Liabilities / Assets
11th percentile
Higher debt load relative to assets than 11% of similar nonprofits.
EIN 04-3177556 • 501(c)3 • Cambridge, MA
Profile
To provide health and life insurance benefits to covered eligible retirees of massachusetts institute of technology and their dependents, as well as individuals receiving long-term disability benefits for at least three years.
Precomputed percentiles relative to similar nonprofits. These scores are descriptive rather than judgmental.
Liabilities / Assets
11th percentile
Higher debt load relative to assets than 11% of similar nonprofits.
Liabilities / Revenue
33rd percentile
Higher debt load relative to revenue than 33% of similar nonprofits.
Net Margin
75th percentile
Higher net margin than 75% of similar nonprofits.
Top Officer Pay
74th percentile
Higher top officer pay than 74% of similar nonprofits.
Top officer pay equals 5.6% of source-year revenue.
Asset Growth
52nd percentile
Faster asset growth than 52% of similar nonprofits.
Revenue Growth
6th percentile
Faster revenue growth than 6% of similar nonprofits.
Assets
Up$1,010,214,000
Up $72,491,000 (+7.7%) from 2023
Liabilities
Up$24,735,000
Up $1,761,000 (+7.7%) from 2023
Net Assets
Up$985,479,000
Up $70,730,000 (+7.7%) from 2023
Revenue
Down$66,489,000
Down $9,454,000 (-12%) from 2023
Expenses
Up$54,982,000
Up $3,998,000 (+7.8%) from 2023
Net Income
Down$11,507,000
Down $13,452,000 (-54%) from 2023
Most recent year
2024 • Form 990Detailed filing. Detailed filing data is available for this year.
To provide health and life insurance benefits to covered eligible retirees of massachusetts institute of technology and their dependents.
To provide health and life insurance benefits to covered eligible retirees of massachusetts institute of technology and their dependents, as well as individuals receiving long-term disability benefits for at least three years.
| Line | Beginning | End | Change |
|---|---|---|---|
| Assets | |||
| Investments Other Securities | $653,404,000 | $709,972,000 | ▲ $56,568,000 |
| Investments in Publicly Traded Securities | $245,835,000 | $251,534,000 | ▲ $5,699,000 |
| Cash and Non-Interest-Bearing Accounts | $30,704,000 | $35,650,000 | ▲ $4,946,000 |
| Receivable From Disqualified Prsn | $0 | $0 | → $0 |
| Receivables From Officers Etc | $0 | $0 | → $0 |
| Investments Program Related | $0 | - | - |
| Land, Buildings, and Equipment, Net | $0 | $0 | → $0 |
| Loans From Officers Directors | $0 | $0 | → $0 |
| Total Assets | $937,723,000 | $1,010,214,000 | ▲ $72,491,000 |
| Other Assets Total | $7,780,000 | $13,058,000 | ▲ $5,278,000 |
| Liabilities | |||
| Accounts Payable and Accrued Expenses | $4,836,000 | $12,607,000 | ▲ $7,771,000 |
| Other Liabilities | $18,138,000 | $12,128,000 | ▼ $6,010,000 |
| Total Liabilities | $22,974,000 | $24,735,000 | ▲ $1,761,000 |
| Net Assets / Fund Balance | |||
| Net Assets Without Donor Restrictions | $914,749,000 | $985,479,000 | ▲ $70,730,000 |
| Total Net Assets Fund Balance | $914,749,000 | $985,479,000 | ▲ $70,730,000 |
| Total Liabilities and Net Assets / Fund Balance | $937,723,000 | $1,010,214,000 | ▲ $72,491,000 |
| Asset | Book Value | Depreciation | Basis |
|---|---|---|---|
