<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:nyli="http://www.newyorklife.com/20260624"
  xmlns:vip="http://xbrl.sec.gov/vip/2025"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="nyli-20260624.xsd" xlink:type="simple"/>
    <context id="D_30Jun2026_30Jun2026">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000906982</identifier>
        </entity>
        <period>
            <startDate>2026-06-30</startDate>
            <endDate>2026-06-30</endDate>
        </period>
    </context>
    <context id="C000236402">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000906982</identifier>
            <segment>
                <xbrldi:explicitMember dimension="vip:ContractAxis">nyli:C000236402Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-30</startDate>
            <endDate>2026-06-30</endDate>
        </period>
    </context>
    <context id="C000025667">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000906982</identifier>
            <segment>
                <xbrldi:explicitMember dimension="vip:ContractAxis">nyli:C000025667Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-30</startDate>
            <endDate>2026-06-30</endDate>
        </period>
    </context>
    <context id="C000199093">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000906982</identifier>
            <segment>
                <xbrldi:explicitMember dimension="vip:ContractAxis">nyli:C000199093Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-30</startDate>
            <endDate>2026-06-30</endDate>
        </period>
    </context>
    <context id="C000131810">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000906982</identifier>
            <segment>
                <xbrldi:explicitMember dimension="vip:ContractAxis">nyli:C000131810Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-30</startDate>
            <endDate>2026-06-30</endDate>
        </period>
    </context>
    <context id="C000058633">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000906982</identifier>
            <segment>
                <xbrldi:explicitMember dimension="vip:ContractAxis">nyli:C000058633Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-30</startDate>
            <endDate>2026-06-30</endDate>
        </period>
    </context>
    <context id="C000034211">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000906982</identifier>
            <segment>
                <xbrldi:explicitMember dimension="vip:ContractAxis">nyli:C000034211Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-30</startDate>
            <endDate>2026-06-30</endDate>
        </period>
    </context>
    <context id="C000065290">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0000906982</identifier>
            <segment>
                <xbrldi:explicitMember dimension="vip:ContractAxis">nyli:C000065290Member</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-06-30</startDate>
            <endDate>2026-06-30</endDate>
        </period>
    </context>
    <dei:EntityRegistrantName contextRef="D_30Jun2026_30Jun2026" id="apid_1">NEW YORK LIFE INS &amp; ANNUITY CORP VAR UNIV LIFE SEP ACC I</dei:EntityRegistrantName>
    <dei:EntityCentralIndexKey contextRef="D_30Jun2026_30Jun2026" id="apid_2">0000906982</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag contextRef="D_30Jun2026_30Jun2026" id="apid_3">false</dei:AmendmentFlag>
    <dei:EntityInvCompanyType contextRef="D_30Jun2026_30Jun2026" id="apid_7">N-6</dei:EntityInvCompanyType>
    <dei:DocumentType contextRef="D_30Jun2026_30Jun2026" id="apid_8">N-6</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="D_30Jun2026_30Jun2026"
      id="apid_0296a7ef-b83c-4d7a-a79e-eecc0bdfe5cc">2026-06-30</dei:DocumentPeriodEndDate>
    <vip:PortfolioCompaniesN6TextBlock
      contextRef="C000236402"
      id="f8b952a0-6cc3-4b18-bde8-4b60b2917537">&lt;span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:12pt;"&gt;All references to Western Asset Management Company Ltd. as a subadviser to the Western Asset Core Plus VIT &lt;/span&gt;&lt;span style="color:#000000;font-family:Arial;font-size:10pt;"&gt;Portfolio &#x2013; Class I are deleted.&lt;/span&gt;</vip:PortfolioCompaniesN6TextBlock>
    <vip:PortfolioCompaniesN6TextBlock
      contextRef="C000025667"
      id="ixgf8b952a0-6cc3-4b18-bde8-4b60b2917537_1">&lt;span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:12pt;"&gt;All references to Western Asset Management Company Ltd. as a subadviser to the Western Asset Core Plus VIT &lt;/span&gt;&lt;span style="color:#000000;font-family:Arial;font-size:10pt;"&gt;Portfolio &#x2013; Class I are deleted.&lt;/span&gt;</vip:PortfolioCompaniesN6TextBlock>
    <vip:PortfolioCompaniesN6TextBlock
      contextRef="C000199093"
      id="ixgf8b952a0-6cc3-4b18-bde8-4b60b2917537_2">&lt;span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:12pt;"&gt;All references to Western Asset Management Company Ltd. as a subadviser to the Western Asset Core Plus VIT &lt;/span&gt;&lt;span style="color:#000000;font-family:Arial;font-size:10pt;"&gt;Portfolio &#x2013; Class I are deleted.&lt;/span&gt;</vip:PortfolioCompaniesN6TextBlock>
    <vip:PortfolioCompaniesN6TextBlock
      contextRef="C000131810"
      id="ixgf8b952a0-6cc3-4b18-bde8-4b60b2917537_3">&lt;span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:12pt;"&gt;All references to Western Asset Management Company Ltd. as a subadviser to the Western Asset Core Plus VIT &lt;/span&gt;&lt;span style="color:#000000;font-family:Arial;font-size:10pt;"&gt;Portfolio &#x2013; Class I are deleted.&lt;/span&gt;</vip:PortfolioCompaniesN6TextBlock>
    <vip:PortfolioCompaniesN6TextBlock
      contextRef="C000058633"
      id="ixgf8b952a0-6cc3-4b18-bde8-4b60b2917537_4">&lt;span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:12pt;"&gt;All references to Western Asset Management Company Ltd. as a subadviser to the Western Asset Core Plus VIT &lt;/span&gt;&lt;span style="color:#000000;font-family:Arial;font-size:10pt;"&gt;Portfolio &#x2013; Class I are deleted.&lt;/span&gt;</vip:PortfolioCompaniesN6TextBlock>
    <vip:PortfolioCompaniesN6TextBlock
      contextRef="C000034211"
      id="ixgf8b952a0-6cc3-4b18-bde8-4b60b2917537_5">&lt;span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:12pt;"&gt;All references to Western Asset Management Company Ltd. as a subadviser to the Western Asset Core Plus VIT &lt;/span&gt;&lt;span style="color:#000000;font-family:Arial;font-size:10pt;"&gt;Portfolio &#x2013; Class I are deleted.&lt;/span&gt;</vip:PortfolioCompaniesN6TextBlock>
    <vip:PortfolioCompaniesN6TextBlock
      contextRef="C000065290"
      id="ixgf8b952a0-6cc3-4b18-bde8-4b60b2917537_6">&lt;span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:12pt;"&gt;All references to Western Asset Management Company Ltd. as a subadviser to the Western Asset Core Plus VIT &lt;/span&gt;&lt;span style="color:#000000;font-family:Arial;font-size:10pt;"&gt;Portfolio &#x2013; Class I are deleted.&lt;/span&gt;</vip:PortfolioCompaniesN6TextBlock>
</xbrl>
