3.10.0.1 html 546 324 1 true 102 0 false 9 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://bbu.brookfield.com/role/DocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 1001000 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION Sheet http://bbu.brookfield.com/role/UnauditedInterimCondensedConsolidatedStatementsOfFinancialPosition UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL POSITION Statements 2 false false R3.htm 1002000 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATING RESULTS Sheet http://bbu.brookfield.com/role/UnauditedInterimCondensedConsolidatedStatementsOfOperatingResults UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF OPERATING RESULTS Statements 3 false false R4.htm 1004000 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Sheet http://bbu.brookfield.com/role/UnauditedInterimCondensedConsolidatedStatementsOfComprehensiveIncomeLoss UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) Statements 4 false false R5.htm 1006000 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Sheet http://bbu.brookfield.com/role/UnauditedInterimCondensedConsolidatedStatementsOfChangesInEquity UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY Statements 5 false false R6.htm 1007000 - Statement - UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW Sheet http://bbu.brookfield.com/role/UnauditedInterimCondensedConsolidatedStatementsOfCashFlow UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW Statements 6 false false R7.htm 2101100 - Disclosure - NATURE AND DESCRIPTION OF THE PARTNERSHIP Sheet http://bbu.brookfield.com/role/NatureAndDescriptionOfPartnership NATURE AND DESCRIPTION OF THE PARTNERSHIP Notes 7 false false R8.htm 2102100 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES Sheet http://bbu.brookfield.com/role/SignificantAccountingPolicies SIGNIFICANT ACCOUNTING POLICIES Notes 8 false false R9.htm 2103100 - Disclosure - ACQUISITION OF BUSINESSES Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinesses ACQUISITION OF BUSINESSES Notes 9 false false R10.htm 2104100 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS Sheet http://bbu.brookfield.com/role/FairValueOfFinancialInstruments FAIR VALUE OF FINANCIAL INSTRUMENTS Notes 10 false false R11.htm 2105100 - Disclosure - FINANCIAL ASSETS Sheet http://bbu.brookfield.com/role/FinancialAssets FINANCIAL ASSETS Notes 11 false false R12.htm 2106100 - Disclosure - ACCOUNTS AND OTHER RECEIVABLE, NET Sheet http://bbu.brookfield.com/role/AccountsAndOtherReceivableNet ACCOUNTS AND OTHER RECEIVABLE, NET Notes 12 false false R13.htm 2107100 - Disclosure - INVENTORY, NET Sheet http://bbu.brookfield.com/role/InventoryNet INVENTORY, NET Notes 13 false false R14.htm 2108100 - Disclosure - ASSETS HELD FOR SALE Sheet http://bbu.brookfield.com/role/AssetsHeldForSale ASSETS HELD FOR SALE Notes 14 false false R15.htm 2109100 - Disclosure - OTHER ASSETS Sheet http://bbu.brookfield.com/role/OtherAssets OTHER ASSETS Notes 15 false false R16.htm 2110100 - Disclosure - EQUITY ACCOUNTED INVESTMENTS Sheet http://bbu.brookfield.com/role/EquityAccountedInvestments EQUITY ACCOUNTED INVESTMENTS Notes 16 false false R17.htm 2111100 - Disclosure - ACCOUNTS PAYABLE AND OTHER Sheet http://bbu.brookfield.com/role/AccountsPayableAndOther ACCOUNTS PAYABLE AND OTHER Notes 17 false false R18.htm 2112100 - Disclosure - CONTRACTS IN PROGRESS Sheet http://bbu.brookfield.com/role/ContractsInProgress CONTRACTS IN PROGRESS Notes 18 false false R19.htm 2113100 - Disclosure - BORROWINGS Sheet http://bbu.brookfield.com/role/Borrowings BORROWINGS Notes 19 false false R20.htm 2114100 - Disclosure - RELATED