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| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 0 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 0 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 0 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | ACCESS TO GROUP MEDICAL AND/OR DENTAL COVERAGE DURING RETIREMENT |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 0 |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BenefitsToMembersGrp/TotalAmt | 0 | 0 |
| IRS990/BooksInCareOfDetail/PersonNm | 0 | THE NORTHERN TRUST COMPANY |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 3126306000 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 50 S LASALLE STREET |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | CHICAGO |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 60676 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CapStkTrPrinCurrentFundsGrp/BOYAmt | 0 | 0 |
| IRS990/CapStkTrPrinCurrentFundsGrp/EOYAmt | 0 | 0 |
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| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 0 |
| IRS990/ChangeToOrgDocumentsInd | 0 | true |
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| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompCurrentOfcrDirectorsGrp/TotalAmt | 0 | 0 |
| IRS990/CompDisqualPersonsGrp/TotalAmt | 0 | 0 |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | false |
| IRS990/CompensationProcessOtherInd | 0 | false |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 0 |
| IRS990/ConflictOfInterestPolicyInd | 0 | false |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | true |
| IRS990/ContractTerminationInd | 0 | X |
| IRS990/CostOfGoodsSoldAmt | 0 | 0 |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 0 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 0 |
| IRS990/CYOtherExpensesAmt | 0 | 0 |
| IRS990/CYOtherRevenueAmt | 0 | 0 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | 0 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/CYTotalExpensesAmt | 0 | 0 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 0 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | false |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DeferredRevenueGrp/BOYAmt | 0 | 0 |
| IRS990/DeferredRevenueGrp/EOYAmt | 0 | 0 |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
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| IRS990/Desc | 0 | THE ORGANIZATION WILL PAY RETIREE HEALTH BENEFITS ACCORDING TO THE TERMS OF THE TRUST AGREEMENT AND THE TEXAS INSTRUMENTS RETIREES HEALTH BENEFIT PLAN. SUBSTANTIALLY ALL OF THE OPERATIONS OF THE TRUST WILL BE USED IN FURTHERANCE OF PROVIDING LIFE, SICK OR OTHER BENEFITS TO ITS MEMBERS, THEIR DEPENDENTS, OR THEIR DESIGNATED BENEFICIARIES. |
| IRS990/DescribedInSection501c3Ind | 0 | false |
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| IRS990/ElectionOfBoardMembersInd | 0 | true |
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| IRS990/EscrowAccountLiabilityGrp/EOYAmt | 0 | 0 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesAccountingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesLegalGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesLobbyingGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesManagementGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 0 |
