| IRS990/AccountantCompileOrReviewInd | 0 | false |
| IRS990/AccountsPayableAccrExpnssGrp/BOYAmt | 0 | 68987499 |
| IRS990/AccountsPayableAccrExpnssGrp/EOYAmt | 0 | 78022237 |
| IRS990/AccountsReceivableGrp/BOYAmt | 0 | 31019590 |
| IRS990/AccountsReceivableGrp/EOYAmt | 0 | 36212228 |
| IRS990/ActivitiesConductedPrtshpInd | 0 | false |
| IRS990/ActivityOrMissionDesc | 0 | In the spirit of Christ and the example of Francis of Assisi, the Mission of OSF Healthcare is to serve persons with the greatest care and love in a community that celebrates the gift of life. |
| IRS990/AdvertisingGrp/ManagementAndGeneralAmt | 0 | 989533 |
| IRS990/AdvertisingGrp/ProgramServicesAmt | 0 | 142196 |
| IRS990/AdvertisingGrp/TotalAmt | 0 | 1131729 |
| IRS990/AllOtherContributionsAmt | 0 | 10000 |
| IRS990/AllOtherExpensesGrp/FundraisingAmt | 0 | 0 |
| IRS990/AllOtherExpensesGrp/ManagementAndGeneralAmt | 0 | 2765049 |
| IRS990/AllOtherExpensesGrp/ProgramServicesAmt | 0 | 7990132 |
| IRS990/AllOtherExpensesGrp/TotalAmt | 0 | 10755181 |
| IRS990/AnnualDisclosureCoveredPrsnInd | 0 | true |
| IRS990/AuditCommitteeInd | 0 | true |
| IRS990/BackupWthldComplianceInd | 0 | true |
| IRS990/BooksInCareOfDetail/BusinessName/BusinessNameLine1Txt | 0 | Michael M Allen |
| IRS990/BooksInCareOfDetail/PhoneNum | 0 | 3096557708 |
| IRS990/BooksInCareOfDetail/USAddress/AddressLine1Txt | 0 | 800 NE Glen Oak Ave |
| IRS990/BooksInCareOfDetail/USAddress/CityNm | 0 | Peoria |
| IRS990/BooksInCareOfDetail/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/BooksInCareOfDetail/USAddress/ZIPCd | 0 | 61603 |
| IRS990/BusinessRlnWithFamMemInd | 0 | false |
| IRS990/BusinessRlnWithOfficerEntInd | 0 | false |
| IRS990/BusinessRlnWithOrgMemInd | 0 | false |
| IRS990/CashNonInterestBearingGrp/BOYAmt | 0 | 31272 |
| IRS990/CashNonInterestBearingGrp/EOYAmt | 0 | 27302 |
| IRS990/ChangeToOrgDocumentsInd | 0 | false |
| IRS990/CntrctRcvdGreaterThan100KCnt | 0 | 23 |
| IRS990/CollectionsOfArtInd | 0 | false |
| IRS990/CompensationFromOtherSrcsInd | 0 | false |
| IRS990/CompensationProcessCEOInd | 0 | true |
| IRS990/CompensationProcessOtherInd | 0 | true |
| IRS990/ConferencesMeetingsGrp/ManagementAndGeneralAmt | 0 | 147340 |
| IRS990/ConferencesMeetingsGrp/ProgramServicesAmt | 0 | 398640 |
| IRS990/ConferencesMeetingsGrp/TotalAmt | 0 | 545980 |
| IRS990/ConflictOfInterestPolicyInd | 0 | true |
| IRS990/ConservationEasementsInd | 0 | false |
| IRS990/ConsolidatedAuditFinclStmtInd | 0 | true |
| IRS990/ContractorCompensationGrp/CompensationAmt | 0 | 10435961 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 1 | 758728 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 2 | 611399 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 3 | 537500 |
| IRS990/ContractorCompensationGrp/CompensationAmt | 4 | 432000 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 0 | 303 NORTH WILLIAM KUMPF BOULEVARD |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 1 | 6000 NORTH ALLEN ROAD |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 2 | 111 OAKWOOD ROAD |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 3 | 310 4TH AVE |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine1Txt | 4 | 13003 W MOORE MEADOWS COURT |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/AddressLine2Txt | 0 | S SUITE 5010 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 0 | PEORIA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 1 | PEORIA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 2 | EAST PEORIA |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 3 | MINNEAPOLIS |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/CityNm | 4 | ST LOUIS |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 0 | IL |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 1 | IL |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 2 | IL |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 3 | MN |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/StateAbbreviationCd | 4 | MO |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 0 | 616052507 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 1 | 616143294 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 2 | 616151941 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 3 | 55415 |