| Other Securities | $2,000 | - | - |
| Closely Held Equity Interests | $3,491,000 | - | - |
| Financial Derivatives | $1,521,000 | - | - |
| Name | Title |
|---|---|
| Glen Shor | Trustee |
| Seth Alexander | Trustee |
| Contractor | Services | Location | Compensation |
|---|---|---|---|
| State Street Bank | Financial Custody Services | 1 Congress Street, Suite 1, Boston, MA 02114 | $321,377 |
| Wellington Group Holdings LLP | Investment Manager | 280 Congress St, Boston, MA 02210 | $127,610 |
| Line Item | Amount |
|---|---|
| Other Expenses | $5,868,000 |
| Grants and Similar Amounts Paid | $0 |
| Professional Fundraising Fees | $0 |
| Salaries, Compensation, and Employee Benefits | $0 |
| Total Fundraising Expense | $0 |
| Line Item | Program | Management | Fundraising | Total |
|---|---|---|---|---|
| Benefits to Members | $49,114,000 | - | - | $49,114,000 |
| Interest | $3,158,000 | - | - | $3,158,000 |
| Other Expenses | $1,874,000 | $836,000 | - | $836,000 |
| Total Functional Expenses | $54,146,000 | $836,000 | $0 | $54,982,000 |
| Line Item | Amount |
|---|---|
| Expenses per Audited Statements | $54,982,000 |
| Total Expenses per Audited Statements | $54,982,000 |
| Total Expenses per Form 990 | $54,982,000 |
| Expenses Not Reported on Financial Statements | $0 |
| Expenses Not Reported on Form 990 | $0 |
| Other Expense Adjustments | $0 |
| Line Item | Amount |
|---|---|
| Professional Fundraising Fees | $0 |
| Line Item | Beginning | End | Change |
|---|---|---|---|
| Loans from Officers, Directors, Trustees, and Key Employees | $0 | $0 | → $0 |
| Receivables from Disqualified Persons | $0 | $0 | → $0 |
| Receivables from Officers, Directors, Trustees, and Key Employees | $0 | $0 | → $0 |
| Liability | Amount |
|---|---|
| Investments sold but not yet purchased | $12,128,000 |
“For fiscal year 2024, the following current trustee of the MIT Welfare Benefit Plans Trust was employed by the Massachusetts Institute of Technology, of which Glen Shor was also an officer and director: Seth Alexander.”
“There are no such committees with authority to act on behalf of the governing body.”
“Mit welfare benefit plans trust's form 990 is reviewed for accuracy and completeness prior to filing under the direction of the trustees.”
“The organization's governing documents and financial statements are available upon request. The Massachusetts Institute of Technology (MIT)'s policies are available on MIT's website.”
“Barring specific action to the contrary, mit welfare benefit plans trust follows applicable written policies and procedures of massachusetts institute of technology.”
“U.S. GAAP requires an evaluation of tax positions taken and recognition of a tax liability (or asset) if the organization has taken an uncertain position that more likely than not would not be sustained upon examination by the Internal Revenue Service. The MIT Welfare Benefit Plans Trust has analyzed the tax positions taken and has concluded that as of June 30, 2024 and 2023, there are no significant uncertain positions taken or expected to be taken.”
This appendix keeps the raw XML leaves available for debugging and edge-case review. The human report above is the primary experience.
