<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.24.1.u1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>2797</ContextCount>
  <ElementCount>251</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>450</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>17</UnitCount>
  <MyReports>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0000001 - Document - Cover</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/Cover</Role>
      <ShortName>Cover</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0000002 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0000003 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0000004 - Statement - Unaudited Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/UnauditedConsolidatedStatementsofOperations</Role>
      <ShortName>Unaudited Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0000005 - Statement - Unaudited Consolidated Statements of Changes in Net Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/UnauditedConsolidatedStatementsofChangesinNetAssets</Role>
      <ShortName>Unaudited Consolidated Statements of Changes in Net Assets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0000006 - Statement - Unaudited Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/UnauditedConsolidatedStatementsofCashFlows</Role>
      <ShortName>Unaudited Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0000007 - Statement - Consolidated Schedule of Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ConsolidatedScheduleofInvestments</Role>
      <ShortName>Consolidated Schedule of Investments</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0000008 - Statement - Consolidated Schedule Of Investments - Foreign Currency Forward Contracts (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ConsolidatedScheduleOfInvestmentsForeignCurrencyForwardContractsParenthetical</Role>
      <ShortName>Consolidated Schedule Of Investments - Foreign Currency Forward Contracts (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0000009 - Statement - Consolidated Schedule Of Investments -Schedule Of Investments (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ConsolidatedScheduleOfInvestmentsScheduleOfInvestmentsParenthetical</Role>
      <ShortName>Consolidated Schedule Of Investments -Schedule Of Investments (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0000010 - Statement - Consolidated Schedule of Investments - Additional Information (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ConsolidatedScheduleofInvestmentsAdditionalInformationParenthetical</Role>
      <ShortName>Consolidated Schedule of Investments - Additional Information (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0000011 - Disclosure - ORGANIZATION, BUSINESS, AND BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ORGANIZATIONBUSINESSANDBASISOFPRESENTATION</Role>
      <ShortName>ORGANIZATION, BUSINESS, AND BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0000012 - Disclosure - AGREEMENTS AND RELATED PARTY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/AGREEMENTSANDRELATEDPARTYTRANSACTIONS</Role>
      <ShortName>AGREEMENTS AND RELATED PARTY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0000013 - Disclosure - INVESTMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTS</Role>
      <ShortName>INVESTMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0000014 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INCOMETAXES</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0000015 - Disclosure - BORROWINGS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/BORROWINGS</Role>
      <ShortName>BORROWINGS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0000016 - Disclosure - DERIVATIVE INSTRUMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/DERIVATIVEINSTRUMENTS</Role>
      <ShortName>DERIVATIVE INSTRUMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0000017 - Disclosure - COMMITMENTS AND CONTINGENCIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/COMMITMENTSANDCONTINGENCIES</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0000018 - Disclosure - FINANCIAL HIGHLIGHTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/FINANCIALHIGHLIGHTS</Role>
      <ShortName>FINANCIAL HIGHLIGHTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0000019 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/SUBSEQUENTEVENTS</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995445 - Disclosure - Insider Trading Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements</Role>
      <ShortName>Insider Trading Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995470 - Disclosure - N-2</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/cef/role/N2</Role>
      <ShortName>N-2</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>9954701 - Disclosure - ORGANIZATION, BUSINESS, AND BASIS OF PRESENTATION (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ORGANIZATIONBUSINESSANDBASISOFPRESENTATIONPolicies</Role>
      <ShortName>ORGANIZATION, BUSINESS, AND BASIS OF PRESENTATION (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>9954702 - Disclosure - INVESTMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSTables</Role>