| IRS990/ContractorCompensationGrp/ContractorAddress/USAddress/ZIPCd | 4 | 63127 |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 0 | GREAT PLAINS ORTHOPAEDICS |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 1 | MIDWEST ORTHOPAEDIC CENTER SC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 2 | CENTRAL ILLINOIS RADIOLOGICAL ASSOC |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 3 | URGENT CARE PARTNERS |
| IRS990/ContractorCompensationGrp/ContractorName/BusinessName/BusinessNameLine1Txt | 4 | WEST CONSULTANT LLC |
| IRS990/ContractorCompensationGrp/ServicesDesc | 0 | ORTHOPAEDIC SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 1 | ORTHOPAEDIC SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 2 | RADIOLOGICAL SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 3 | URGENT CARE SERVICES |
| IRS990/ContractorCompensationGrp/ServicesDesc | 4 | CONSULTING |
| IRS990/CreditCounselingInd | 0 | false |
| IRS990/CYBenefitsPaidToMembersAmt | 0 | 0 |
| IRS990/CYContributionsGrantsAmt | 0 | 129770 |
| IRS990/CYGrantsAndSimilarPaidAmt | 0 | 0 |
| IRS990/CYInvestmentIncomeAmt | 0 | 160172 |
| IRS990/CYOtherExpensesAmt | 0 | 172551543 |
| IRS990/CYOtherRevenueAmt | 0 | 933991 |
| IRS990/CYProgramServiceRevenueAmt | 0 | 362959737 |
| IRS990/CYRevenuesLessExpensesAmt | 0 | -290527646 |
| IRS990/CYSalariesCompEmpBnftPaidAmt | 0 | 482159773 |
| IRS990/CYTotalExpensesAmt | 0 | 654711316 |
| IRS990/CYTotalFundraisingExpenseAmt | 0 | 0 |
| IRS990/CYTotalProfFndrsngExpnsAmt | 0 | 0 |
| IRS990/CYTotalRevenueAmt | 0 | 364183670 |
| IRS990/DecisionsSubjectToApprovaInd | 0 | true |
| IRS990/DeductibleArtContributionInd | 0 | false |
| IRS990/DeductibleNonCashContriInd | 0 | false |
| IRS990/DelegationOfMgmtDutiesInd | 0 | false |
| IRS990/DepreciationDepletionGrp/ManagementAndGeneralAmt | 0 | 1232785 |
| IRS990/DepreciationDepletionGrp/ProgramServicesAmt | 0 | 4212205 |
| IRS990/DepreciationDepletionGrp/TotalAmt | 0 | 5444990 |
| IRS990/Desc | 0 | TO PROVIDE PRIMARY CARE, SPECIALTY CARE AND MEDICAL SUPERVISION THROUGHOUT THE OSF HEALTHCARE SYSTEM. OSF MULTISPECIALTY SERVICES PROVIDES SERVICES AT 131 LOCATIONS IN ILLINOIS AND MICHIGAN. OSF MULTISPECIALTY GROUP HAS 617 EMPLOYED PHYSICIANS AND 441 EMPLOYED ADVANCED PRACTITIONERS AND PROVIDED 2,141,617 PATIENT VISITS IN FY 2019. |
| IRS990/DescribedInSection501c3Ind | 0 | true |
| IRS990/DisregardedEntityInd | 0 | false |
| IRS990/DocumentRetentionPolicyInd | 0 | true |
| IRS990/DonorAdvisedFundInd | 0 | false |
| IRS990/ElectionOfBoardMembersInd | 0 | true |
| IRS990/EmployeeCnt | 0 | 4803 |
| IRS990/EmploymentTaxReturnsFiledInd | 0 | true |
| IRS990/EngagedInExcessBenefitTransInd | 0 | false |
| IRS990/ExpenseAmt | 0 | 571280626 |
| IRS990/FamilyOrBusinessRlnInd | 0 | false |
| IRS990/FederalGrantAuditRequiredInd | 0 | false |
| IRS990/FeesForServicesOtherGrp/FundraisingAmt | 0 | 0 |
| IRS990/FeesForServicesOtherGrp/ManagementAndGeneralAmt | 0 | 3404744 |
| IRS990/FeesForServicesOtherGrp/ProgramServicesAmt | 0 | 40818542 |
| IRS990/FeesForServicesOtherGrp/TotalAmt | 0 | 44223286 |
| IRS990/ForeignActivitiesInd | 0 | false |
| IRS990/ForeignFinancialAccountInd | 0 | false |
| IRS990/ForeignOfficeInd | 0 | false |
