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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 | $ 182,000,000 us-gaap_OtherNonoperatingIncomeExpense | $ 21,000,000 us-gaap_OtherNonoperatingIncomeExpense | $ (175,000,000)us-gaap_OtherNonoperatingIncomeExpense |  |
Amortization of Financing Costs and Discounts | 22,000,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 34,000,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 28,000,000 us-gaap_AmortizationOfFinancingCostsAndDiscounts |  |
Loss on extinguishment of debt | 162,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | 10,000,000 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |
Railcar Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other income (loss), net | 16,000,000 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | (6,000,000)us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 0 us-gaap_OtherNonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |
Railcar Segment [Member] | ARI Refinanced Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest reserve amount | 4,000,000 iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember | 4,000,000 iep_Interestreserveamount / us-gaap_DebtInstrumentAxis = iep_ARIRefinancedTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |
Gaming Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Other income (loss), net | 88,000,000 us-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 |  |  |  |  | 300,000,000 us-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 | 172,000,000 iep_UseOfPortionOfDebtProceeds / us-gaap_DebtInstrumentAxis = iep_TropicanaTermLoanFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |  |  |
Amortization of Financing Costs and Discounts | 750,000 us-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 |  |  |  |  | 15,000,000 iep_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 | 15,000,000 us-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 | 0 us-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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