PARTY TRANSACTIONS Sheet http://bbu.brookfield.com/role/RelatedPartyTransactions RELATED PARTY TRANSACTIONS Notes 20 false false R21.htm 2115100 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS Sheet http://bbu.brookfield.com/role/DerivativeFinancialInstruments DERIVATIVE FINANCIAL INSTRUMENTS Notes 21 false false R22.htm 2116100 - Disclosure - EQUITY Sheet http://bbu.brookfield.com/role/Equity EQUITY Notes 22 false false R23.htm 2117100 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Sheet http://bbu.brookfield.com/role/AccumulatedOtherComprehensiveIncomeLoss ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Notes 23 false false R24.htm 2118100 - Disclosure - DIRECT OPERATING COSTS Sheet http://bbu.brookfield.com/role/DirectOperatingCosts DIRECT OPERATING COSTS Notes 24 false false R25.htm 2119100 - Disclosure - SEGMENT INFORMATION Sheet http://bbu.brookfield.com/role/SegmentInformation SEGMENT INFORMATION Notes 25 false false R26.htm 2120100 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION Sheet http://bbu.brookfield.com/role/SupplementalCashFlowInformation SUPPLEMENTAL CASH FLOW INFORMATION Notes 26 false false R27.htm 2121100 - Disclosure - SUBSEQUENT EVENTS Sheet http://bbu.brookfield.com/role/SubsequentEvents SUBSEQUENT EVENTS Notes 27 false false R28.htm 2202201 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) Sheet http://bbu.brookfield.com/role/SignificantAccountingPoliciesPolicies SIGNIFICANT ACCOUNTING POLICIES (Policies) Policies 28 false false R29.htm 2302303 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Tables) Sheet http://bbu.brookfield.com/role/SignificantAccountingPoliciesTables SIGNIFICANT ACCOUNTING POLICIES (Tables) Tables http://bbu.brookfield.com/role/SignificantAccountingPolicies 29 false false R30.htm 2303301 - Disclosure - ACQUISITION OF BUSINESSES (Tables) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesTables ACQUISITION OF BUSINESSES (Tables) Tables http://bbu.brookfield.com/role/AcquisitionOfBusinesses 30 false false R31.htm 2304301 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) Sheet http://bbu.brookfield.com/role/FairValueOfFinancialInstrumentsTables FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) Tables http://bbu.brookfield.com/role/FairValueOfFinancialInstruments 31 false false R32.htm 2305301 - Disclosure - FINANCIAL ASSETS (Tables) Sheet http://bbu.brookfield.com/role/FinancialAssetsTables FINANCIAL ASSETS (Tables) Tables http://bbu.brookfield.com/role/FinancialAssets 32 false false R33.htm 2306301 - Disclosure - ACCOUNTS AND OTHER RECEIVABLE, NET (Tables) Sheet http://bbu.brookfield.com/role/AccountsAndOtherReceivableNetTables ACCOUNTS AND OTHER RECEIVABLE, NET (Tables) Tables http://bbu.brookfield.com/role/AccountsAndOtherReceivableNet 33 false false R34.htm 2307301 - Disclosure - INVENTORY, NET (Tables) Sheet http://bbu.brookfield.com/role/InventoryNetTables INVENTORY, NET (Tables) Tables http://bbu.brookfield.com/role/InventoryNet 34 false false R35.htm 2308301 - Disclosure - ASSETS HELD FOR SALE (Tables) Sheet http://bbu.brookfield.com/role/AssetsHeldForSaleTables ASSETS HELD FOR SALE (Tables) Tables http://bbu.brookfield.com/role/AssetsHeldForSale 35 false false R36.htm 2309301 - Disclosure - OTHER ASSETS (Tables) Sheet http://bbu.brookfield.com/role/OtherAssetsTables OTHER ASSETS (Tables) Tables http://bbu.brookfield.com/role/OtherAssets 36 false false R37.htm 2310301 - Disclosure - EQUITY ACCOUNTED INVESTMENTS (Tables) Sheet http://bbu.brookfield.com/role/EquityAccountedInvestmentsTables EQUITY ACCOUNTED INVESTMENTS (Tables) Tables http://bbu.brookfield.com/role/EquityAccountedInvestments 