| IRS990/Form8282PropertyDisposedOfInd | 0 | false |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 0 | 43.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 1 | 43.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 2 | 43.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 3 | 43.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 4 | 43.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 5 | 3.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 6 | 42.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 7 | 43.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 8 | 43.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 9 | 42.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRltdOrgRt | 15 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 0 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 1 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 2 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 3 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 4 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 5 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 6 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 7 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 8 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 9 | 1.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 10 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 11 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 12 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 13 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 14 | 40.0 |
| IRS990/Form990PartVIISectionAGrp/AverageHoursPerWeekRt | 15 | 0.0 |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 0 | Sister Diane Marie McGrew OSF |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 1 | Sister Judith Ann Duvall OSF |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 2 | Robert C Sehring |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 3 | Sister Theresa Ann Brazeau OSF |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 4 | Sister Agnes Joseph Williams OSF |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 5 | Brian Silverstein MD |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 6 | Gerald J McShane MD |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 7 | Sister M Mikela Meidl FSGM |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 8 | Sister Rose Therese Mann OSF |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 9 | Michael M Allen |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 10 | Daniel R Fassett MD |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 11 | Jeffrey R Klopfenstein MD |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 12 | Andrew J Tsung MD |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 13 | David G Cable MD |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 14 | Dzung H Dinh MD |
| IRS990/Form990PartVIISectionAGrp/BusinessName/BusinessNameLine1Txt | 15 | Kevin D Schoeplein |
| IRS990/Form990PartVIISectionAGrp/FormerOfcrDirectorTrusteeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/HighestCompensatedEmployeeInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 6 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 7 | X |
| IRS990/Form990PartVIISectionAGrp/IndividualTrusteeOrDirectorInd | 8 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 0 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 1 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 2 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 3 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 4 | X |
| IRS990/Form990PartVIISectionAGrp/OfficerInd | 5 | X |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 2 | 67133 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 6 | 75243 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 9 | 60528 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 10 | 36339 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 11 | 43894 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 12 | 51463 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 13 | 52704 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 14 | 60324 |
