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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	$ 182us-gaap_OtherNonoperatingIncomeExpense	$ 21us-gaap_OtherNonoperatingIncomeExpense	$ (175)us-gaap_OtherNonoperatingIncomeExpense
Loss on extinguishment of debt	(162)us-gaap_GainsLossesOnExtinguishmentOfDebt	0us-gaap_GainsLossesOnExtinguishmentOfDebt	(10)us-gaap_GainsLossesOnExtinguishmentOfDebt
Railcar Segment [Member]
Debt Instrument [Line Items]
Other income (loss), net	16us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	(6)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	0us-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	0us-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				2us-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												275us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_ARI2007NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Repayments of debt					175us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARI2007NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	100us-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							106us-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							110us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Use of portion of debt proceeds to repay other debt								256iep_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													98iep_DrawOnTermLoanInitialDraw / us-gaap_DebtInstrumentAxis = iep_OriginalARITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Gross proceeds from sale of senior unsecured notes	100us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / us-gaap_DebtInstrumentAxis = iep_OriginalARITermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Long-term Debt	195us-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									316us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Use of portion of debt proceeds to repay other debt									194iep_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									122iep_ProceedsfromissuanceofLongtermdebtafterproceedsusedtorefinancepriordebt / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Interest reserve amount	4iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	4iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Additional borrowing availability									100iep_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	277us-gaap_PledgedAssetsNotSeparatelyReportedOnStatementOfFinancialPosition / us-gaap_DebtInstrumentAxis = iep_LeaseFleetFinancingsMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	217us-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																	40us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_ARLSovereignRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Line of credit facility														120us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_ARLSovereignRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	130us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_ARLSovereignRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	110us-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		47us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Line of Credit Facility, Current Borrowing Capacity										250us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Line of credit facility		73us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember								350us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Additional borrowing availability										100iep_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																		175us-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									250us-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									135us-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																			300us-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																				12us-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																					375us-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																		150us-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																						47us-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																						15us-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											626us-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											376us-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											$ 250us-gaap_ProceedsFromIssuanceOfPrivatePlacement / us-gaap_DebtInstrumentAxis = iep_ClassA1NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / us-gaap_SubsequentEventTypeAxis = iep_DebtfinancingMember

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Additional borrowing availability

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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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

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-Section 45

-Paragraph 14

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-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585



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