37 false false R38.htm 2311301 - Disclosure - ACCOUNTS PAYABLE AND OTHER (Tables) Sheet http://bbu.brookfield.com/role/AccountsPayableAndOtherTables ACCOUNTS PAYABLE AND OTHER (Tables) Tables http://bbu.brookfield.com/role/AccountsPayableAndOther 38 false false R39.htm 2312301 - Disclosure - CONTRACTS IN PROGRESS (Tables) Sheet http://bbu.brookfield.com/role/ContractsInProgressTables CONTRACTS IN PROGRESS (Tables) Tables http://bbu.brookfield.com/role/ContractsInProgress 39 false false R40.htm 2314301 - Disclosure - RELATED PARTY TRANSACTIONS (Tables) Sheet http://bbu.brookfield.com/role/RelatedPartyTransactionsTables RELATED PARTY TRANSACTIONS (Tables) Tables http://bbu.brookfield.com/role/RelatedPartyTransactions 40 false false R41.htm 2315301 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS (Tables) Sheet http://bbu.brookfield.com/role/DerivativeFinancialInstrumentsTables DERIVATIVE FINANCIAL INSTRUMENTS (Tables) Tables http://bbu.brookfield.com/role/DerivativeFinancialInstruments 41 false false R42.htm 2317301 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) Sheet http://bbu.brookfield.com/role/AccumulatedOtherComprehensiveIncomeLossTables ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) Tables http://bbu.brookfield.com/role/AccumulatedOtherComprehensiveIncomeLoss 42 false false R43.htm 2318301 - Disclosure - DIRECT OPERATING COSTS (Tables) Sheet http://bbu.brookfield.com/role/DirectOperatingCostsTables DIRECT OPERATING COSTS (Tables) Tables http://bbu.brookfield.com/role/DirectOperatingCosts 43 false false R44.htm 2319301 - Disclosure - SEGMENT INFORMATION (Tables) Sheet http://bbu.brookfield.com/role/SegmentInformationTables SEGMENT INFORMATION (Tables) Tables http://bbu.brookfield.com/role/SegmentInformation 44 false false R45.htm 2320301 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION (Tables) Sheet http://bbu.brookfield.com/role/SupplementalCashFlowInformationTables SUPPLEMENTAL CASH FLOW INFORMATION (Tables) Tables http://bbu.brookfield.com/role/SupplementalCashFlowInformation 45 false false R46.htm 2402404 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) Sheet http://bbu.brookfield.com/role/SignificantAccountingPoliciesNarrativeDetails SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) Details 46 false false R47.htm 2402405 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact on Adoption of New IFRS Standards (Details) Sheet http://bbu.brookfield.com/role/SignificantAccountingPoliciesScheduleOfImpactOnAdoptionOfNewIfrsStandardsDetails SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact on Adoption of New IFRS Standards (Details) Details 47 false false R48.htm 2402406 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Schedules of Segment Revenue by Geography, and Timing of Revenue Recognition for IFRS 15 (Details) Sheet http://bbu.brookfield.com/role/SignificantAccountingPoliciesSchedulesOfSegmentRevenueByGeographyAndTimingOfRevenueRecognitionForIfrs15Details SIGNIFICANT ACCOUNTING POLICIES - Schedules of Segment Revenue by Geography, and Timing of Revenue Recognition for IFRS 15 (Details) Details 48 false false R49.htm 2402407 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact Upon Adoption of IFRS 9 (Details) Sheet http://bbu.brookfield.com/role/SignificantAccountingPoliciesScheduleOfImpactUponAdoptionOfIfrs9Details SIGNIFICANT ACCOUNTING POLICIES - Schedule of Impact Upon Adoption of IFRS 9 (Details) Details 49 false false R50.htm 2403402 - Disclosure - ACQUISITION OF BUSINESSES - Acquisitions Completed in the Current Year (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesAcquisitionsCompletedInCurrentYearDetails