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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule D, Part X, Line 2 FIN 48 (ASC 740) FOOTNOTE</FormAndLineReferenceDesc>
        <ExplanationTxt>MANAGEMENT ANNUALLY REVIEWS ITS TAX POSITIONS AND HAS DETERMINED THAT THERE ARE NO MATERIAL UNCERTAIN TAX POSITIONS THAT REQUIRE RECOGNITION IN THE ACCOMPANYING CONSOLIDATED BALANCE SHEETS AS OF SEPTEMBER 30, 2023 OR 2022.</ExplanationTxt>
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          <BusinessNameLine1Txt>TEXAS CHILDREN'S HOSPITAL</BusinessNameLine1Txt>
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          <AddressLine1Txt>6621 FANNIN STREET</AddressLine1Txt>
          <CityNm>HOUSTON</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>77030</ZIPCd>
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        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>1033853</CashGrantAmt>
        <PurposeOfGrantTxt>GENERAL SUPPORT TO MAINTAIN ONGOING OPERATIONS OF LABORATORY AT TEXAS CHILDREN'S HOSPITAL.</PurposeOfGrantTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule I, Part I, Line 2 Procedures for monitoring use of grant funds.</FormAndLineReferenceDesc>
        <ExplanationTxt>A DETAILED ITEMIZATION OF COSTS INCURRED BY THE CAIN FOUNDATION LABORATORIES IS SUBMITTED BY TEXAS CHILDREN'S HOSPITAL TO THE GORDON AND MARY CAIN PEDIATRIC NEUROLOGY RESEARCH FOUNDATION FOLLOWING THE CLOSE OF THE PRIOR FISCAL YEAR FOR WHICH GRANT FUNDS HAD BEEN ALLOCATED, BUT NOT YET PAID. THE INVOICE FOLLOWS AN INTERNAL REVIEW PROCESS AT THE CAIN FOUNDATION LABORATORIES FOR ACCURACY, AND IS THEN FORWARDED TO THE PRESIDENT OF THE GORDON AND MARY CAIN PEDIATRIC NEUROLOGY RESEARCH FOUNDATION FOR APPROVAL AND PAYMENT.</ExplanationTxt>
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      <SupplementalNonqualRtrPlanInd>true</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
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          <BusinessNameLine1Txt>LANCE A LIGHTFOOT</BusinessNameLine1Txt>
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        <TitleTxt>BOARD SECRETARY THROUGH 3/8/23 / SENIOR VICE PRESIDENT ALL YEAR</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>753414</CompensationBasedOnRltdOrgsAmt>
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        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>1964896</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <BusinessName>
          <BusinessNameLine1Txt>AISHA JAMAL</BusinessNameLine1Txt>
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        <TitleTxt>BOARD SECRETARY AS OF 3/9/23 / VICE PRESIDENT ALL YEAR</TitleTxt>
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        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>18225</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3 Arrangement used to establish the top management official's compensation</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation for the organization's top management official is established by Texas Children's and Texas Children's Hospital, using the following methods: *Compensation Committee *Independent Compensation Consultant *Compensation survey or study *Approval by the board or compensation committee</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4b 457(F) PLANS</FormAndLineReferenceDesc>
        <ExplanationTxt>457(F) PLANS: PAID/DEFERRED AISHA JAMAL 0 / 30,000 LANCE A. LIGHTFOOT 132,705 / 125,500 457(F): THE 457(F) PLANS ARE NON-QUALIFIED DEFERRED COMPENSATION PLANS THAT ALLOW EXECUTIVES AND ELIGIBLE PHYSICIANS TO RECEIVE SUPPLEMENTAL RETIREMENT INCOME. FUNDS MAY BE CREDITED INTO THIS ACCOUNT FROM AN EMPLOYER CONTRIBUTION, CALCULATED BASED ON AN INDIVIDUAL'S TITLE AND BASE SALARY AS OF JANUARY 1. THESE EMPLOYER FUNDED CONTRIBUTIONS VEST AFTER THE EARLIER OF 5 YEARS IN THE PLAN, THE ATTAINMENT OF AGE 60 WITH 75 POINTS DETERMINED AS THE SUM OF AGE AND YEARS OF SERVICE, OR AT AGE 65. THE 475(F) PLAN ALSO CONTAINS RESIDUAL CAPITAL APPRECIATION CONTRIBUTIONS FROM A FLEXIBLE BENEFIT ACCOUNT SURPLUS. THESE CONTRIBUTIONS VEST AFTER A MINIMUM OF 5 YEARS IN THE PLAN.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 4b SPLIT-DOLLAR LIFE INSURANCE PLAN</FormAndLineReferenceDesc>
        <ExplanationTxt>Certain individuals listed at Form 990, Part VII have split-dollar life insurance policies. The premiums were paid by Texas Children's prior to calendar year 2022 and will be recovered partially or fully when the policy is terminated or transferred to the executive. Participants include the following executives: Lance A. Lightfoot.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="IRS990ScheduleO" softwareId="22016089" softwareVersionNum="2022v5.0">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part V, Line 1a NON-EMPLOYEE COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>TEXAS CHILDREN'S HOSPITAL (74-1100555) IS RESPONSIBLE FOR ALL FORM 1096 AND FORM 1099 FILINGS. AS SUCH, THIS INFORMATION IS REPORTED ON THE TEXAS CHILDREN'S HOSPITAL FORM 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 2 Family/business relationships amongst interested persons</FormAndLineReferenceDesc>
