<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.23.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>599</ContextCount>
  <ElementCount>400</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>120</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>6</UnitCount>
  <MyReports>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover Page</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/CoverPage</Role>
      <ShortName>Cover Page</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDCONSOLIDATEDSTATEMENTSOFFINANCIALPOSITION</Role>
      <ShortName>UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATING RESULTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDCONSOLIDATEDSTATEMENTSOFOPERATINGRESULTS</Role>
      <ShortName>UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATING RESULTS</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDCONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS</Role>
      <ShortName>UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDCONSOLIDATEDSTATEMENTSOFCHANGESINEQUITY</Role>
      <ShortName>UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDCONSOLIDATEDSTATEMENTSOFCASHFLOW</Role>
      <ShortName>UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Disclosure - NATURE AND DESCRIPTION OF THE PARTNERSHIP</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/NATUREANDDESCRIPTIONOFTHEPARTNERSHIP</Role>
      <ShortName>NATURE AND DESCRIPTION OF THE PARTNERSHIP</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Disclosure - MATERIAL ACCOUNTING POLICY INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/MATERIALACCOUNTINGPOLICYINFORMATION</Role>
      <ShortName>MATERIAL ACCOUNTING POLICY INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Disclosure - ACQUISITION OF BUSINESSES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACQUISITIONOFBUSINESSES</Role>
      <ShortName>ACQUISITION OF BUSINESSES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Disclosure - FINANCIAL ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FINANCIALASSETS</Role>
      <ShortName>FINANCIAL ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Disclosure - ACCOUNTS AND OTHER RECEIVABLE, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCOUNTSANDOTHERRECEIVABLENET</Role>
      <ShortName>ACCOUNTS AND OTHER RECEIVABLE, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0000013 - Disclosure - INVENTORY, NET</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INVENTORYNET</Role>
      <ShortName>INVENTORY, NET</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0000014 - Disclosure - DISPOSITIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/DISPOSITIONS</Role>
      <ShortName>DISPOSITIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0000015 - Disclosure - OTHER ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/OTHERASSETS</Role>
      <ShortName>OTHER ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0000016 - Disclosure - PROPERTY, PLANT AND EQUIPMENT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/PROPERTYPLANTANDEQUIPMENT</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0000017 - Disclosure - INTANGIBLE ASSETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INTANGIBLEASSETS</Role>
      <ShortName>INTANGIBLE ASSETS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0000018 - Disclosure - GOODWILL</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/GOODWILL</Role>
      <ShortName>GOODWILL</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0000019 - Disclosure - EQUITY ACCOUNTED INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYACCOUNTEDINVESTMENTS</Role>
      <ShortName>EQUITY ACCOUNTED INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0000020 - Disclosure - ACCOUNTS PAYABLE AND OTHER</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCOUNTSPAYABLEANDOTHER</Role>
      <ShortName>ACCOUNTS PAYABLE AND OTHER</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0000021 - Disclosure - CONTRACTS IN PROGRESS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/CONTRACTSINPROGRESS</Role>
      <ShortName>CONTRACTS IN PROGRESS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0000022 - Disclosure - BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/BORROWINGS</Role>
      <ShortName>BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0000023 - Disclosure - RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/RELATEDPARTYTRANSACTIONS</Role>
      <ShortName>RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>0000024 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/DERIVATIVEFINANCIALINSTRUMENTS</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>0000025 - Disclosure - EQUITY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITY</Role>
      <ShortName>EQUITY</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>0000026 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>0000027 - Disclosure - DIRECT OPERATING COSTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/DIRECTOPERATINGCOSTS</Role>
      <ShortName>DIRECT OPERATING COSTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>0000028 - Disclosure - REVENUES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/REVENUES</Role>
      <ShortName>REVENUES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>0000029 - Disclosure - SEGMENT INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SEGMENTINFORMATION</Role>