ACQUISITION OF BUSINESSES - Acquisitions Completed in the Current Year (Details) Details 50 false false R51.htm 2403403 - Disclosure - ACQUISITION OF BUSINESSES - Business Services, Facilities Management Business ("BGIS") (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesBusinessServicesFacilitiesManagementBusinessBgisDetails ACQUISITION OF BUSINESSES - Business Services, Facilities Management Business ("BGIS") (Details) Details 51 false false R52.htm 2403404 - Disclosure - ACQUISITION OF BUSINESSES - Schoeller Allibert Group B.V ("Schoeller Allibert") (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesSchoellerAllibertGroupBVSchoellerAllibertDetails ACQUISITION OF BUSINESSES - Schoeller Allibert Group B.V ("Schoeller Allibert") (Details) Details 52 false false R53.htm 2403405 - Disclosure - ACQUISITION OF BUSINESSES - Acquisitions completed in 2017 (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesAcquisitionsCompletedIn2017Details ACQUISITION OF BUSINESSES - Acquisitions completed in 2017 (Details) Details 53 false false R54.htm 2403406 - Disclosure - ACQUISITION OF BUSINESSES - Business Services, Fuel Holdings Limited ("Greenergy") (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesBusinessServicesFuelHoldingsLimitedGreenergyDetails ACQUISITION OF BUSINESSES - Business Services, Fuel Holdings Limited ("Greenergy") (Details) Details 54 false false R55.htm 2403407 - Disclosure - ACQUISITION OF BUSINESSES - Business Services, Fuel Marketing (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesBusinessServicesFuelMarketingDetails ACQUISITION OF BUSINESSES - Business Services, Fuel Marketing (Details) Details 55 false false R56.htm 2403408 - Disclosure - ACQUISITION OF BUSINESSES - Business Services, Other (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesBusinessServicesOtherDetails ACQUISITION OF BUSINESSES - Business Services, Other (Details) Details 56 false false R57.htm 2403409 - Disclosure - ACQUISITION OF BUSINESSES - Industrial Operations, BRK Abiental (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesIndustrialOperationsBrkAbientalDetails ACQUISITION OF BUSINESSES - Industrial Operations, BRK Abiental (Details) Details 57 false false R58.htm 2403410 - Disclosure - ACQUISITION OF BUSINESSES - Energy (Details) Sheet http://bbu.brookfield.com/role/AcquisitionOfBusinessesEnergyDetails ACQUISITION OF BUSINESSES - Energy (Details) Details 58 false false R59.htm 2404402 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Financial Instrument Classification (Details) Sheet http://bbu.brookfield.com/role/FairValueOfFinancialInstrumentsFinancialInstrumentClassificationDetails FAIR VALUE OF FINANCIAL INSTRUMENTS - Financial Instrument Classification (Details) Details 59 false false R60.htm 2404403 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) Sheet http://bbu.brookfield.com/role/FairValueOfFinancialInstrumentsNarrativeDetails FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) Details 60 false false R61.htm 2404404 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Hierarchy Levels (Details) Sheet http://bbu.brookfield.com/role/FairValueOfFinancialInstrumentsFairValueHierarchyLevelsDetails FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value Hierarchy Levels (Details) Details 61 false false R62.htm 2404405 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Change in Balance of Fair Value Assets and Liabilities (Details) Sheet http://bbu.brookfield.com/role/FairValueOfFinancialInstrumentsChangeInBalanceOfFairValueAssetsAndLiabilitiesDetails FAIR VALUE OF FINANCIAL INSTRUMENTS - Change