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Debt Narrative - Senior Unsecured Notes and Secured Term Loan Facility - Railcar (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 9 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2014 | Jan. 31, 2013 | Sep. 30, 2012 | Dec. 12, 2013 | Mar. 31, 2014 | Jan. 31, 2014 | Dec. 19, 2014 | Jan. 31, 2015 | Feb. 28, 2007 | Dec. 01, 2012 | Jul. 12, 2013 | Jun. 08, 2011 | Jan. 04, 2011 | Feb. 02, 2006 | Jun. 25, 2014 | Mar. 27, 2014 | Jun. 23, 2014 | Sep. 03, 2014 | Sep. 26, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (loss), net | $ 182 us-gaap_OtherNonoperatingIncomeExpense | $ 21 us-gaap_OtherNonoperatingIncomeExpense | $ (175)us-gaap_OtherNonoperatingIncomeExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | (162)us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | (10)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (loss), net | 16 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | (6)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 0 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt (Note 10) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (loss), net | (162)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember | 0 us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember | (10)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt (Note 10) | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 2 us-gaap_GainsLossesOnExtinguishmentOfDebt / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARI 2007 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  | 275 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_ARI2007NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | 175 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARI2007NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 100 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARI2007NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARI 2007 Notes [Member] | Loss on extinguishment of debt (Note 10) | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other income (loss), net |  | (1)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember / us-gaap_DebtInstrumentAxis = iep_ARI2007NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | (2)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember / us-gaap_DebtInstrumentAxis = iep_ARI2007NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A-2 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  | 106 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ClassA2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A-1 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  | 110 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Use of portion of debt proceeds to repay other debt |  |  |  |  |  |  |  | 256 iep_Useofportionofdebtproceedstorepayotherdebt / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original ARI Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Draw on term loan, initial draw |  |  |  |  |  |  |  |  |  |  |  |  | 98 iep_DrawOnTermLoanInitialDraw / us-gaap_DebtInstrumentAxis = iep_OriginalARITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |
Gross proceeds from sale of senior unsecured notes | 100 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / us-gaap_DebtInstrumentAxis = iep_OriginalARITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | 195 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = iep_OriginalARITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARI Refinanced Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  |  |  |  | 316 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Use of portion of debt proceeds to repay other debt |  |  |  |  |  |  |  |  | 194 iep_Useofportionofdebtproceedstorepayotherdebt / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of Long-term debt after proceeds used to refinance prior debt |  |  |  |  |  |  |  |  | 122 iep_ProceedsfromissuanceofLongtermdebtafterproceedsusedtorefinancepriordebt / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Interest reserve amount | 4 iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 4 iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing availability |  |  |  |  |  |  |  |  | 100 iep_Additionalborrowingavailability / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Lease Fleet Financings [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate assets pledged to collateralize mortgages | 277 us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition / us-gaap_DebtInstrumentAxis = iep_LeaseFleetFinancingsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 217 us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition / us-gaap_DebtInstrumentAxis = iep_LeaseFleetFinancingsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ARL Sovereign Revolver [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_ARLSovereignRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_ARLSovereignRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 130 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_ARLSovereignRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 110 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_ARLSovereignRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |
Citizen Bank Revolver [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  | 47 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  |  |  |  |  | 250 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  | 73 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  | 350 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing availability |  |  |  |  |  |  |  |  |  | 100 iep_Additionalborrowingavailability / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |
Class 2014 A-1 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_Class2014A1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |
NCF I Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  | 250 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_NCFITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
NCF II Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  | 135 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_NCFIITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
RCF Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_RCFTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |
Heartland Bank Term Loan [Member] [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_HeartlandBankTermLoanMemberMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |
Credit Agricole Term Loan [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 375 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_CreditAgricoleTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |
Class 2014 A-2 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_Class2014A2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |
Banc of America Leasing & Capital, LLC [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_BancofAmericaLeasingCapitalLLCMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Talmer Bank [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_TalmerBankMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Proceeds from debt [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  |  |  |  |  |  | 626 us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / us-gaap_SubsequentEventTypeAxis = iep_DebtfinancingMember |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt [Member] | Class A-2 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt |  |  |  |  |  |  |  |  |  |  | 4.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_ClassA2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / us-gaap_SubsequentEventTypeAxis = iep_DebtfinancingMember |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  |  |  |  |  |  | 376 us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_DebtInstrumentAxis = iep_ClassA2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / us-gaap_SubsequentEventTypeAxis = iep_DebtfinancingMember |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt [Member] | Class A-1 Notes [Member] | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt |  |  |  |  |  |  |  |  |  |  | 2.98%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / us-gaap_SubsequentEventTypeAxis = iep_DebtfinancingMember |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  |  |  |  |  |  |  |  |  | $ 250 us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / us-gaap_SubsequentEventTypeAxis = iep_DebtfinancingMember |  |  |  |  |  |  |  |  |  |  |

X
- Definition Additional borrowing availability + References No definition available. + Details
Name: | iep_Additionalborrowingavailability
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Draw on term loan + References No definition available. + Details
Name: | iep_DrawOnTermLoanInitialDraw
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Interest reserve amount + References No definition available. + Details
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