<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2025"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2025"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2025/ffd-2025.xsd"
      xlink:type="simple"/>
    <context id="c_offering_1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002069821</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-08-28</startDate>
            <endDate>2025-08-28</endDate>
        </period>
    </context>
    <context id="c_offering_2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002069821</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>2</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2025-08-28</startDate>
            <endDate>2025-08-28</endDate>
        </period>
    </context>
    <context id="c_report">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0002069821</identifier>
        </entity>
        <period>
            <startDate>2025-08-28</startDate>
            <endDate>2025-08-28</endDate>
        </period>
    </context>
    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <unit id="shares">
        <measure>shares</measure>
    </unit>
    <ffd:SubmissnTp contextRef="c_report" id="fee_001">F-1</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="c_report" id="fee_002">EX-FILING FEES</ffd:FeeExhibitTp>
    <dei:EntityCentralIndexKey contextRef="c_report" id="fee_003">0002069821</dei:EntityCentralIndexKey>
    <ffd:OfferingTableNa contextRef="c_report" id="fee_004" xsi:nil="true"/>
    <ffd:OffsetTableNa contextRef="c_report" id="fee_005">N/A</ffd:OffsetTableNa>
    <ffd:CombinedProspectusTableNa contextRef="c_report" id="fee_006">N/A</ffd:CombinedProspectusTableNa>
    <ffd:FormTp contextRef="c_report" id="fee_007">F-1</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="c_report" id="fee_008">Billion Group Holdings Limited</dei:EntityRegistrantName>
    <ffd:PrevslyPdFlg contextRef="c_offering_1" id="fee_009">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="c_offering_1" id="fee_010">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="c_offering_1" id="fee_011">Ordinary Shares, par value US$0.0001 per share</ffd:OfferingSctyTitl>
    <ffd:Rule457oFlg contextRef="c_offering_1" id="fee_012">true</ffd:Rule457oFlg>
    <ffd:AmtSctiesRegd
      contextRef="c_offering_1"
      decimals="0"
      id="fee_013"
      unitRef="shares">1600000</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_014"
      unitRef="USD">6.00</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_015"
      unitRef="USD">9600000.00</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_016"
      unitRef="pure">0.0001531</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="c_offering_1"
      decimals="INF"
      id="fee_017"
      unitRef="USD">1469.76</ffd:FeeAmt>
    <ffd:PrevslyPdFlg contextRef="c_offering_2" id="fee_018">false</ffd:PrevslyPdFlg>
    <ffd:OfferingSctyTp contextRef="c_offering_2" id="fee_019">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="c_offering_2" id="fee_020">Ordinary Shares, par value US$0.0001 per share</ffd:OfferingSctyTitl>
    <ffd:Rule457oFlg contextRef="c_offering_2" id="fee_021">true</ffd:Rule457oFlg>
    <ffd:AmtSctiesRegd
      contextRef="c_offering_2"
      decimals="0"
      id="fee_022"
      unitRef="shares">240000</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="c_offering_2"
      decimals="INF"
      id="fee_023"
      unitRef="USD">6.00</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="c_offering_2"
      decimals="INF"
      id="fee_024"
      unitRef="USD">1440000.00</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="c_offering_2"
      decimals="INF"
      id="fee_025"
      unitRef="pure">0.0001531</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="c_offering_2"
      decimals="INF"
      id="fee_026"
      unitRef="USD">220.46</ffd:FeeAmt>
    <ffd:TtlOfferingAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_027"
      unitRef="USD">9600000.00</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_028"
      unitRef="USD">1690.22</ffd:TtlFeeAmt>
    <ffd:TtlOffsetAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_029"
      unitRef="USD">0.00</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt
      contextRef="c_report"
      decimals="INF"
      id="fee_030"
      unitRef="USD">1690.22</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="c_offering_1" id="fee_031">The registration fee for securities is based on an estimate of the Proposed Maximum Aggregate Offering Price of the securities, assuming the sale of the maximum number of shares at the highest expected offering price, and such estimate is solely for the purpose of calculating the registration fee pursuant to Rule 457(o).</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="c_offering_2" id="fee_032">The registration fee for securities is based on an estimate of the Proposed Maximum Aggregate Offering Price of the securities, assuming the sale of the maximum number of shares at the highest expected offering price, and such estimate is solely for the purpose of calculating the registration fee pursuant to Rule 457(o).&lt;br/&gt;&lt;br/&gt;Reflects the additional shares that the underwriter has the option to purchase to cover over-allotments, if any.</ffd:OfferingNote>
</xbrl>