| IRS990/FeesForServicesProfFundraising/TotalAmt | 0 | 0 |
| IRS990/FeesForSrvcInvstMgmntFeesGrp/TotalAmt | 0 | 0 |
| IRS990/FinalReturnInd | 0 | X |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignGrantsGrp/TotalAmt | 0 | 0 |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/InstitutionalTrusteeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/PersonNm | 0 | THE NORTHERN TRUST COMPANY |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | TRUSTEE |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | false |
| IRS990/FormationYr | 0 | 2004 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | false |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/FundraisingDirectExpensesAmt | 0 | 0 |
| IRS990/FundraisingGrossIncomeAmt | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GamingDirectExpensesAmt | 0 | 0 |
| IRS990/GamingGrossIncomeAmt | 0 | 0 |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 1 |
| IRS990/GrantsPayableGrp/BOYAmt | 0 | 0 |
| IRS990/GrantsPayableGrp/EOYAmt | 0 | 0 |
| IRS990/GrantsToDomesticIndividualsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToDomesticOrgsGrp/TotalAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossReceiptsAmt | 0 | 0 |
| IRS990/GrossSalesOfInventoryAmt | 0 | 0 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | false |
| IRS990/IncmFromInvestBondProceedsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/IndependentAuditFinclStmtInd | 0 | false |
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| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartIIIInd | 0 | X |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIIInd | 0 | X |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 0 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 0 |
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| IRS990/InvestmentsPubTradedSecGrp/EOYAmt | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 0 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
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| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 0 |
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| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | false |
| IRS990/MethodOfAccountingOtherInd | 0 | X |
| IRS990/MinutesOfGoverningBodyInd | 0 | true |
| IRS990/MissionDesc | 0 | TEXAS INSTRUMENTS INCORPORATED ("TI") OFFERS ACCESS TO GROUP MEDICAL AND/OR DENTAL COVERAGE DURING RETIREMENT TO U.S. RETIREES WHO SATISFY AGE AND SERVICE REQUIREMENTS. TI CONTRIBUTES TOWARD THE COST OF RETIREE MEDICAL BENEFITS FOR CERTAIN RETIREES AND THEIR DEPENDENTS. TI FUNDS ITS SHARE OF SUCH COSTS THROUGH CONTRIBUTIONS TO THE VEBA TRUSTS. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/MortgNotesPyblScrdInvstPropGrp/BOYAmt | 0 | 0 |
| IRS990/MortgNotesPyblScrdInvstPropGrp/EOYAmt | 0 | 0 |
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| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | 0 |
| IRS990/NetGainOrLossInvestmentsGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncmFromFundraisingEvtGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeFromGamingGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | -3000 |
| IRS990/NoListedPersonsCompensatedInd | 0 | X |