      <ShortName>SEGMENT INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>0000030 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SUPPLEMENTALCASHFLOWINFORMATION</Role>
      <ShortName>SUPPLEMENTAL CASH FLOW INFORMATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>0000031 - Disclosure - INSURANCE CONTRACTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INSURANCECONTRACTS</Role>
      <ShortName>INSURANCE CONTRACTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>0000032 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SUBSEQUENTEVENTS</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>0000033 - Disclosure - MATERIAL ACCOUNTING POLICY INFORMATION (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/MATERIALACCOUNTINGPOLICYINFORMATIONPolicies</Role>
      <ShortName>MATERIAL ACCOUNTING POLICY INFORMATION (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>0000034 - Disclosure - ACQUISITION OF BUSINESSES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACQUISITIONOFBUSINESSESTables</Role>
      <ShortName>ACQUISITION OF BUSINESSES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/ACQUISITIONOFBUSINESSES</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>0000035 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSTables</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTS</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>0000036 - Disclosure - FINANCIAL ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FINANCIALASSETSTables</Role>
      <ShortName>FINANCIAL ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/FINANCIALASSETS</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>0000037 - Disclosure - ACCOUNTS AND OTHER RECEIVABLE, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCOUNTSANDOTHERRECEIVABLENETTables</Role>
      <ShortName>ACCOUNTS AND OTHER RECEIVABLE, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/ACCOUNTSANDOTHERRECEIVABLENET</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>0000038 - Disclosure - INVENTORY, NET (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INVENTORYNETTables</Role>
      <ShortName>INVENTORY, NET (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/INVENTORYNET</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>0000039 - Disclosure - OTHER ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/OTHERASSETSTables</Role>
      <ShortName>OTHER ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/OTHERASSETS</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>0000040 - Disclosure - PROPERTY, PLANT AND EQUIPMENT (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/PROPERTYPLANTANDEQUIPMENTTables</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/PROPERTYPLANTANDEQUIPMENT</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>0000041 - Disclosure - INTANGIBLE ASSETS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INTANGIBLEASSETSTables</Role>
      <ShortName>INTANGIBLE ASSETS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/INTANGIBLEASSETS</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>0000042 - Disclosure - GOODWILL (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/GOODWILLTables</Role>
      <ShortName>GOODWILL (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/GOODWILL</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>0000043 - Disclosure - EQUITY ACCOUNTED INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYACCOUNTEDINVESTMENTSTables</Role>
      <ShortName>EQUITY ACCOUNTED INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/EQUITYACCOUNTEDINVESTMENTS</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>0000044 - Disclosure - ACCOUNTS PAYABLE AND OTHER (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCOUNTSPAYABLEANDOTHERTables</Role>
      <ShortName>ACCOUNTS PAYABLE AND OTHER (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/ACCOUNTSPAYABLEANDOTHER</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>0000045 - Disclosure - CONTRACTS IN PROGRESS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/CONTRACTSINPROGRESSTables</Role>
      <ShortName>CONTRACTS IN PROGRESS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/CONTRACTSINPROGRESS</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>0000046 - Disclosure - RELATED PARTY TRANSACTIONS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/RELATEDPARTYTRANSACTIONSTables</Role>
      <ShortName>RELATED PARTY TRANSACTIONS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/RELATEDPARTYTRANSACTIONS</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>0000047 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/DERIVATIVEFINANCIALINSTRUMENTSTables</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/DERIVATIVEFINANCIALINSTRUMENTS</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>0000048 - Disclosure - EQUITY (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYTables</Role>
      <ShortName>EQUITY (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/EQUITYACCOUNTEDINVESTMENTS</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>0000049 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS</ParentRole>
      <Position>49</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>0000050 - Disclosure - DIRECT OPERATING COSTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/DIRECTOPERATINGCOSTSTables</Role>
      <ShortName>DIRECT OPERATING COSTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/DIRECTOPERATINGCOSTS</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>0000051 - Disclosure - REVENUES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/REVENUESTables</Role>