| Path | # | Value |
|---|---|---|
| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 4836000 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 12607000 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | TO PROVIDE HEALTH AND LIFE INSURANCE BENEFITS TO COVERED ELIGIBLE RETIREES OF MASSACHUSETTS INSTITUTE OF TECHNOLOGY AND THEIR DEPENDENTS, AS WELL AS INDIVIDUALS RECEIVING LONG-TERM DISABILITY BENEFITS FOR AT LEAST THREE YEARS. |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 0 |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BenefitsToMembersGrp/ProgramServicesAmt | 0 | 49114000 |
| IRS990/BenefitsToMembersGrp/TotalAmt | 0 | 49114000 |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | JODI KESSLER |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 6173248969 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 77 Massachusetts Avenue NE49-3142 |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Cambridge |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 02139 |
| IRS990/BusinessRlnWith35CtrlEntInd | 0 | false |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 30704000 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 35650000 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | false |
| IRS990/CompensationProcessOtherInd | 0 | false |
| IRS990/ConflictOfInterestPolicyInd | 0 | false |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | false |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 321377 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 127610 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 1 Congress Street |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 280 Congress St |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine2Txt | 0 | Suite 1 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | BOSTON |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | Boston |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | MA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 02114 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 02210 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | STATE STREET BANK |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | WELLINGTON GROUP HOLDINGS LLP |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | FINANCIAL CUSTODY SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | INVESTMENT MANAGER |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 49114000 |
| IRS990/CYContributionsGrantsAmt | 0 | 0 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 41131000 |
| IRS990/CYOtherExpensesAmt | 0 | 5868000 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 25358000 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 11507000 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/CYTotalExpensesAmt | 0 | 54982000 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 66489000 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/Desc | 0 | MEDICAL AND LIFE INSURANCE BENEFITS FOR ELIGIBLE RETIREES, ALONG WITH MEDICAL BENEFITS FOR THOSE RECEIVING LONG TERM DISABILITY BENEFITS FOR AT LEAST THREE YEARS, WERE PROVIDED TO APPROXIMATELY 7,380 INDIVIDUALS COVERED UNDER THE MASSACHUSETTS INSTITUTE OF TECHNOLOGY (MIT) WELFARE BENEFIT PLANS TRUST. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | false |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/DonorRstrOrQuasiEndowmentsInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | false |
| IRS990/EmployeeCnt | 0 | 0 |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 54146000 |
| IRS990/FamilyOrBusinessRlnInd | 0 | true |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 60.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 73021 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 613448 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | Glen Shor |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 1 | Seth Alexander |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 883134 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 3134866 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | Trustee |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Trustee |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | false |
| IRS990/Form990TFiledInd | 0 | true |
| IRS990/FormationYr | 0 | 1992 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/SeparateBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 35787000 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 2 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossAmountSalesAssetsGrp/SecuritiesAmt | 0 | 748195000 |
| IRS990/GrossReceiptsAmt | 0 | 778897000 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | true |
| IRS990/IndependentVotingMemberCnt | 0 | 0 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 2 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InterestGrp/ProgramServicesAmt | 0 | 3158000 |
| IRS990/InterestGrp/TotalAmt | 0 | 3158000 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 5406000 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 5344000 |
