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Debt Narrative - Senior Unsecured Notes and Secured Term Loan Facility - Railcar (Details) (USD $) | 3 Months Ended | 1 Months Ended | 0 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jan. 31, 2015 | Feb. 28, 2014 | Mar. 31, 2014 | Jan. 31, 2014 | Oct. 01, 2014 | Dec. 19, 2014 | Sep. 30, 2014 | Mar. 27, 2014 | Dec. 12, 2012 | Dec. 31, 2014 | Jun. 23, 2014 | Sep. 03, 2014 | Sep. 26, 2014 | Jun. 25, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ 2,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 126,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Increase (Decrease) |  |  | 5.00%us-gaap_DebtInstrumentInterestRateIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Future debt expected to be incurred by new capitalized entity |  |  |  | 381,000,000 iep_Futuredebtexpectedtobeincurredbynewcapitalizedentity / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  | 626,000,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from (Repayments of) Debt |  |  | 212,000,000 us-gaap_ProceedsFromRepaymentsOfDebt / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | NCF I Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  | 250,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_NCFITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | NCF II Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  | 135,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_NCFIITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt |  |  |  |  |  | 3.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_NCFIITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | RCF Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  | 300,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_RCFTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |
Use of portion of debt proceeds |  | 156,000,000 iep_UseOfPortionOfDebtProceeds / us-gaap_DebtInstrumentAxis = iep_RCFTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | Class A-1 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  | 110,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |
Interest rate, long-term debt |  |  | 2.98%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Use of portion of debt proceeds to repay other debt |  |  |  |  | 256,000,000 iep_Useofportionofdebtproceedstorepayotherdebt / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  | 250,000,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | Class A-2 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  | 106,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_ClassA2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |
Interest rate, long-term debt | 3.81%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_ClassA2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  | 4.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_ClassA2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement |  |  | 376,000,000 us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_DebtInstrumentAxis = iep_ClassA2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | ARI Refinanced Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest reserve amount | 17,000,000 iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  | 309,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |
Proceeds from Issuance of Long-term Debt |  |  |  |  |  | 316,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |
Use of portion of debt proceeds to repay other debt |  |  |  |  |  | 194,000,000 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 |  |  |  |  |  | 122,000,000 iep_ProceedsfromissuanceofLongtermdebtafterproceedsusedtorefinancepriordebt / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | ARILL2TermLoan [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARILL2TermLoanDomain / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |
Proceeds from Issuance of Debt |  |  |  |  |  |  | 100,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_ARILL2TermLoanDomain / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | ARI 2015 Notes [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | 621,000,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARI2015NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | Lease Fleet Financings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pledged assets | 495,000,000 us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition / us-gaap_DebtInstrumentAxis = iep_LeaseFleetFinancingsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  | 277,000,000 us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition / us-gaap_DebtInstrumentAxis = iep_LeaseFleetFinancingsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |
Use of portion of debt proceeds |  | 409,000,000 iep_UseOfPortionOfDebtProceeds / us-gaap_DebtInstrumentAxis = iep_LeaseFleetFinancingsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | Citizen Bank Revolver [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility |  |  |  |  |  |  |  | 350,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |
Line of credit facility, outstanding borowings | 100,000,000 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility, maximum borrowing availability |  |  |  |  |  |  |  | 250,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |
Additional borrowing availability |  |  |  |  |  |  |  | 100,000,000 iep_Additionalborrowingavailability / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |
Railcar Segment [Member] | Heartland Bank Term Loan [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 12,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_HeartlandBankTermLoanMemberMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |
Railcar Segment [Member] | Credit Agricole Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  | 375,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_CreditAgricoleTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |
Railcar Segment [Member] | Banc of America Leasing & Capital, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_BancofAmericaLeasingCapitalLLCMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |
Railcar Segment [Member] | Talmer Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_TalmerBankMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |
Railcar Segment [Member] | Class 2014 A-1 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_Class2014A1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Interest rate, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.92%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_Class2014A1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Railcar Segment [Member] | Class 2014 A-2 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount issued, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_Class2014A2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Interest rate, long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.97%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_Class2014A2NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Railcar Segment [Member] | Term Loan [Member] | ARI Notes due 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest reserve amount |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARINotesdue2020Member / us-gaap_LongtermDebtTypeAxis = iep_TermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |
Loss on extinguishment of debt (Note 10) | Railcar Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ (2,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  | $ (2,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |
Minimum [Member] | Railcar Segment [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt | 3.35%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_TermLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Railcar Segment [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate, long-term debt | 6.95%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_TermLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Railcar Segment [Member] | NCF I Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = iep_NCFITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / iep_VariableRateOptionAxis = iep_LiborMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Railcar Segment [Member] | Class A-1 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / iep_VariableRateOptionAxis = iep_LiborMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Railcar Segment [Member] | Citizen Bank Revolver [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / iep_VariableRateOptionAxis = iep_LiborMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Railcar Segment [Member] | Credit Agricole Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = iep_CreditAgricoleTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / iep_VariableRateOptionAxis = iep_LiborMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Railcar Segment [Member] | Banc of America Leasing & Capital, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = iep_BancofAmericaLeasingCapitalLLCMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / iep_VariableRateOptionAxis = iep_LiborMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Railcar Segment [Member] | Talmer Bank [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = iep_TalmerBankMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / iep_VariableRateOptionAxis = iep_LiborMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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 Future debt expected to be incurred by new capitalized entity + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest reserve amount + References No definition available. + Details
Name: | iep_Interestreserveamount
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Proceeds from issuance of Long-term debt after proceeds used to refinance prior debt + References No definition available. + Details
Name: | iep_ProceedsfromissuanceofLongtermdebtafterproceedsusedtorefinancepriordebt
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Use of portion of debt proceeds + References No definition available. + Details
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- Definition Use of portion of debt proceeds to repay other debt + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Incremental percentage increase (decrease) in the stated rate on a debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow in aggregate debt due to repayments and proceeds from additional borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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