font-size: 10.0pt; font-weight: bold;"&gt;LVIP BlackRock Growth ETF Allocation Managed Risk Fund&lt;/span&gt;.</vip:PortfolioCompanyNameTextBlock>
    <dei:DocumentType contextRef="c0" id="ixv-161">N-6</dei:DocumentType>
    <dei:EntityInvCompanyType contextRef="c0" id="ixv-162">N-6</dei:EntityInvCompanyType>
    <dei:EntityCentralIndexKey contextRef="c0" id="ixv-163">0001048607</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag contextRef="c0" id="ixv-164">false</dei:AmendmentFlag>
</xbrl>