      <ShortName>REVENUES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/REVENUES</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>0000052 - Disclosure - SEGMENT INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SEGMENTINFORMATIONTables</Role>
      <ShortName>SEGMENT INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/SEGMENTINFORMATION</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>0000053 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SUPPLEMENTALCASHFLOWINFORMATIONTables</Role>
      <ShortName>SUPPLEMENTAL CASH FLOW INFORMATION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/SUPPLEMENTALCASHFLOWINFORMATION</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>0000054 - Disclosure - INSURANCE CONTRACTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INSURANCECONTRACTSTables</Role>
      <ShortName>INSURANCE CONTRACTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/INSURANCECONTRACTS</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>0000055 - Disclosure - NATURE AND DESCRIPTION OF THE PARTNERSHIP - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/NATUREANDDESCRIPTIONOFTHEPARTNERSHIPNarrativeDetails</Role>
      <ShortName>NATURE AND DESCRIPTION OF THE PARTNERSHIP - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>0000056 - Disclosure - MATERIAL ACCOUNTING POLICY INFORMATION - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/MATERIALACCOUNTINGPOLICYINFORMATIONNarrativeDetails</Role>
      <ShortName>MATERIAL ACCOUNTING POLICY INFORMATION - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>0000057 - Disclosure - ACQUISITION OF BUSINESSES - Acquisition Completed in 2023 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACQUISITIONOFBUSINESSESAcquisitionCompletedin2023Details</Role>
      <ShortName>ACQUISITION OF BUSINESSES - Acquisition Completed in 2023 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>0000058 - Disclosure - ACQUISITION OF BUSINESSES - Schedule of Acquisitions Completed in 2022 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACQUISITIONOFBUSINESSESScheduleofAcquisitionsCompletedin2022Details</Role>
      <ShortName>ACQUISITION OF BUSINESSES - Schedule of Acquisitions Completed in 2022 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>0000059 - Disclosure - ACQUISITION OF BUSINESSES - Business Service (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACQUISITIONOFBUSINESSESBusinessServiceDetails</Role>
      <ShortName>ACQUISITION OF BUSINESSES - Business Service (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>0000060 - Disclosure - ACQUISITION OF BUSINESSES - Infrastructure Services (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACQUISITIONOFBUSINESSESInfrastructureServicesDetails</Role>
      <ShortName>ACQUISITION OF BUSINESSES - Infrastructure Services (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>0000061 - Disclosure - ACQUISITION OF BUSINESSES - Industrials Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACQUISITIONOFBUSINESSESIndustrialsSegmentDetails</Role>
      <ShortName>ACQUISITION OF BUSINESSES - Industrials Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>0000062 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Financial Instruments Classification (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSFinancialInstrumentsClassificationDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Financial Instruments Classification (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>0000063 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSAdditionalInformationDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>0000064 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Hierarchy Levels (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSFairValueHierarchyLevelsDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Hierarchy Levels (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>0000065 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Change in Balance of Financial Assets Classified as Level 3 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSChangeinBalanceofFinancialAssetsClassifiedasLevel3Details</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Change in Balance of Financial Assets Classified as Level 3 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>0000066 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Change in Balance of Fair Value Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSChangeinBalanceofFairValueLiabilitiesDetails</Role>
      <ShortName>FAIR VALUE OF FINANCIAL INSTRUMENTS - Change in Balance of Fair Value Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>0000067 - Disclosure - FINANCIAL ASSETS - Disclosure of Financial Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/FINANCIALASSETSDisclosureofFinancialAssetsDetails</Role>
      <ShortName>FINANCIAL ASSETS - Disclosure of Financial Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>0000068 - Disclosure - ACCOUNTS AND OTHER RECEIVABLE, NET - Current and Non-current Balances (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCOUNTSANDOTHERRECEIVABLENETCurrentandNoncurrentBalancesDetails</Role>
      <ShortName>ACCOUNTS AND OTHER RECEIVABLE, NET - Current and Non-current Balances (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>0000069 - Disclosure - ACCOUNTS AND OTHER RECEIVABLE, NET - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCOUNTSANDOTHERRECEIVABLENETNarrativeDetails</Role>