      <ShortName>INVESTMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://barings.com/role/INVESTMENTS</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>9954703 - Disclosure - BORROWINGS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/BORROWINGSTables</Role>
      <ShortName>BORROWINGS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://barings.com/role/BORROWINGS</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>9954704 - Disclosure - DERIVATIVE INSTRUMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/DERIVATIVEINSTRUMENTSTables</Role>
      <ShortName>DERIVATIVE INSTRUMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://barings.com/role/DERIVATIVEINSTRUMENTS</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>9954705 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/COMMITMENTSANDCONTINGENCIESTables</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://barings.com/role/COMMITMENTSANDCONTINGENCIES</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>9954706 - Disclosure - FINANCIAL HIGHLIGHTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/FINANCIALHIGHLIGHTSTables</Role>
      <ShortName>FINANCIAL HIGHLIGHTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://barings.com/role/FINANCIALHIGHLIGHTS</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>9954707 - Disclosure - ORGANIZATION, BUSINESS, AND BASIS OF PRESENTATION (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/ORGANIZATIONBUSINESSANDBASISOFPRESENTATIONDetails</Role>
      <ShortName>ORGANIZATION, BUSINESS, AND BASIS OF PRESENTATION (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://barings.com/role/ORGANIZATIONBUSINESSANDBASISOFPRESENTATIONPolicies</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>9954708 - Disclosure - AGREEMENTS AND RELATED PARTY TRANSACTIONS - Investment Advisory Agreement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/AGREEMENTSANDRELATEDPARTYTRANSACTIONSInvestmentAdvisoryAgreementDetails</Role>
      <ShortName>AGREEMENTS AND RELATED PARTY TRANSACTIONS - Investment Advisory Agreement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>9954709 - Disclosure - AGREEMENTS AND RELATED PARTY TRANSACTIONS - Base Management Fee (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/AGREEMENTSANDRELATEDPARTYTRANSACTIONSBaseManagementFeeDetails</Role>
      <ShortName>AGREEMENTS AND RELATED PARTY TRANSACTIONS - Base Management Fee (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>9954710 - Disclosure - AGREEMENTS AND RELATED PARTY TRANSACTIONS - Income Based Fee (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/AGREEMENTSANDRELATEDPARTYTRANSACTIONSIncomeBasedFeeDetails</Role>
      <ShortName>AGREEMENTS AND RELATED PARTY TRANSACTIONS - Income Based Fee (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>9954711 - Disclosure - AGREEMENTS AND RELATED PARTY TRANSACTIONS - Capital Gains Fee (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/AGREEMENTSANDRELATEDPARTYTRANSACTIONSCapitalGainsFeeDetails</Role>
      <ShortName>AGREEMENTS AND RELATED PARTY TRANSACTIONS - Capital Gains Fee (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>9954712 - Disclosure - AGREEMENTS AND RELATED PARTY TRANSACTIONS - Administration Agreement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/AGREEMENTSANDRELATEDPARTYTRANSACTIONSAdministrationAgreementDetails</Role>
      <ShortName>AGREEMENTS AND RELATED PARTY TRANSACTIONS - Administration Agreement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>9954713 - Disclosure - INVESTMENTS - Composition of Investment Portfolio At Cost And Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSCompositionofInvestmentPortfolioAtCostAndFairValueDetails</Role>
      <ShortName>INVESTMENTS - Composition of Investment Portfolio At Cost And Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>9954714 - Disclosure - INVESTMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSNarrativeDetails</Role>
      <ShortName>INVESTMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>9954715 - Disclosure - INVESTMENTS - Industry Composition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSIndustryCompositionDetails</Role>
      <ShortName>INVESTMENTS - Industry Composition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>9954716 - Disclosure - INVESTMENTS - Geographic Composition Of Investment At Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSGeographicCompositionOfInvestmentAtFairValueDetails</Role>
      <ShortName>INVESTMENTS - Geographic Composition Of Investment At Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>9954717 - Disclosure - INVESTMENTS - Capital and Unfunded Commitments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSCapitalandUnfundedCommitmentsDetails</Role>
      <ShortName>INVESTMENTS - Capital and Unfunded Commitments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>9954718 - Disclosure - INVESTMENTS - Fair Value Level 3 (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSFairValueLevel3Details</Role>
      <ShortName>INVESTMENTS - Fair Value Level 3 (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>9954719 - Disclosure - INVESTMENTS - Investment Portfolio at Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSInvestmentPortfolioatFairValueDetails</Role>