| IRS990/Form990PartVIISectionAGrp/OtherCompensationAmt | 15 | 42655 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 0 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 1 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 2 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 3 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 4 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 5 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 6 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 9 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 10 | 1881927 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 11 | 1653381 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 12 | 1469137 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 13 | 1209434 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 14 | 1106021 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromOrgAmt | 15 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 0 | 5280 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 1 | 5280 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 2 | 1660098 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 3 | 5280 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 4 | 5280 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 5 | 45000 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 6 | 382453 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 7 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 8 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 9 | 783568 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 10 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 11 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 12 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 13 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 14 | 0 |
| IRS990/Form990PartVIISectionAGrp/ReportableCompFromRltdOrgAmt | 15 | 2850403 |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 0 | President and Treasurer |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 1 | Chairperson |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 2 | Vice Chairperson CEO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 3 | Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 4 | Assistant Secretary |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 5 | Board Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 6 | Board Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 7 | Board Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 8 | Board Member |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 9 | CFO |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 10 | Physician |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 11 | Physician |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 12 | Physician |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 13 | Physician |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 14 | Physician |
| IRS990/Form990PartVIISectionAGrp/TitleTxt | 15 | Former - Vice Chairperson CEO |
| IRS990/Form990ProvidedToGvrnBodyInd | 0 | true |
| IRS990/FormationYr | 0 | 2011 |
| IRS990/FormerOfcrEmployeesListedInd | 0 | true |
| IRS990/FSAuditedBasisGrp/ConsolidatedBasisFinclStmtInd | 0 | X |
| IRS990/FSAuditedInd | 0 | true |
| IRS990/FundraisingActivitiesInd | 0 | false |
| IRS990/GainOrLossGrp/OtherAmt | 0 | 0 |
| IRS990/GainOrLossGrp/SecuritiesAmt | 0 | 0 |
| IRS990/GamingActivitiesInd | 0 | false |
| IRS990/GoverningBodyVotingMembersCnt | 0 | 9 |
| IRS990/GovernmentGrantsAmt | 0 | 119770 |
| IRS990/GrantAmt | 0 | 0 |
| IRS990/GrantsToIndividualsInd | 0 | false |