      <ShortName>ACCOUNTS AND OTHER RECEIVABLE, NET - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>0000070 - Disclosure - INVENTORY, NET - Disclosure of Current Inventories (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INVENTORYNETDisclosureofCurrentInventoriesDetails</Role>
      <ShortName>INVENTORY, NET - Disclosure of Current Inventories (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>0000071 - Disclosure - DISPOSITIONS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/DISPOSITIONSDetails</Role>
      <ShortName>DISPOSITIONS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/DISPOSITIONS</ParentRole>
      <Position>71</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>0000072 - Disclosure - OTHER ASSETS - Disclosure of Other Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/OTHERASSETSDisclosureofOtherAssetsDetails</Role>
      <ShortName>OTHER ASSETS - Disclosure of Other Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>0000073 - Disclosure - PROPERTY, PLANT AND EQUIPMENT - Disclosure of Property, Plant and Equipment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/PROPERTYPLANTANDEQUIPMENTDisclosureofPropertyPlantandEquipmentDetails</Role>
      <ShortName>PROPERTY, PLANT AND EQUIPMENT - Disclosure of Property, Plant and Equipment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>0000074 - Disclosure - INTANGIBLE ASSETS - Disclosure of Changes in Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INTANGIBLEASSETSDisclosureofChangesinIntangibleAssetsDetails</Role>
      <ShortName>INTANGIBLE ASSETS - Disclosure of Changes in Intangible Assets (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>0000075 - Disclosure - GOODWILL - Disclosure of Changes in Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/GOODWILLDisclosureofChangesinGoodwillDetails</Role>
      <ShortName>GOODWILL - Disclosure of Changes in Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>0000076 - Disclosure - EQUITY ACCOUNTED INVESTMENTS - Change in Equity Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYACCOUNTEDINVESTMENTSChangeinEquityInvestmentsDetails</Role>
      <ShortName>EQUITY ACCOUNTED INVESTMENTS - Change in Equity Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>0000077 - Disclosure - ACCOUNTS PAYABLE AND OTHER - Accounts Payable and Other (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCOUNTSPAYABLEANDOTHERAccountsPayableandOtherDetails</Role>
      <ShortName>ACCOUNTS PAYABLE AND OTHER - Accounts Payable and Other (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>0000078 - Disclosure - CONTRACTS IN PROGRESS - Disclosure of Contracts in Progress (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/CONTRACTSINPROGRESSDisclosureofContractsinProgressDetails</Role>
      <ShortName>CONTRACTS IN PROGRESS - Disclosure of Contracts in Progress (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>0000079 - Disclosure - BORROWINGS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/BORROWINGSDetails</Role>
      <ShortName>BORROWINGS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/BORROWINGS</ParentRole>
      <Position>79</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>0000080 - Disclosure - RELATED PARTY TRANSACTIONS - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/RELATEDPARTYTRANSACTIONSAdditionalInformationDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>0000081 - Disclosure - RELATED PARTY TRANSACTIONS - Other Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/RELATEDPARTYTRANSACTIONSOtherRelatedPartyTransactionsDetails</Role>
      <ShortName>RELATED PARTY TRANSACTIONS - Other Related Party Transactions (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>0000082 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS - Disclosure of Derivative Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/DERIVATIVEFINANCIALINSTRUMENTSDisclosureofDerivativeFinancialInstrumentsDetails</Role>
      <ShortName>DERIVATIVE FINANCIAL INSTRUMENTS - Disclosure of Derivative Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>82</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>0000083 - Disclosure - EQUITY - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYAdditionalInformationDetails</Role>
      <ShortName>EQUITY - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>0000084 - Disclosure - EQUITY - General and Limited Partnership Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYGeneralandLimitedPartnershipUnitsDetails</Role>
      <ShortName>EQUITY - General and Limited Partnership Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>0000085 - Disclosure - EQUITY - Redemption-Exchange Units Held by Brookfield (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYRedemptionExchangeUnitsHeldbyBrookfieldDetails</Role>
      <ShortName>EQUITY - Redemption-Exchange Units Held by Brookfield (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>0000086 - Disclosure - EQUITY - BBUC Exchangeable Shares (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYBBUCExchangeableSharesDetails</Role>
      <ShortName>EQUITY - BBUC Exchangeable Shares (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>0000087 - Disclosure - EQUITY - Special Limited Partner Units Held by Brookfield (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYSpecialLimitedPartnerUnitsHeldbyBrookfieldDetails</Role>