in Balance of Fair Value Assets and Liabilities (Details) Details 62 false false R63.htm 2405402 - Disclosure - FINANCIAL ASSETS (Details) Sheet http://bbu.brookfield.com/role/FinancialAssetsDetails FINANCIAL ASSETS (Details) Details http://bbu.brookfield.com/role/FinancialAssetsTables 63 false false R64.htm 2406402 - Disclosure - ACCOUNTS AND OTHER RECEIVABLE, NET - Current and Non-current Balances (Details) Sheet http://bbu.brookfield.com/role/AccountsAndOtherReceivableNetCurrentAndNonCurrentBalancesDetails ACCOUNTS AND OTHER RECEIVABLE, NET - Current and Non-current Balances (Details) Details 64 false false R65.htm 2407402 - Disclosure - INVENTORY, NET (Details) Sheet http://bbu.brookfield.com/role/InventoryNetDetails INVENTORY, NET (Details) Details http://bbu.brookfield.com/role/InventoryNetTables 65 false false R66.htm 2408402 - Disclosure - ASSETS HELD FOR SALE - Assets and Liabilities Classified as Held for Sale (Details) Sheet http://bbu.brookfield.com/role/AssetsHeldForSaleAssetsAndLiabilitiesClassifiedAsHeldForSaleDetails ASSETS HELD FOR SALE - Assets and Liabilities Classified as Held for Sale (Details) Details 66 false false R67.htm 2408403 - Disclosure - ASSETS HELD FOR SALE - Narrative (Details) Sheet http://bbu.brookfield.com/role/AssetsHeldForSaleNarrativeDetails ASSETS HELD FOR SALE - Narrative (Details) Details 67 false false R68.htm 2409402 - Disclosure - OTHER ASSETS (Details) Sheet http://bbu.brookfield.com/role/OtherAssetsDetails OTHER ASSETS (Details) Details http://bbu.brookfield.com/role/OtherAssetsTables 68 false false R69.htm 2410402 - Disclosure - EQUITY ACCOUNTED INVESTMENTS - Change in Investments (Details) Sheet http://bbu.brookfield.com/role/EquityAccountedInvestmentsChangeInInvestmentsDetails EQUITY ACCOUNTED INVESTMENTS - Change in Investments (Details) Details 69 false false R70.htm 2410403 - Disclosure - EQUITY ACCOUNTED INVESTMENTS - Narrative (Details) Sheet http://bbu.brookfield.com/role/EquityAccountedInvestmentsNarrativeDetails EQUITY ACCOUNTED INVESTMENTS - Narrative (Details) Details 70 false false R71.htm 2411402 - Disclosure - ACCOUNTS PAYABLE AND OTHER - Accounts Payable and Other (Details) Sheet http://bbu.brookfield.com/role/AccountsPayableAndOtherAccountsPayableAndOtherDetails ACCOUNTS PAYABLE AND OTHER - Accounts Payable and Other (Details) Details 71 false false R72.htm 2412402 - Disclosure - CONTRACTS IN PROGRESS (Details) Sheet http://bbu.brookfield.com/role/ContractsInProgressDetails CONTRACTS IN PROGRESS (Details) Details http://bbu.brookfield.com/role/ContractsInProgressTables 72 false false R73.htm 2413401 - Disclosure - BORROWINGS (Details) Sheet http://bbu.brookfield.com/role/BorrowingsDetails BORROWINGS (Details) Details http://bbu.brookfield.com/role/Borrowings 73 false false R74.htm 2414402 - Disclosure - RELATED PARTY TRANSACTIONS - Narrative (Details) Sheet http://bbu.brookfield.com/role/RelatedPartyTransactionsNarrativeDetails RELATED PARTY TRANSACTIONS - Narrative (Details) Details 74 false false R75.htm 2414403 - Disclosure - RELATED PARTY TRANSACTIONS - Other Related Party Transactions (Details) Sheet http://bbu.brookfield.com/role/RelatedPartyTransactionsOtherRelatedPartyTransactionsDetails RELATED PARTY TRANSACTIONS - Other Related Party Transactions (Details) Details 75 false false R76.htm 2415402 - Disclosure - DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Positions (Details) Sheet http://bbu.brookfield.com/role/DerivativeFinancialInstrumentsNotionalAmountOfDerivativePositionsDetails DERIVATIVE FINANCIAL INSTRUMENTS - Notional Amount of Derivative Positions (Details) Details 76 false false