        <ExplanationTxt>GARY L. ROSENTHAL - Business relationship, L.E. SIMMONS - Business relationship, ANTHONY F. DELUCA - Business relationship</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 6 Classes of members or stockholders</FormAndLineReferenceDesc>
        <ExplanationTxt>TEXAS CHILDREN'S IS THE SOLE CORPORATE MEMBER OF THE GORDON AND MARY CAIN PEDIATRIC NEUROLOGY RESEARCH FOUNDATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7a Members or stockholders electing members of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>AFTER THE ADOPTION OF THE AMENDED AND RESTATED BYLAWS OF THE GORDON AND MARY CAIN NEUROLOGY RESEARCH FOUNDATION ON DECEMBER 16, 2016, THE NUMBER OF TRUSTEES SHALL NEVER BE LESS THAN THREE (3) OR MORE THAN SIX (6), BUT SUCH NUMBER MAY BE INCREASED OR DECREASED BY AFFIRMATIVE ACTION OF A MAJORITY OF ALL TRUSTEES. CURRENT TRUSTEES ARE GARY L. ROSENTHAL, L.E. SIMMONS, ANTHONY PETRELLO, ANTHONY DELUCA AND JOSEPH SUTTON. THE TRUSTEES HAVE BEEN APPOINTED BY OFFICIAL ACTION OF THE BOARD OF TRUSTEES OF TEXAS CHILDREN'S, A NON-PROFIT CORPORATION AND THE SOLE MEMBER OF THE BENEFICIARY, TEXAS CHILDREN'S HOSPITAL. THE TERM OF OFFICE OF EACH TRUSTEE SHALL BE THREE YEARS, EXCEPT IN THE CASE OF GARY L. ROSENTHAL. MR. ROSENTHAL WILL SERVE AS A TRUSTEE FOR LIFE. ANY VACANCY OCCURRING IN THE OFFICE OF A TRUSTEE SHALL BE FILLED BY OFFICIAL ACTION OF THE BOARD OF TRUSTEES OF TEXAS CHILDREN'S.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 7b Decisions requiring approval by members or stockholders</FormAndLineReferenceDesc>
        <ExplanationTxt>UNDER THE CURRENTLY ENACTED CORPORATE BYLAWS OF THE ORGANIZATION, A TRUSTEE SHALL HOLD OFFICE UNTIL HIS RESPECTIVE DEATH, RESIGNATION, EXPIRATION OR TERM OF OFFICE OR REMOVAL. IN ANY EVENT, A TRUSTEE SHALL CONTINUE TO HOLD OFFICE AS A TRUSTEE UNTIL HIS SUCCESSOR SHALL HAVE BEEN DULY APPOINTED OR ELECTED, AS THE CASE MAY BE, AND QUALIFIED. ANY TRUSTEE MAY BE REMOVED FROM OFFICE, WITH OR WITHOUT CAUSE, BY OFFICIAL ACTION OF THE BOARD OF TRUSTEES OF TEXAS CHILDREN'S.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 8b Documentation of meetings held by committees of governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>NO SUCH COMMITTEES EXIST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 11b Review of form 990 by governing body</FormAndLineReferenceDesc>
        <ExplanationTxt>Per a resolution approved by the member's board of trustees, the member board's audit, compliance, &amp; risk committee has delegated authority to review the organization's completed Form 990 prior to filing. Following the audit, compliance, &amp; risk Committee's review and approval, the completed Form 990 is shared with the members of the organization's board of directors and board of trustees prior to filing with the IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 12c Conflict of interest policy</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION CONSISTENTLY MONITORS AND ENFORCES THE CONFLICT OF INTEREST POLICY THROUGH TWO SEPARATE PROCESSES, ONE THAT APPLIES TO THE BOARD MEMBERS, AND A SECOND THAT APPLIES TO OFFICERS AND KEY EMPLOYEES. 1) BOARD MEMBERS: PER THE ORGANIZATION'S BOARD-APPROVED CONFLICTS REVIEW PROCESS, RESPONSES TO THE ANNUAL CONFLICTS QUESTIONNAIRE ARE REVIEWED BY THE MEMBER'S BOARD LEADERSHIP AND PRESENTED TO THE MEMBER'S AUDIT, COMPLIANCE, &amp; RISK COMMITTEE. IF THE COMMITTEE DEEMS THERE ARE ANY SIGNIFICANT ISSUES, THE RESPONSES ARE THEN REVIEWED BY THE MEMBER BOARD'S EXECUTIVE COMMITTEE AND ANY REQUIRED ACTION (RECUSEMENT FROM BOARD DELIBERATIONS RELATED TO THE CONFLICT, ETC.) IS TAKEN IN ACCORDANCE WITH THE ORGANIZATION'S BOARD-APPROVED CODE OF CONDUCT. 2) OFFICERS / KEY EMPLOYEES: PER THE ORGANIZATION'S BOARD-APPROVED CONFLICTS REVIEW PROCESS, RESPONSES TO THE ANNUAL CONFLICTS QUESTIONNAIRE ARE REVIEWED BY THE COMPLIANCE SERVICES DEPARTMENT. IF THE DEPARTMENT DEEMS THERE ARE ANY SIGNIFICANT ISSUES, REQUIRED ACTION IS TAKEN IN ACCORDANCE WITH THE ORGANIZATION'S BOARD-APPROVED CODE OF CONDUCT AND THE BOARD IS NOTIFIED OF SUCH ACTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Line 19 Required documents available to the public</FormAndLineReferenceDesc>
        <ExplanationTxt>THE GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
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