      <ShortName>EQUITY - Special Limited Partner Units Held by Brookfield (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>0000088 - Disclosure - EQUITY - Preferred Securities Held by Brookfield (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/EQUITYPreferredSecuritiesHeldbyBrookfieldDetails</Role>
      <ShortName>EQUITY - Preferred Securities Held by Brookfield (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>0000089 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Disclosure of Accumulated Other Comprehensive Income (Loss) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDisclosureofAccumulatedOtherComprehensiveIncomeLossDetails</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Disclosure of Accumulated Other Comprehensive Income (Loss) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://bbu.brookfield.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSTables</ParentRole>
      <Position>89</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>0000090 - Disclosure - DIRECT OPERATING COSTS - Schedule of Lists of Direct Costs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/DIRECTOPERATINGCOSTSScheduleofListsofDirectCostsDetails</Role>
      <ShortName>DIRECT OPERATING COSTS - Schedule of Lists of Direct Costs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>0000091 - Disclosure - REVENUES - Revenues by Type (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/REVENUESRevenuesbyTypeDetails</Role>
      <ShortName>REVENUES - Revenues by Type (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>0000092 - Disclosure - REVENUES - Timing of Revenues Recognition From Contracts with Customers (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/REVENUESTimingofRevenuesRecognitionFromContractswithCustomersDetails</Role>
      <ShortName>REVENUES - Timing of Revenues Recognition From Contracts with Customers (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>0000093 - Disclosure - REVENUES - Revenues by Geography (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/REVENUESRevenuesbyGeographyDetails</Role>
      <ShortName>REVENUES - Revenues by Geography (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>0000094 - Disclosure - SEGMENT INFORMATION - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SEGMENTINFORMATIONAdditionalInformationDetails</Role>
      <ShortName>SEGMENT INFORMATION - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>94</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>0000095 - Disclosure - SEGMENT INFORMATION - Income Statement Captions by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SEGMENTINFORMATIONIncomeStatementCaptionsbySegmentDetails</Role>
      <ShortName>SEGMENT INFORMATION - Income Statement Captions by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>95</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>0000096 - Disclosure - SEGMENT INFORMATION - Assets by Segment (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SEGMENTINFORMATIONAssetsbySegmentDetails</Role>
      <ShortName>SEGMENT INFORMATION - Assets by Segment (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>96</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>0000097 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Interest and Income Taxes Paid (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SUPPLEMENTALCASHFLOWINFORMATIONInterestandIncomeTaxesPaidDetails</Role>
      <ShortName>SUPPLEMENTAL CASH FLOW INFORMATION - Interest and Income Taxes Paid (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>97</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>0000098 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Working Capital (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SUPPLEMENTALCASHFLOWINFORMATIONNoncashWorkingCapitalDetails</Role>
      <ShortName>SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Working Capital (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>98</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>0000099 - Disclosure - INSURANCE CONTRACTS - Schedule of Insurance under Contract (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/INSURANCECONTRACTSScheduleofInsuranceunderContractDetails</Role>
      <ShortName>INSURANCE CONTRACTS - Schedule of Insurance under Contract (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="bbu-20230630.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>0000100 - Disclosure - SUBSEQUENT EVENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://bbu.brookfield.com/role/SUBSEQUENTEVENTSNarrativeDetails</Role>
      <ShortName>SUBSEQUENT EVENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</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="6-K" original="bbu-20230630.htm">bbu-20230630.htm</File>
    <File doctype="6-K" original="bbu-20230630_d2.htm">bbu-20230630_d2.htm</File>
    <File>bbu-20230630.xsd</File>
    <File>bbu-20230630_cal.xml</File>
    <File>bbu-20230630_def.xml</File>
    <File>bbu-20230630_lab.xml</File>
    <File>bbu-20230630_pre.xml</File>
    <File>bbuq22023ex992.htm</File>
    <File>bbuq22023ex993.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="28">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="8">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
    <BaseTaxonomy items="1534">https://xbrl.ifrs.org/taxonomy/2023-03-23/ifrs-full</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