| IRS990/GrantsToOrganizationsInd | 0 | false |
| IRS990/GrantToRelatedPersonInd | 0 | false |
| IRS990/GrossReceiptsAmt | 0 | 364183670 |
| IRS990/GrossRentsGrp/RealAmt | 0 | 75059 |
| IRS990/GroupReturnForAffiliatesInd | 0 | false |
| IRS990/IncludeFIN48FootnoteInd | 0 | true |
| IRS990/IndependentAuditFinclStmtInd | 0 | false |
| IRS990/IndependentVotingMemberCnt | 0 | 7 |
| IRS990/IndivRcvdGreaterThan100KCnt | 0 | 821 |
| IRS990/IndoorTanningServicesInd | 0 | false |
| IRS990/InfoInScheduleOPartVIInd | 0 | X |
| IRS990/InfoInScheduleOPartXIInd | 0 | X |
| IRS990/InformationTechnologyGrp/ManagementAndGeneralAmt | 0 | 45168 |
| IRS990/InformationTechnologyGrp/ProgramServicesAmt | 0 | 140974 |
| IRS990/InformationTechnologyGrp/TotalAmt | 0 | 186142 |
| IRS990/InsuranceGrp/ManagementAndGeneralAmt | 0 | 109613 |
| IRS990/InsuranceGrp/ProgramServicesAmt | 0 | 7152283 |
| IRS990/InsuranceGrp/TotalAmt | 0 | 7261896 |
| IRS990/InventoriesForSaleOrUseGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentIncomeGrp/ExclusionAmt | 0 | 160172 |
| IRS990/InvestmentIncomeGrp/TotalRevenueColumnAmt | 0 | 160172 |
| IRS990/InvestmentInJointVentureInd | 0 | false |
| IRS990/InvestmentsOtherSecuritiesGrp/BOYAmt | 0 | 0 |
| IRS990/InvestmentsProgramRelatedGrp/BOYAmt | 0 | 0 |
| IRS990/IRPDocumentCnt | 0 | 160 |
| IRS990/IRPDocumentW2GCnt | 0 | 0 |
| IRS990/LandBldgEquipAccumDeprecAmt | 0 | 48845718 |
| IRS990/LandBldgEquipBasisNetGrp/BOYAmt | 0 | 30927988 |
| IRS990/LandBldgEquipBasisNetGrp/EOYAmt | 0 | 40595994 |
| IRS990/LandBldgEquipCostOrOtherBssAmt | 0 | 89441712 |
| IRS990/LegalDomicileStateCd | 0 | IL |
| IRS990/LessRentalExpensesGrp/RealAmt | 0 | 0 |
| IRS990/LoanOutstandingInd | 0 | false |
| IRS990/LoansFromOfficersDirectorsGrp/EOYAmt | 0 | 0 |
| IRS990/LobbyingActivitiesInd | 0 | false |
| IRS990/LocalChaptersInd | 0 | false |
| IRS990/MaterialDiversionOrMisuseInd | 0 | false |
| IRS990/MembersOrStockholdersInd | 0 | true |
| IRS990/MethodOfAccountingAccrualInd | 0 | X |
| IRS990/MinutesOfCommitteesInd | 0 | true |
| 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 SUPPORT THE MISSION OF OSF HEALTHCARE SYSTEM, A CATHOLIC INTEGRATED HEALTH CARE DELIVERY SYSTEM, THROUGH THE PROVISIONS OF QUALITY HEALTH CARE SERVICES TO COMPREHENSIVE INPATIENT AND OUTPATIENT CARE. |
| IRS990/MoreThan5000KToIndividualsInd | 0 | false |
| IRS990/MoreThan5000KToOrgInd | 0 | false |
| IRS990/NetAssetsOrFundBalancesBOYAmt | 0 | -7164677 |
| IRS990/NetAssetsOrFundBalancesEOYAmt | 0 | -1062116 |
| IRS990/NetRentalIncomeOrLossGrp/ExclusionAmt | 0 | 75059 |
| IRS990/NetRentalIncomeOrLossGrp/TotalRevenueColumnAmt | 0 | 75059 |
| IRS990/NetUnrelatedBusTxblIncmAmt | 0 | 0 |
| IRS990/NondeductibleContributionsInd | 0 | false |
| IRS990/OccupancyGrp/ManagementAndGeneralAmt | 0 | 319636 |
| IRS990/OccupancyGrp/ProgramServicesAmt | 0 | 2263171 |
| IRS990/OccupancyGrp/TotalAmt | 0 | 2582807 |
| IRS990/OfficeExpensesGrp/ManagementAndGeneralAmt | 0 | 863125 |
| IRS990/OfficeExpensesGrp/ProgramServicesAmt | 0 | 1765318 |
| IRS990/OfficeExpensesGrp/TotalAmt | 0 | 2628443 |
| IRS990/OfficerMailingAddressInd | 0 | true |
| IRS990/OperateHospitalInd | 0 | false |
| IRS990/Organization501c3Ind | 0 | X |
| IRS990/OrganizationFollowsSFAS117Ind | 0 | X |
| IRS990/OtherAssetsTotalGrp/BOYAmt | 0 | 2391328 |
| IRS990/OtherAssetsTotalGrp/EOYAmt | 0 | 1920101 |
| IRS990/OtherChangesInNetAssetsAmt | 0 | 296630207 |
| IRS990/OtherEmployeeBenefitsGrp/ManagementAndGeneralAmt | 0 | 8954987 |
| IRS990/OtherEmployeeBenefitsGrp/ProgramServicesAmt | 0 | 31972743 |
| IRS990/OtherEmployeeBenefitsGrp/TotalAmt | 0 | 40927730 |
| IRS990/OtherExpensesGrp/Desc | 0 | MEDICAL SUPPLIES |
| IRS990/OtherExpensesGrp/Desc | 1 | EQUIP RENTAL AND MAINT |
| IRS990/OtherExpensesGrp/Desc | 2 | BAD DEBT |