| IRS990/NondeductibleContributionsInd | 0 | false |
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| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 0 |
| IRS990/OfficerMailingAddressInd | 0 | true |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501cInd | 0 | X |
| IRS990/OrgDoesNotFollowSFAS117Ind | 0 | X |
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| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 0 |
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| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990/OtherRevenueTotalAmt | 0 | 0 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 0 |
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| IRS990/PartialLiquidationInd | 0 | false |
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| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 0 |
| IRS990/PdInCapSrplsLandBldgEqpFundGrp/BOYAmt | 0 | 0 |
| IRS990/PdInCapSrplsLandBldgEqpFundGrp/EOYAmt | 0 | 0 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 0 |
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| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrepaidExpensesDefrdChargesGrp/BOYAmt | 0 | 0 |
| IRS990/PrepaidExpensesDefrdChargesGrp/EOYAmt | 0 | 0 |
| IRS990/PrincipalOfficerNm | 0 | SHANON LEONARD |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/PYContributionsGrantsAmt | 0 | 0 |
| IRS990/PYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/PYInvestmentIncomeAmt | 0 | 0 |
| IRS990/PymtTravelEntrtnmntPubOfclGrp/TotalAmt | 0 | 0 |
| IRS990/PYOtherExpensesAmt | 0 | 0 |
| IRS990/PYOtherRevenueAmt | 0 | 3255 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 0 |
| IRS990/PYRevenuesLessExpensesAmt | 0 | 3255 |
| IRS990/PYSalariesCompEmpBnftPaidAmt | 0 | 0 |
| IRS990/PYTotalExpensesAmt | 0 | 0 |
| IRS990/PYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/PYTotalRevenueAmt | 0 | 3255 |
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| IRS990/RcvblFromDisqualifiedPrsnGrp/EOYAmt | 0 | 0 |
| IRS990/ReceivablesFromOfficersEtcGrp/BOYAmt | 0 | 0 |
| IRS990/ReceivablesFromOfficersEtcGrp/EOYAmt | 0 | 0 |
| IRS990/ReconcilationRevenueExpnssAmt | 0 | 0 |
| IRS990/RelatedEntityInd | 0 | true |
| IRS990/RelatedOrganizationCtrlEntInd | 0 | false |
| IRS990/RentalIncomeOrLossGrp/PersonalAmt | 0 | 0 |
| IRS990/RentalIncomeOrLossGrp/RealAmt | 0 | 0 |
| IRS990/ReportInvestmentsOtherSecInd | 0 | false |
| IRS990/ReportLandBuildingEquipmentInd | 0 | false |
| IRS990/ReportOtherAssetsInd | 0 | false |
| IRS990/ReportOtherLiabilitiesInd | 0 | false |
| IRS990/ReportProgramRelatedInvstInd | 0 | false |
| IRS990/RoyaltiesGrp/TotalAmt | 0 | 0 |
| IRS990/RoyaltiesRevenueGrp/TotalRevenueColumnAmt | 0 | 0 |
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| IRS990/RtnEarnEndowmentIncmOthFndsGrp/EOYAmt | 0 | 0 |
| IRS990/SavingsAndTempCashInvstGrp/BOYAmt | 0 | 0 |
| IRS990/SavingsAndTempCashInvstGrp/EOYAmt | 0 | 0 |
| IRS990/ScheduleBRequiredInd | 0 | false |
| IRS990/ScheduleJRequiredInd | 0 | false |
| IRS990ScheduleN/AssetsDistributedInd | 0 | true |
| IRS990ScheduleN/AttorneyGeneralNotifiedInd | 0 | true |
| IRS990ScheduleN/BondsOutstandingInd | 0 | false |
| IRS990ScheduleN/DirectorOfSuccessorInd | 0 | false |
| IRS990ScheduleN/EmployeeOfSuccessorInd | 0 | false |