      <ShortName>INVESTMENTS - Investment Portfolio at Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>9954720 - Disclosure - INVESTMENTS - Investment Portfolio Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSInvestmentPortfolioMeasuredatFairValueonaRecurringBasisUsingSignificantUnobservableInputsDetails</Role>
      <ShortName>INVESTMENTS - Investment Portfolio Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>9954721 - Disclosure - INVESTMENTS - Schedule of Recurring and Non Recurring Fee Income (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INVESTMENTSScheduleofRecurringandNonRecurringFeeIncomeDetails</Role>
      <ShortName>INVESTMENTS - Schedule of Recurring and Non Recurring Fee Income (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>9954722 - Disclosure - INCOME TAXES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/INCOMETAXESDetails</Role>
      <ShortName>INCOME TAXES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://barings.com/role/INCOMETAXES</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>9954723 - Disclosure - BORROWINGS - Schedule of Borrowings Outstanding (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/BORROWINGSScheduleofBorrowingsOutstandingDetails</Role>
      <ShortName>BORROWINGS - Schedule of Borrowings Outstanding (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>9954724 - Disclosure - BORROWINGS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/BORROWINGSNarrativeDetails</Role>
      <ShortName>BORROWINGS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>9954725 - Disclosure - BORROWINGS - ING Capital Credit Facility (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/BORROWINGSINGCapitalCreditFacilityDetails</Role>
      <ShortName>BORROWINGS - ING Capital Credit Facility (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>9954726 - Disclosure - BORROWINGS - February 2027 Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://barings.com/role/BORROWINGSFebruary2027NotesDetails</Role>
      <ShortName>BORROWINGS - February 2027 Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>9954727 - Disclosure - DERIVATIVE INSTRUMENTS - Foreign Currency Forward Contracts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/DERIVATIVEINSTRUMENTSForeignCurrencyForwardContractsDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS - Foreign Currency Forward Contracts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>9954728 - Disclosure - DERIVATIVE INSTRUMENTS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/DERIVATIVEINSTRUMENTSNarrativeDetails</Role>
      <ShortName>DERIVATIVE INSTRUMENTS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>9954729 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/COMMITMENTSANDCONTINGENCIESNarrativeDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>9954730 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/COMMITMENTSANDCONTINGENCIESDetails</Role>
      <ShortName>COMMITMENTS AND CONTINGENCIES (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://barings.com/role/COMMITMENTSANDCONTINGENCIESTables</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>9954731 - Disclosure - FINANCIAL HIGHLIGHTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/FINANCIALHIGHLIGHTSDetails</Role>
      <ShortName>FINANCIAL HIGHLIGHTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://barings.com/role/FINANCIALHIGHLIGHTSTables</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="bdc-20240331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>9954732 - Disclosure - SUBSEQUENT EVENTS (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://barings.com/role/SUBSEQUENTEVENTSDetails</Role>
      <ShortName>SUBSEQUENT EVENTS (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://barings.com/role/SUBSEQUENTEVENTS</ParentRole>
      <Position>54</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Warning">[ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 2 fact(s) appearing in ix:hidden were eligible for transformation: bdc:DebtInstrumentOwnershipPercentageForImmediateConversion, bdc:InvestmentCompanyRemainingAverageLifeToMaturity -  bdc-20240331.htm 4</Log>
    <Log type="Warning">[EXG.rendering.tooManyDimensions] Presentation group http://barings.com/role/INVESTMENTSNarrativeDetails with 16 axes could have more than 666 billion cells.  Split up this presentation group and see EXG, Rendering, to see how to reduce the number of combinations by selecting fewer members for each axis. - bdc-20240331.htm  - bdc-20240331.htm </Log>
  </Logs>
  <InputFiles>
    <File doctype="10-Q" isDefinitelyFs="true" isUsgaap="true" original="bdc-20240331.htm">bdc-20240331.htm</File>
    <File>bdc-20240331.xsd</File>
    <File>bdc-20240331_cal.xml</File>
    <File>bdc-20240331_def.xml</File>
    <File>bdc-20240331_lab.xml</File>
    <File>bdc-20240331_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="9389">http://fasb.org/us-gaap/2023</BaseTaxonomy>
    <BaseTaxonomy items="13">http://xbrl.sec.gov/cef/2023</BaseTaxonomy>
    <BaseTaxonomy items="28">http://xbrl.sec.gov/dei/2023</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2023</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
