<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ecd="http://xbrl.sec.gov/ecd/2025"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="cjmb-20251231.xsd" xlink:type="simple"/>
    <context id="From2025-01-01to2025-12-31">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002032545</identifier>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <context id="From2025-01-012025-12-31_2025-12-31">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002032545</identifier>
            <segment>
                <xbrldi:typedMember dimension="ecd:RestatementDateAxis">
                    <ecd:RestatementDateAxis.domain>2025-12-31</ecd:RestatementDateAxis.domain>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-01-01</startDate>
            <endDate>2025-12-31</endDate>
        </period>
    </context>
    <dei:AmendmentFlag contextRef="From2025-01-01to2025-12-31" id="Fact000003">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey contextRef="From2025-01-01to2025-12-31" id="Fact000004">0002032545</dei:EntityCentralIndexKey>
    <dei:DocumentType contextRef="From2025-01-01to2025-12-31" id="xdx2ixbrl0010">PRER14C</dei:DocumentType>
    <dei:EntityRegistrantName contextRef="From2025-01-01to2025-12-31" id="Fact000011">CALLAN JMB INC.</dei:EntityRegistrantName>
    <ecd:ErrCompAnalysisTextBlock
      contextRef="From2025-01-012025-12-31_2025-12-31"
      id="Fact000012">Awards
will be subject to any Company clawback policy that the Company is required to adopt pursuant to the listing standards of any national
securities exchange or association on which the Company&#x2019;s securities are listed or as is otherwise required by the Dodd-Frank Wall
Street Reform and Consumer Protection Act or other applicable laws. The administrator also may specify in an award agreement that the
participant&#x2019;s rights, payments, or benefits with respect to an award will be subject to reduction, cancellation, forfeiture, or
recoupment upon the occurrence of certain specified events. The administrator may require a participant to forfeit, return or reimburse
the Company all or a portion of the award or shares issued under the award, any amounts paid under the award and any payments or proceeds
paid or provided upon disposition of the shares issued under the award in order to comply with such clawback policy or applicable laws.</ecd:ErrCompAnalysisTextBlock>
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