| IRS990ScheduleN/LiabilitiesPaidInd | 0 | true |
| IRS990ScheduleN/LiquidationOfAssetsTableGrp/LiquidationOfAssetsDetail/AssetsDistriOrExpnssPaidDesc | 0 | NO ASSET DISTRIBUTED |
| IRS990ScheduleN/LiquidationOfAssetsTableGrp/LiquidationOfAssetsDetail/DistributionDt | 0 | 2018-12-31 |
| IRS990ScheduleN/LiquidationOfAssetsTableGrp/LiquidationOfAssetsDetail/FairMarketValueOfAssetAmt | 0 | 0 |
| IRS990ScheduleN/LiquidationOfAssetsTableGrp/LiquidationOfAssetsDetail/IRCSectionTxt | 0 | N/A |
| IRS990ScheduleN/LiquidationOfAssetsTableGrp/LiquidationOfAssetsDetail/MethodOfFMVDeterminationTxt | 0 | N/A |
| IRS990ScheduleN/LiquidationOfAssetsTableGrp/LiquidationOfAssetsDetail/PersonNm | 0 | NA |
| IRS990ScheduleN/OwnerOfSuccessorInd | 0 | false |
| IRS990ScheduleN/ReceiveCompensationInd | 0 | false |
| IRS990ScheduleN/RequiredToNotifyAGInd | 0 | true |
| IRS990ScheduleN/SupplementalInformationDetail/ExplanationTxt | 0 | THE TRUST'S FUNDS WERE DISTRIBUTED TO PAY FOR BENEFITS BY THE END OF 2017. THE TRUST DID NOT OFFICIALLY TERMINATE UNTIL 2018. |
| IRS990ScheduleN/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | SCH N, PART I, LINE 1 |
| IRS990/ScheduleORequiredInd | 0 | true |
| IRS990ScheduleO/SupplementalInformationDetail/ExplanationTxt | 0 | FORM 990, PART III, LINE 3 THE TRUST CEASED OPERATIONS AS OF JUNE 30, 2018 AND HAD NO FURTHER ACTIVITY EXCEPT FOR CLOSING THE TRUST AS OF DECEMBER 31, 2018. SIGNIFICANT CHANGES TO GOVERNING DOCUMENTS SINCE PRIOR FORM 990 WAS FILED FORM 990, PART VI, LINE 4 TRUST HAS CEASED OPERATIONS AS OF JUNE 30, 2018. MEMBERS/STOCKHOLDERS WHO CAN ELECT GOVERNING BOARD MEMBERS FORM 990, PART VI, LINE 7A ACCORDING TO THE TRUST AGREEMENT, THE COMPANY (TEXAS INSTRUMENTS, INC.) HAS AUTHORITY TO TERMINATE THE TRUST AND THUS REVOKE TRUSTEE STATUS OF THE NORTHERN TRUST COMPANY, THE SOLE GOVERNING MEMBER. ADDRESS OF TRUSTEE FORM 990, PART VI, LINE 9 THE TRUSTEE IS THE NORTHERN TRUST COMPANY 50 SOUTH LASALLE STREET, CHICAGO, IL 60676 PROCEDURE FOR REVIEWING FORM 990 FORM 990, PART VI, LINES 11A AND 11B THE RETURN IS REVIEWED BY THE TAX AND TREASURY AND HR FINANCE DEPARTMENTS OF TEXAS INSTRUMENTS. MANNER OF DISCLOSURE OF GOVERNING DOCUMENTS FORM 990, PART VI, SECTION C, LINE 19 DOCUMENTS OF THE ENTITY ARE AVAILABLE TO PLAN PARTICIPANTS UPON WRITTEN REQUEST. ACCOUNTING METHOD FORM 990, PART XII, LINE 1 MODIFIED CASH |
| IRS990ScheduleO/SupplementalInformationDetail/FormAndLineReferenceDesc | 0 | ORGANIZATION HAS CEASED CONDUCTING PROGRAM SERVICES |
| IRS990ScheduleR/AssetExchangeInd | 0 | false |
| IRS990ScheduleR/AssetPurchaseFromOtherOrgInd | 0 | false |
| IRS990ScheduleR/AssetSaleToOtherOrgInd | 0 | false |
| IRS990ScheduleR/DivRelatedOrganizationInd | 0 | false |
| IRS990ScheduleR/GiftGrntCapContriFromOthOrgInd | 0 | false |