| IRS990/OtherExpensesGrp/Desc | 3 | CORPORATE OFFICE FEES |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 0 | 404795 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 1 | 4269079 |
| IRS990/OtherExpensesGrp/ManagementAndGeneralAmt | 2 | 6308754 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 0 | 26653502 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 1 | 32272183 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 2 | 20909029 |
| IRS990/OtherExpensesGrp/ProgramServicesAmt | 3 | 4335227 |
| IRS990/OtherExpensesGrp/TotalAmt | 0 | 27058297 |
| IRS990/OtherExpensesGrp/TotalAmt | 1 | 36541262 |
| IRS990/OtherExpensesGrp/TotalAmt | 2 | 20909029 |
| IRS990/OtherExpensesGrp/TotalAmt | 3 | 10643981 |
| IRS990/OtherLiabilitiesGrp/BOYAmt | 0 | 2968180 |
| IRS990/OtherLiabilitiesGrp/EOYAmt | 0 | 2135078 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 0 | 622110 |
| IRS990/OtherRevenueMiscGrp/BusinessCd | 1 | 621300 |
| IRS990/OtherRevenueMiscGrp/Desc | 0 | CONTRACTED MEDICAL PROFESSIONALS |
| IRS990/OtherRevenueMiscGrp/Desc | 1 | MEANINGFUL USE |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 0 | 663432 |
| IRS990/OtherRevenueMiscGrp/RelatedOrExemptFuncIncomeAmt | 1 | 195500 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 0 | 663432 |
| IRS990/OtherRevenueMiscGrp/TotalRevenueColumnAmt | 1 | 195500 |
| IRS990/OtherRevenueTotalAmt | 0 | 858932 |
| IRS990/OtherSalariesAndWagesGrp/ManagementAndGeneralAmt | 0 | 44350437 |
| IRS990/OtherSalariesAndWagesGrp/ProgramServicesAmt | 0 | 358044475 |
| IRS990/OtherSalariesAndWagesGrp/TotalAmt | 0 | 402394912 |
| IRS990/PartialLiquidationInd | 0 | false |
| IRS990/PayPremiumsPrsnlBnftCntrctInd | 0 | false |
| IRS990/PayrollTaxesGrp/ManagementAndGeneralAmt | 0 | 4821581 |
| IRS990/PayrollTaxesGrp/ProgramServicesAmt | 0 | 17214895 |
| IRS990/PayrollTaxesGrp/TotalAmt | 0 | 22036476 |
| IRS990/PensionPlanContributionsGrp/ManagementAndGeneralAmt | 0 | 3675983 |
| IRS990/PensionPlanContributionsGrp/ProgramServicesAmt | 0 | 13124672 |
| IRS990/PensionPlanContributionsGrp/TotalAmt | 0 | 16800655 |
| IRS990/PoliticalCampaignActyInd | 0 | false |
| IRS990/PrincipalOfcrBusinessName/BusinessNameLine1Txt | 0 | Michael M Allen |
| IRS990/ProfessionalFundraisingInd | 0 | false |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 0 | 622110 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 1 | 622110 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 2 | 622110 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 3 | 611430 |
| IRS990/ProgramServiceRevenueGrp/BusinessCd | 4 | 541700 |
| IRS990/ProgramServiceRevenueGrp/Desc | 0 | NET PATIENT SERVICE REVENUE |
| IRS990/ProgramServiceRevenueGrp/Desc | 1 | MANAGED CARE FEES |
| IRS990/ProgramServiceRevenueGrp/Desc | 2 | MEDICAL SERVICES |
| IRS990/ProgramServiceRevenueGrp/Desc | 3 | MEDICAL DIRECTORSHIPS |
| IRS990/ProgramServiceRevenueGrp/Desc | 4 | RESEARCH |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 0 | 357933750 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 1 | 2186823 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 2 | 1624044 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 3 | 986105 |
| IRS990/ProgramServiceRevenueGrp/RelatedOrExemptFuncIncomeAmt | 4 | 229015 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 0 | 357933750 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 1 | 2186823 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 2 | 1624044 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 3 | 986105 |
| IRS990/ProgramServiceRevenueGrp/TotalRevenueColumnAmt | 4 | 229015 |
| IRS990/ProhibitedTaxShelterTransInd | 0 | false |
| IRS990/PYExcessBenefitTransInd | 0 | false |
| IRS990/PYInvestmentIncomeAmt | 0 | 567239 |
| IRS990/PYOtherExpensesAmt | 0 | 146042674 |
| IRS990/PYOtherRevenueAmt | 0 | 1354869 |
| IRS990/PYProgramServiceRevenueAmt | 0 | 308739681 |