| IRS990/InvestmentIncomeGrp/UnrelatedBusinessRevenueAmt | 0 | -62000 |
| IRS990/InvestmentInJointVentureInd | 0 | true |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 653404000 |
| IRS990/InvestmentsOtherSecuritiesGrp/EOYAmt | 0 | 709972000 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsPubTradedSecGrp/BOYAmt | 0 | 245835000 |
| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 251534000 |
| IRS990/IRPDocumentCnt | 0 | 0 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 0 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 0 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 0 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 0 |
| IRS990/LegalDomicileStateCd | 0 | MA |
| IRS990/LessCostOthBasisSalesExpnssGrp/SecuritiesAmt | 0 | 712408000 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LoansFromOfficersDirectorsGrp/BOYAmt | 0 | 0 |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | false |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MiscellaneousRevenueGrp/ExclusionAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/MiscellaneousRevenueGrp/UnrelatedBusinessRevenueAmt | 0 | 0 |
| IRS990/MissionDesc | 0 | TO PROVIDE HEALTH AND LIFE INSURANCE BENEFITS TO COVERED ELIGIBLE RETIREES OF MASSACHUSETTS INSTITUTE OF TECHNOLOGY AND THEIR DEPENDENTS, AS WELL AS INDIVIDUALS RECEIVING LONG-TERM DISABILITY BENEFITS FOR AT LEAST THREE YEARS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | 914749000 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 985479000 |
| IRS990/NetGainOrLossInvestmentsGrp/ExclusionAmt | 0 | 35787000 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 35787000 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NetUnrlzdGainsLossesInvstAmt | 0 | 59223000 |
| IRS990/NoDonorRestrictionNetAssetsGrp/BOYAmt | 0 | 914749000 |
| IRS990/NoDonorRestrictionNetAssetsGrp/EOYAmt | 0 | 985479000 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OfficerMailingAddressInd | 0 | false |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 7780000 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 13058000 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 0 |
| IRS990/OtherExpensesGrp/Desc | 0 | Claims Processing |
| IRS990/OtherExpensesGrp/Desc | 1 | Administrative Expenses |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 836000 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 1874000 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 1874000 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 836000 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 18138000 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 12128000 |
| IRS990/OtherRevenueTotalAmt | 0 | 0 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrincipalOfcrBusinessName/BusinessNameLine1Txt | 0 | GLEN SHOR |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 900099 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 900099 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | Retiree Contributions |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | Employer Group Waiver Plan |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 12385000 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 12973000 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 12385000 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 12973000 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 48479000 |
| IRS990/PYContributionsGrantsAmt | 0 | 0 |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 52657000 |
| IRS990/PYOtherExpensesAmt | 0 | 2505000 |
| IRS990/PYOtherRevenueAmt | 0 | 0 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 23286000 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 24959000 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/PYTotalExpensesAmt | 0 | 50984000 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 75943000 |
| IRS990/RcvblFromDisqualifiedPrsnGrp/BOYAmt | 0 | 0 |
| IRS990/RcvblFromDisqualifiedPrsnGrp/EOYAmt | 0 | 0 |
| IRS990/ReceivablesFromOfficersEtcGrp/BOYAmt | 0 | 0 |
| IRS990/ReceivablesFromOfficersEtcGrp/EOYAmt | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 11507000 |
| IRS990/RelatedEntityInd | 0 | true |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/RentalIncomeOrLossGrp/PersonalAmt | 0 | 0 |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | true |
