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Debt Narrative - Credit Facilities - Gaming (Details) (USD $)	12 Months Ended			9 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Nov. 27, 2013
Debt Instrument [Line Items]
Other income (loss), net	$ 182,000,000us-gaap_OtherNonoperatingIncomeExpense	$ 21,000,000us-gaap_OtherNonoperatingIncomeExpense	$ (175,000,000)us-gaap_OtherNonoperatingIncomeExpense
Amortization of Financing Costs and Discounts	22,000,000us-gaap_AmortizationOfFinancingCostsAndDiscounts	34,000,000us-gaap_AmortizationOfFinancingCostsAndDiscounts	28,000,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
Loss on extinguishment of debt	162,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt	0us-gaap_GainsLossesOnExtinguishmentOfDebt	10,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt
Railcar Segment [Member]
Debt Instrument [Line Items]
Other income (loss), net	16,000,000us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	(6,000,000)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	0us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Railcar Segment [Member] | ARI Refinanced Term Loan [Member]
Debt Instrument [Line Items]
Interest reserve amount	4,000,000iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember	4,000,000iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Gaming Segment [Member]
Debt Instrument [Line Items]
Other income (loss), net	88,000,000us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember	(5,000,000)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember	(3,000,000)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Gaming Segment [Member] | Tropicana Term Loan Facility [Member]
Debt Instrument [Line Items]
Term Loan Facility					300,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_TropicanaTermLoanFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Debt discount rate at time of issuance					0.50%iep_Debtdiscountrateattimeofissuance / us-gaap_DebtInstrumentAxis = iep_TropicanaTermLoanFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Use of portion of debt proceeds	172,000,000iep_UseOfPortionOfDebtProceeds / us-gaap_DebtInstrumentAxis = iep_TropicanaTermLoanFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Amortization of Financing Costs and Discounts	750,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = iep_TropicanaTermLoanFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Gaming Segment [Member] | Tropicana Revolving Facility [Member]
Debt Instrument [Line Items]
Letter of credit facility, maximum aggregate amount					15,000,000iep_LetterOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_TropicanaRevolvingFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Term Loan [Member] | Gaming Segment [Member]
Debt Instrument [Line Items]
Trailing Months Used to Calculate Leverage Ratios	12 years
Tropicana Term Loan Facility [Member] | Gaming Segment [Member]
Debt Instrument [Line Items]
Interest rate, long-term debt	4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = iep_TropicanaTermLoanFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Tropicana Revolving Facility [Member] | Gaming Segment [Member]
Debt Instrument [Line Items]
Term Loan Facility	15,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_CreditFacilityAxis = iep_TropicanaRevolvingFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Loss on extinguishment of debt (Note 10)
Debt Instrument [Line Items]
Other income (loss), net	(162,000,000)us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember	0us-gaap_OtherNonoperatingIncomeExpense / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember	(10,000,000)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				(2,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember
Loss on extinguishment of debt (Note 10) | Gaming Segment [Member] | Tropicana Term Loan Facility [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ (5,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / iep_ComponentOfOtherIncomeLossNetAxis = iep_LossOnDebtExtinguishmentMember / us-gaap_DebtInstrumentAxis = iep_TropicanaTermLoanFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember

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