<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>755</ContextCount>
  <ElementCount>281</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>81</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>5</UnitCount>
  <MyReports>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>75000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>75010 - Statement - Consolidated Statements of Assets and Liabilities (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/StatementConsolidatedStatementsOfAssetsAndLiabilitiesUnaudited</Role>
      <ShortName>Consolidated Statements of Assets and Liabilities (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>75020 - Statement - Consolidated Statements of Assets and Liabilities (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/StatementConsolidatedStatementsOfAssetsAndLiabilitiesUnauditedParenthetical</Role>
      <ShortName>Consolidated Statements of Assets and Liabilities (Unaudited) (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>75030 - Statement - Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/StatementConsolidatedStatementsOfOperationsUnaudited</Role>
      <ShortName>Consolidated Statements of Operations (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>75040 - Statement - Consolidated Statements of Changes in Net Assets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/StatementConsolidatedStatementsOfChangesInNetAssetsUnaudited</Role>
      <ShortName>Consolidated Statements of Changes in Net Assets (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>75050 - Statement - Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/StatementConsolidatedStatementsOfCashFlowsUnaudited</Role>
      <ShortName>Consolidated Statements of Cash Flows (Unaudited)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>75060 - Statement - Consolidated Schedule of Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/StatementConsolidatedScheduleOfInvestments</Role>
      <ShortName>Consolidated Schedule of Investments</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>75070 - Statement - Consolidated Schedule of Investments (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/StatementConsolidatedScheduleOfInvestmentsParenthetical</Role>
      <ShortName>Consolidated Schedule of Investments (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.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>9</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.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>10</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>995455 - Disclosure - Organization</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureOrganization</Role>
      <ShortName>Organization</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>995465 - Disclosure - Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureSignificantAccountingPolicies</Role>
      <ShortName>Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>995475 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureRelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>995485 - Disclosure - Investments and Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurements</Role>
      <ShortName>Investments and Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>995495 - Disclosure - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureBorrowings</Role>
      <ShortName>Borrowings</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>995505 - Disclosure - Share Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureShareTransactions1</Role>
      <ShortName>Share Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>995515 - Disclosure - Earnings Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureEarningsPerShare</Role>
      <ShortName>Earnings Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>995525 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureIncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>995535 - Disclosure - Financial Highlights</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureFinancialHighlights</Role>
      <ShortName>Financial Highlights</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>995545 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureCommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>995555 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureSubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>995565 - Disclosure - Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureSignificantAccountingPolicies</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>995575 - Disclosure - Related Party Transaction (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureRelatedPartyTransactionTables</Role>
      <ShortName>Related Party Transaction (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureRelatedPartyTransactions</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>995585 - Disclosure - Investments and Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurementsTables</Role>
      <ShortName>Investments and Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurements</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>995595 - Disclosure - Borrowings (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureBorrowingsTables</Role>
      <ShortName>Borrowings (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureBorrowings</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>995605 - Disclosure - Share Transactions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureShareTransactionsTables</Role>
      <ShortName>Share Transactions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureShareTransactions1</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>995615 - Disclosure - Earnings Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureEarningsPerShareTables</Role>
      <ShortName>Earnings Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureEarningsPerShare</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>995625 - Disclosure - Financial Highlights (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureFinancialHighlightsTables</Role>
      <ShortName>Financial Highlights (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureFinancialHighlights</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>995635 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureCommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureCommitmentsAndContingencies</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>995645 - Disclosure - Significant Accounting Policies - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureSignificantAccountingPoliciesAdditionalInformationDetails</Role>
      <ShortName>Significant Accounting Policies - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>995655 - Disclosure - Related Party Transactions - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetails</Role>
      <ShortName>Related Party Transactions - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>995665 - Disclosure - Related Party Transaction - Summary of Expense Payment Subject to Reimbursement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureRelatedPartyTransactionSummaryOfExpensePaymentSubjectToReimbursementDetails</Role>
      <ShortName>Related Party Transaction - Summary of Expense Payment Subject to Reimbursement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>995675 - Disclosure - Related Party Transaction - Summary of Expense Payment Subject to Reimbursement (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureRelatedPartyTransactionSummaryOfExpensePaymentSubjectToReimbursementParentheticalDetails</Role>
      <ShortName>Related Party Transaction - Summary of Expense Payment Subject to Reimbursement (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>995685 - Disclosure - Investments and Fair Value Measurements - Schedule of Investment Portfolio at Amortized cost and Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurementsScheduleOfInvestmentPortfolioAtAmortizedCostAndFairValueDetails</Role>