R77.htm 2416402 - Disclosure - EQUITY (Details) Sheet http://bbu.brookfield.com/role/EquityDetails EQUITY (Details) Details http://bbu.brookfield.com/role/EquityAccountedInvestmentsTables 77 false false R78.htm 2417402 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) Sheet http://bbu.brookfield.com/role/AccumulatedOtherComprehensiveIncomeLossDetails ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) Details http://bbu.brookfield.com/role/AccumulatedOtherComprehensiveIncomeLossTables 78 false false R79.htm 2418402 - Disclosure - DIRECT OPERATING COSTS - Schedule of Lists of Direct Costs (Details) Sheet http://bbu.brookfield.com/role/DirectOperatingCostsScheduleOfListsOfDirectCostsDetails DIRECT OPERATING COSTS - Schedule of Lists of Direct Costs (Details) Details 79 false false R80.htm 2418403 - Disclosure - DIRECT OPERATING COSTS - Additional Information (Details) Sheet http://bbu.brookfield.com/role/DirectOperatingCostsAdditionalInformationDetails DIRECT OPERATING COSTS - Additional Information (Details) Details 80 false false R81.htm 2419402 - Disclosure - SEGMENT INFORMATION - Income Statement Captions by Segment (Details) Sheet http://bbu.brookfield.com/role/SegmentInformationIncomeStatementCaptionsBySegmentDetails SEGMENT INFORMATION - Income Statement Captions by Segment (Details) Details 81 false false R82.htm 2419403 - Disclosure - SEGMENT INFORMATION - Assets by Segment (Details) Sheet http://bbu.brookfield.com/role/SegmentInformationAssetsBySegmentDetails SEGMENT INFORMATION - Assets by Segment (Details) Details 82 false false R83.htm 2420402 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Interest and Income Taxes Paid (Details) Sheet http://bbu.brookfield.com/role/SupplementalCashFlowInformationInterestAndIncomeTaxesPaidDetails SUPPLEMENTAL CASH FLOW INFORMATION - Interest and Income Taxes Paid (Details) Details 83 false false R84.htm 2420403 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Working Capital (Details) Sheet http://bbu.brookfield.com/role/SupplementalCashFlowInformationNonCashWorkingCapitalDetails SUPPLEMENTAL CASH FLOW INFORMATION - Non-cash Working Capital (Details) Details 84 false false R85.htm 2421401 - Disclosure - SUBSEQUENT EVENTS - Distribution (Details) Sheet http://bbu.brookfield.com/role/SubsequentEventsDistributionDetails SUBSEQUENT EVENTS - Distribution (Details) Details 85 false false R86.htm 2421402 - Disclosure - SUBSEQUENT EVENTS - Acquisition of Teekay Offshore Partners (Details) Sheet http://bbu.brookfield.com/role/SubsequentEventsAcquisitionOfTeekayOffshorePartnersDetails SUBSEQUENT EVENTS - Acquisition of Teekay Offshore Partners (Details) Details 86 false false R87.htm 2421403 - Disclosure - SUBSEQUENT EVENTS - Acquisition of Westinghouse Electric Company (Details) Sheet http://bbu.brookfield.com/role/SubsequentEventsAcquisitionOfWestinghouseElectricCompanyDetails SUBSEQUENT EVENTS - Acquisition of Westinghouse Electric Company (Details) Details 87 false false R88.htm 2421404 - Disclosure - SUBSEQUENT EVENTS - GrafTech Secondary Offering and Concurrent Share Buyback (Details) Sheet http://bbu.brookfield.com/role/SubsequentEventsGraftechSecondaryOfferingAndConcurrentShareBuybackDetails SUBSEQUENT EVENTS - GrafTech Secondary Offering and Concurrent Share Buyback (Details) Details 88 false false All Reports Book All Reports bbu-20180630.xml bbu-20180630.xsd bbu-20180630_cal.xml bbu-20180630_def.xml bbu-20180630_lab.xml bbu-20180630_pre.xml http://xbrl.sec.gov/invest/2013-01-31 http://xbrl.sec.gov/dei/2014-01-31 http://xbrl.sec.gov/country/2017-01-31 http://xbrl.ifrs.org/taxonomy/2017-03-09/ifrs-full true true