| IRS990ScheduleR/GiftGrntOrCapContriToOthOrgInd | 0 | false |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/ControlledOrganizationInd | 0 | false |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/DirectControllingEntityName/BusinessNameLine1Txt | 0 | NA |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/EIN | 0 | 750289970 |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/EntityTypeTxt | 0 | C Corp |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/LegalDomicileStateCd | 0 | DE |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/PrimaryActivitiesTxt | 0 | Parent Corp |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/RelatedOrganizationName/BusinessNameLine1Txt | 0 | Texas Instruments Incorporated |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/ShareOfEOYAssetsAmt | 0 | 0 |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/ShareOfTotalIncomeAmt | 0 | 0 |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/USAddress/AddressLine1Txt | 0 | 12500 TI Blvd PO BOX 660199 |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/USAddress/CityNm | 0 | Dallas |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/USAddress/StateAbbreviationCd | 0 | TX |
| IRS990ScheduleR/IdRelatedOrgTxblCorpTrGrp/USAddress/ZIPCd | 0 | 752660199 |
| IRS990ScheduleR/IdRelatedOrgTxblPartnershipGrp/RelatedOrganizationName/BusinessNameLine1Txt | 0 | NA |
| IRS990ScheduleR/IdRelatedTaxExemptOrgGrp/DisregardedEntityName/BusinessNameLine1Txt | 0 | NA |
| IRS990ScheduleR/LoansOrGuaranteesFromOthOrgInd | 0 | false |
| IRS990ScheduleR/LoansOrGuaranteesToOtherOrgInd | 0 | false |
| IRS990ScheduleR/PaidEmployeesSharingInd | 0 | false |
| IRS990ScheduleR/PerformOfServicesByOtherOrgInd | 0 | false |
| IRS990ScheduleR/PerformOfServicesForOthOrgInd | 0 | false |
| IRS990ScheduleR/ReceiptOfIntAnntsRntsRyltsInd | 0 | false |
| IRS990ScheduleR/ReimbursementPaidByOtherOrgInd | 0 | false |
| IRS990ScheduleR/ReimbursementPaidToOtherOrgInd | 0 | false |
| IRS990ScheduleR/RentalOfFacilitiesToOthOrgInd | 0 | false |
| IRS990ScheduleR/RentalOfFcltsFromOthOrgInd | 0 | false |
| IRS990ScheduleR/SharingOfFacilitiesInd | 0 | false |
| IRS990ScheduleR/TransferFromOtherOrgInd | 0 | false |
| IRS990ScheduleR/TransferToOtherOrgInd | 0 | false |
| IRS990/SchoolOperatingInd | 0 | false |
| IRS990/SignificantChangeInd | 0 | true |
| IRS990/SignificantNewProgramSrvcInd | 0 | false |
| IRS990/SubjectToExcsTaxNetInvstIncInd | 0 | false |
| IRS990/SubjectToProxyTaxInd | 0 | false |
| IRS990/SubjToTaxRmnrtnExPrchtPymtInd | 0 | false |
| IRS990/TaxablePartyNotificationInd | 0 | false |
| IRS990/TaxExemptBondLiabilitiesGrp/BOYAmt | 0 | 0 |
| IRS990/TaxExemptBondLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990/TaxExemptBondsInd | 0 | false |
| IRS990/TempOrPermanentEndowmentsInd | 0 | false |
| IRS990/TerminateOperationsInd | 0 | true |
| IRS990/TotalAssetsBOYAmt | 0 | 0 |
| IRS990/TotalAssetsEOYAmt | 0 | 0 |
| IRS990/TotalAssetsGrp/BOYAmt | 0 | 0 |
| IRS990/TotalAssetsGrp/EOYAmt | 0 | 0 |
| IRS990/TotalCompGreaterThan150KInd | 0 | false |
| IRS990/TotalContributionsAmt | 0 | 0 |
| IRS990/TotalEmployeeCnt | 0 | 0 |
| IRS990/TotalFunctionalExpensesGrp/TotalAmt | 0 | 0 |
| IRS990/TotalGrossUBIAmt | 0 | 0 |
| IRS990/TotalLiabilitiesBOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesEOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesGrp/BOYAmt | 0 | 0 |
| IRS990/TotalLiabilitiesGrp/EOYAmt | 0 | 0 |
| IRS990/TotalNetAssetsFundBalanceGrp/BOYAmt | 0 | 0 |
| IRS990/TotalNetAssetsFundBalanceGrp/EOYAmt | 0 | 0 |
| IRS990/TotalOtherCompensationAmt | 0 | 0 |
| IRS990/TotalProgramServiceRevenueAmt | 0 | 0 |
| IRS990/TotalReportableCompFromOrgAmt | 0 | 0 |