| IRS990/ReportLandBuildingEquipmentInd | 0 | false |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | true |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RevenueAmt | 0 | 25358000 |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/Contribution35ControlledInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionControllerInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ContributionFamilyInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ControlledDisqualifiedPrsnInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnControllIntInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/DisqualifiedPrsnOwnrIntInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ExcessBusinessHoldingsRulesInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/ListedByNameGoverningDocInd | 0 | true |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/LoanDisqualifiedPersonInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/OrganizationChangeSuprtOrgInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/PaymentSubstantialContribtrInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgNotOrganizedUSInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportedOrgSectionC456Ind | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SupportNonSupportedOrgInd | 0 | false |
| IRS990ScheduleA/Form990SchASupportingOrgGrp/SuprtOrgNoIRSDeterminationInd | 0 | false |
| IRS990ScheduleA/Form990SchAType1SuprtOrgGrp/OperateBenefitNonSuprtOrgInd | 0 | false |
| IRS990ScheduleA/Form990SchAType1SuprtOrgGrp/PowerAppointMajorityDirTrstInd | 0 | true |
| IRS990ScheduleA/IRSWrittenDeterminationInd | 0 | X |
| IRS990ScheduleA/OtherSupportSumAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrganizationsCnt | 0 | 1 |
| IRS990ScheduleA/SupportedOrganizationsTotalCnt | 0 | 1 |
| IRS990ScheduleA/SupportedOrgInformationGrp/EIN | 0 | 042103594 |
| IRS990ScheduleA/SupportedOrgInformationGrp/GoverningDocumentListedInd | 0 | true |
| IRS990ScheduleA/SupportedOrgInformationGrp/OrganizationTypeCd | 0 | 2 |
| IRS990ScheduleA/SupportedOrgInformationGrp/OtherSupportAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportAmt | 0 | 0 |
| IRS990ScheduleA/SupportedOrgInformationGrp/SupportedOrganizationName/BusinessNameLine1Txt | 0 | MASSACHUSETTS INSTITUTE OF TECHNOLOGY |
| IRS990ScheduleA/SupportingOrganization509a3Ind | 0 | X |
| IRS990ScheduleA/SupportingOrgType1Ind | 0 | X |
| IRS990ScheduleA/SupportSumAmt | 0 | 0 |
| IRS990/ScheduleBRequiredInd | 0 | false |
| IRS990ScheduleD/CloselyHeldEquityInterestsGrp/BookValueAmt | 0 | 3491000 |
| IRS990ScheduleD/CloselyHeldEquityInterestsGrp/MethodValuationCd | 0 | F |
| IRS990ScheduleD/ExpensesNotReportedAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesNotRptFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/ExpensesSubtotalAmt | 0 | 54982000 |
| IRS990ScheduleD/FinancialDerivativesGrp/BookValueAmt | 0 | 1521000 |
| IRS990ScheduleD/FinancialDerivativesGrp/MethodValuationCd | 0 | F |
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| IRS990ScheduleD/NetUnrealizedGainsInvstAmt | 0 | 59223000 |
| IRS990ScheduleD/OtherExpensesIncludedAmt | 0 | 0 |
| IRS990ScheduleD/OtherExpensesNotIncludedAmt | 0 | 0 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Amt | 0 | 12128000 |
| IRS990ScheduleD/OtherLiabilitiesOrgGrp/Desc | 0 | Investments sold but not yet purchased |
| IRS990ScheduleD/OtherRevenueAmt | 0 | 0 |
| IRS990ScheduleD/OtherRevenuesNotIncludedAmt | 0 | 0 |
| IRS990ScheduleD/OtherSecuritiesGrp/BookValueAmt | 0 | 685909000 |
| IRS990ScheduleD/OtherSecuritiesGrp/BookValueAmt | 1 | 17671000 |
| IRS990ScheduleD/OtherSecuritiesGrp/BookValueAmt | 2 | 1100000 |
| IRS990ScheduleD/OtherSecuritiesGrp/BookValueAmt | 3 | 278000 |
| IRS990ScheduleD/OtherSecuritiesGrp/BookValueAmt | 4 | 2000 |
| IRS990ScheduleD/OtherSecuritiesGrp/Desc | 0 | Partnership Investments |
| IRS990ScheduleD/OtherSecuritiesGrp/Desc | 1 | U.S. Government Agency |
| IRS990ScheduleD/OtherSecuritiesGrp/Desc | 2 | Repo |
| IRS990ScheduleD/OtherSecuritiesGrp/Desc | 3 | Preferred Stock |
| IRS990ScheduleD/OtherSecuritiesGrp/Desc | 4 | Domestic bonds |
| IRS990ScheduleD/OtherSecuritiesGrp/MethodValuationCd | 0 | F |
| IRS990ScheduleD/OtherSecuritiesGrp/MethodValuationCd | 1 | F |
| IRS990ScheduleD/OtherSecuritiesGrp/MethodValuationCd | 2 | F |
| IRS990ScheduleD/OtherSecuritiesGrp/MethodValuationCd | 3 | F |
| IRS990ScheduleD/OtherSecuritiesGrp/MethodValuationCd | 4 | F |
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| IRS990ScheduleD/RevenueNotReportedFinclStmtAmt | 0 | 0 |
| IRS990ScheduleD/RevenueSubtotalAmt | 0 | 66489000 |
| IRS990ScheduleD/SupplementalInformationDetail/ExplanationTxt | 0 | U.S. GAAP requires an evaluation of tax positions taken and recognition of a tax liability (or asset) if the organization has taken an uncertain position that more likely than not would not be sustained upon examination by the Internal Revenue Service. The MIT Welfare Benefit Plans Trust has analyzed the tax positions taken and has concluded that as of June 30, 2024 and 2023, there are no significant uncertain positions taken or expected to be taken. |
| IRS990ScheduleD/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Schedule D, Part X, Line 2 FIN 48 (ASC 740) footnote |
| IRS990ScheduleD/TotalBookValueSecuritiesAmt | 0 | 709972000 |
| IRS990ScheduleD/TotalExpensesPerForm990Amt | 0 | 54982000 |
| IRS990ScheduleD/TotalLiabilityAmt | 0 | 12128000 |
| IRS990ScheduleD/TotalRevenuePerForm990Amt | 0 | 66489000 |
| IRS990ScheduleD/TotalRevEtcAuditedFinclStmtAmt | 0 | 125712000 |