      <ShortName>Investments and Fair Value Measurements - Schedule of Investment Portfolio at Amortized cost and Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>995695 - Disclosure - Investments and Fair Value Measurements - Schedule of Investment Portfolio by Industry (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurementsScheduleOfInvestmentPortfolioByIndustryDetails</Role>
      <ShortName>Investments and Fair Value Measurements - Schedule of Investment Portfolio by Industry (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>995705 - Disclosure - Investments and Fair Value Measurements - Schedule of Investment Portfolio by Geographic Composition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurementsScheduleOfInvestmentPortfolioByGeographicCompositionDetails</Role>
      <ShortName>Investments and Fair Value Measurements - Schedule of Investment Portfolio by Geographic Composition (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>995715 - Disclosure - Investments and Fair Value Measurements - Summary of Fair Value Hierarchy of Investment Portfolio (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurementsSummaryOfFairValueHierarchyOfInvestmentPortfolioDetails</Role>
      <ShortName>Investments and Fair Value Measurements - Summary of Fair Value Hierarchy of Investment Portfolio (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>995725 - Disclosure - Investments and Fair Value Measurements - Summary of Changes in Fair Value of Investments for Which Level 3 Inputs Were Used to Determine Fair Value (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurementsSummaryOfChangesInFairValueOfInvestmentsForWhichLevel3InputsWereUsedToDetermineFairValue</Role>
      <ShortName>Investments and Fair Value Measurements - Summary of Changes in Fair Value of Investments for Which Level 3 Inputs Were Used to Determine Fair Value (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>995735 - Disclosure - Investments and Fair Value Measurements - Summary of Valuation Techniques and Significant Unobservable Inputs Used in Valuation of Level 3 Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurementsSummaryOfValuationTechniquesAndSignificantUnobservableInputsUsedInValuationOfLevel3Investment</Role>
      <ShortName>Investments and Fair Value Measurements - Summary of Valuation Techniques and Significant Unobservable Inputs Used in Valuation of Level 3 Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>995745 - Disclosure - Investments and Fair Value Measurements - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureInvestmentsAndFairValueMeasurementsAdditionalInformationDetails</Role>
      <ShortName>Investments and Fair Value Measurements - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>995755 - Disclosure - Borrowings - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureBorrowingsAdditionalInformationDetails</Role>
      <ShortName>Borrowings - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>995765 - Disclosure - Borrowings - Summary of Debt Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureBorrowingsSummaryOfDebtObligationsDetails</Role>
      <ShortName>Borrowings - Summary of Debt Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>995775 - Disclosure - Borrowings - Schedule of Components of Interest Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureBorrowingsScheduleOfComponentsOfInterestExpenseDetails</Role>
      <ShortName>Borrowings - Schedule of Components of Interest Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>995785 - Disclosure - Share Transactions - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureShareTransactionsAdditionalInformationDetails</Role>
      <ShortName>Share Transactions - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>995795 - Disclosure - Share Transactions - Summary of Total Shares Issued and Proceeds (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureShareTransactionsSummaryOfTotalSharesIssuedAndProceedsDetails</Role>
      <ShortName>Share Transactions - Summary of Total Shares Issued and Proceeds (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>995805 - Disclosure - Share Transactions - Summary of Distribution Declarations and Common Shares Issued Pursuant to DRP (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureShareTransactionsSummaryOfDistributionDeclarationsAndCommonSharesIssuedPursuantToDrpDetails</Role>
      <ShortName>Share Transactions - Summary of Distribution Declarations and Common Shares Issued Pursuant to DRP (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>995815 - Disclosure - Share Transactions - Summary of Share Repurchases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureShareTransactionsSummaryOfShareRepurchasesDetails</Role>
      <ShortName>Share Transactions - Summary of Share Repurchases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>995825 - Disclosure - Share Transactions - Summary of Share Repurchases (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureShareTransactionsSummaryOfShareRepurchasesParentheticalDetails</Role>
      <ShortName>Share Transactions - Summary of Share Repurchases (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>995835 - Disclosure - Earnings Per Share - Summary of Computation of Basic and Diluted Earnings Per Common Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureEarningsPerShareSummaryOfComputationOfBasicAndDilutedEarningsPerCommonShareDetails</Role>
      <ShortName>Earnings Per Share - Summary of Computation of Basic and Diluted Earnings Per Common Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>995845 - Disclosure - Income Taxes - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureIncomeTaxesAdditionalInformationDetails</Role>
      <ShortName>Income Taxes - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>995855 - Disclosure - Financial Highlights - Schedule of Financial Highlights (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureFinancialHighlightsScheduleOfFinancialHighlightsDetails</Role>
      <ShortName>Financial Highlights - Schedule of Financial Highlights (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>995865 - Disclosure - Financial Highlights - Schedule of Financial Highlights (Parenthetical) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureFinancialHighlightsScheduleOfFinancialHighlightsParentheticalDetails</Role>
      <ShortName>Financial Highlights - Schedule of Financial Highlights (Parenthetical) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>995875 - Disclosure - Commitments and Contingencies - Schedule of Outstanding Commitments to Fund Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfOutstandingCommitmentsToFundInvestmentsDetails</Role>
      <ShortName>Commitments and Contingencies - Schedule of Outstanding Commitments to Fund Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="ck0001860424-20260331.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>995885 - Disclosure - Subsequent Events - Additional Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://onexdirectlending.com/20260331/taxonomy/role/DisclosureSubsequentEventsAdditionalInformationDetails</Role>
      <ShortName>Subsequent Events - Additional Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</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="10-Q" isDefinitelyFs="true" isUsgaap="true" original="ck0001860424-20260331.htm">ck0001860424-20260331.htm</File>
    <File>ck0001860424-20260331.xsd</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy items="2510">http://fasb.org/us-gaap/2025</BaseTaxonomy>
    <BaseTaxonomy items="30">http://xbrl.sec.gov/dei/2025</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/ecd/2025</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>false</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