| IRS990/TotalRevenueGrp/TotalRevenueColumnAmt | 0 | 0 |
| IRS990/TotalVolunteersCnt | 0 | 0 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/BOYAmt | 0 | 0 |
| IRS990/TotLiabNetAssetsFundBalanceGrp/EOYAmt | 0 | 0 |
| IRS990/TotReportableCompRltdOrgAmt | 0 | 0 |
| IRS990/TravelGrp/TotalAmt | 0 | 0 |
| IRS990/TypeOfOrganizationTrustInd | 0 | X |
| IRS990/UnrelatedBusIncmOverLimitInd | 0 | false |
| IRS990/UnsecuredNotesLoansPayableGrp/BOYAmt | 0 | 0 |
| IRS990/UnsecuredNotesLoansPayableGrp/EOYAmt | 0 | 0 |
| IRS990/UponRequestInd | 0 | X |
| IRS990/USAddress/AddressLine1Txt | 0 | 13570 N CENTRAL EXPWY MS 3905 |
| IRS990/USAddress/CityNm | 0 | DALLAS |
| IRS990/USAddress/StateAbbreviationCd | 0 | TX |
| IRS990/USAddress/ZIPCd | 0 | 75243 |
| IRS990/VotingMembersGoverningBodyCnt | 0 | 1 |
| IRS990/VotingMembersIndependentCnt | 0 | 1 |
| IRS990/WebsiteAddressTxt | 0 | N/A |
| IRS990/WhistleblowerPolicyInd | 0 | false |
| ReturnHeader/BuildTS | 0 | 2019-02-21 02:37:17Z |
| ReturnHeader/BusinessOfficerGrp/DiscussWithPaidPreparerInd | 0 | true |
| ReturnHeader/BusinessOfficerGrp/PersonNm | 0 | SHANON LEONARD |
| ReturnHeader/BusinessOfficerGrp/PersonTitleTxt | 0 | VP, HR WW COMP & BEN |
| ReturnHeader/BusinessOfficerGrp/PhoneNum | 0 | 9729953333 |
| ReturnHeader/BusinessOfficerGrp/SignatureDt | 0 | 2019-05-02 |
| ReturnHeader/Filer/BusinessName/BusinessNameLine1Txt | 0 | TI RETIREE WELFARE BENEFIT TRUST NO 21 |
| ReturnHeader/Filer/BusinessNameControlTxt | 0 | TIRE |
| ReturnHeader/Filer/EIN | 0 | 201929479 |
| ReturnHeader/Filer/InCareOfNm | 0 | % THE NORTHERN TRUST COMPANY |
| ReturnHeader/Filer/PhoneNum | 0 | 9729953333 |
| ReturnHeader/Filer/USAddress/AddressLine1Txt | 0 | PO BOX 650311 M/S 3905 |
| ReturnHeader/Filer/USAddress/CityNm | 0 | DALLAS |
| ReturnHeader/Filer/USAddress/StateAbbreviationCd | 0 | TX |
| ReturnHeader/Filer/USAddress/ZIPCd | 0 | 75265 |
| ReturnHeader/FilingSecurityInformation/AtSubmissionCreationDeviceId | 0 | 42F9414DC8A2D8FCE05E64416B789EFA62582187 |
| ReturnHeader/FilingSecurityInformation/AtSubmissionFilingDeviceId | 0 | 3EE0EA4077A952E7D1F71D0CD73736AA8FC8EC2C |
| ReturnHeader/FilingSecurityInformation/FederalOriginalSubmissionId | 0 | 75303520191275000013 |
| ReturnHeader/FilingSecurityInformation/FederalOriginalSubmissionIdDt | 0 | 2019-05-07 |
| ReturnHeader/FilingSecurityInformation/FilingLicenseTypeCd | 0 | P |
| ReturnHeader/FilingSecurityInformation/IPAddress/IPv4AddressTxt | 0 | 164.57.159.254 |
| ReturnHeader/PreparerFirmGrp/PreparerFirmName/BusinessNameLine1Txt | 0 | ERNST & YOUNG US LLP |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/AddressLine1Txt | 0 | 425 HOUSTON STREET STE 600 |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/CityNm | 0 | FORT WORTH |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/StateAbbreviationCd | 0 | TX |
| ReturnHeader/PreparerFirmGrp/PreparerUSAddress/ZIPCd | 0 | 76102 |
| ReturnHeader/PreparerPersonGrp/PhoneNum | 0 | 8173351900 |
| ReturnHeader/PreparerPersonGrp/PreparerPersonNm | 0 | KATHLEEN M MOSELEY |
| ReturnHeader/ReturnTs | 0 | 2019-05-07T11:29:19-05:00 |
| ReturnHeader/ReturnTypeCd | 0 | 990 |
| ReturnHeader/TaxPeriodBeginDt | 0 | 2018-01-01 |
| ReturnHeader/TaxPeriodEndDt | 0 | 2018-12-31 |
| ReturnHeader/TaxYr | 0 | 2018 |