| IRS990ScheduleD/TotExpnsEtcAuditedFinclStmtAmt | 0 | 54982000 |
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| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BonusFilingOrganizationAmount | 1 | 0 |
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| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/BonusRelatedOrganizationsAmt | 1 | 0 |
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| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/CompensationBasedOnRltdOrgsAmt | 1 | 836884 |
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| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/CompReportPrior990FilingOrgAmt | 1 | 0 |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/CompReportPrior990RltdOrgsAmt | 0 | 359506 |
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| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/DeferredCompensationFlngOrgAmt | 1 | 0 |
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| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/PersonNm | 0 | Seth Alexander |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/PersonNm | 1 | Glen Shor |
| IRS990ScheduleJ/RltdOrgOfficerTrstKeyEmplGrp/TitleTxt | 0 | Trustee |
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| IRS990ScheduleJ/SupplementalInformationDetail/ExplanationTxt | 0 | An employee of the MIT Investment Management Company is eligible for incentive compensation based on the performance of the Institute's investments. A portion of their incentive compensation is paid in an initial calendar year, and the remainder is deferred to being paid in the subsequent calendar year contingent on continued service to MITIMCo through specified dates. Incentive compensation actually paid in calendar year 2023 is reflected in Column B(ii). This includes incentive compensation from prior calendar years for which payment was deferred, contingent on continued service. That amount is listed in Column F. Calendar year 2023 incentive compensation for which payment has been deferred contingent on continued service is included in Column C. |
| IRS990ScheduleJ/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Schedule J, Part I, Line 4b Supplemental nonqualified retirement plan |
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| IRS990/ScheduleORequiredInd | 0 | true |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | For fiscal year 2024, the following current trustee of the MIT Welfare Benefit Plans Trust was employed by the Massachusetts Institute of Technology, of which Glen Shor was also an officer and director: Seth Alexander. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 1 | THERE ARE NO SUCH COMMITTEES WITH AUTHORITY TO ACT ON BEHALF OF THE GOVERNING BODY. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 2 | MIT WELFARE BENEFIT PLANS TRUST'S FORM 990 IS REVIEWED FOR ACCURACY AND COMPLETENESS PRIOR TO FILING UNDER THE DIRECTION OF THE TRUSTEES. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 3 | The organization's governing documents and financial statements are available upon request. The Massachusetts Institute of Technology (MIT)'s policies are available on MIT's website. |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 4 | BARRING SPECIFIC ACTION TO THE CONTRARY, MIT WELFARE BENEFIT PLANS TRUST FOLLOWS APPLICABLE WRITTEN POLICIES AND PROCEDURES OF MASSACHUSETTS INSTITUTE OF TECHNOLOGY. |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | Form 990, Part VI, Line 2 Business Relationship |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 1 | Form 990, Part VI, Line 8b Documentation of meetings held by committees of governing body |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 2 | Form 990, Part VI, Line 11b Review of form 990 by governing body |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 3 | Form 990, Part VI, Line 19 Required documents available to the public |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 4 | Form 990, Part VI, Lines 12-14 Policies and Procedures |
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| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/DisregardedEntityName/BusinessNameLine1Txt | 0 | MASSACHUSETTS INSTITUTE OF TECHNOLOGY |
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| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | false |
| IRS990/TaxablePartyNotificationInd | 0 | false |
| IRS990/TaxExemptBondsInd | 0 | false |
| IRS990/TerminateOperationsInd | 0 | false |
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| IRS990/TotalAssetsEOYAmt | 0 | 1010214000 |
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| IRS990/TotalAssetsGrp/EOYAmt | 0 | 1010214000 |
| IRS990/TotalCompGreaterThan150KInd | 0 | true |
| IRS990/TotalContributionsAmt | 0 | 0 |
| IRS990/TotalEmployeeCnt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/ManagementAndGeneralAmt | 0 | 836000 |
| IRS990/TotalFunctionalExpensesGrp/ProgramServicesAmt | 0 | 54146000 |
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