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v2.4.1.9

Related Party Transactions (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Mr. Icahn and his affiliates [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Investment in funds | $ 245,000,000 iep_InvestmentInFunds / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |
Icahn Capital [Member] | Expense sharing agreement [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses charged by related party | 98,000,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / dei_LegalEntityAxis = iep_IcahnCapitalMember / us-gaap_RelatedPartyTransactionAxis = iep_ExpenseSharingAgreementMember | 16,000,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / dei_LegalEntityAxis = iep_IcahnCapitalMember / us-gaap_RelatedPartyTransactionAxis = iep_ExpenseSharingAgreementMember |
Investment Funds [Member] | Mr. Icahn and his affiliates [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage fair value of investments in Funds that is attributable to Mr. Icahn | 54.00%iep_PercentagefairvalueofinvestmentsinFundsthatisattributabletoMr.Icahn / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  | 53.00%iep_PercentagefairvalueofinvestmentsinFundsthatisattributabletoMr.Icahn / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember
Investment Funds [Member] | Mr. Icahn and his affiliates [Member] | Investment in Funds [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related party transaction, balance | 5,200,000,000 iep_RelatedPartyTransactionBalance / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionAxis = us-gaap_HedgeFundsEquityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  | 4,800,000,000 iep_RelatedPartyTransactionBalance / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionAxis = us-gaap_HedgeFundsEquityMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember
ARI [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of equity ownership in subsidiary | 55.60%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / dei_LegalEntityAxis = iep_AriMember |  |
ARL [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of equity ownership in subsidiary | 75.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / dei_LegalEntityAxis = iep_ArlMember |  |
ARL [Member] | ACF [Member] | Railcar Sales [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related party | 5,000,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_ArlMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |
Agreements with ACF [Member] | ARI [Member] | ACF [Member] | Railcar Sales [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues from transactions with related party | 2,000,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_AriMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember | 6,000,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_AriMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |
Agreements with ACF [Member] | AEP Leasing [Member] | ACF [Member] | Purchase of railcars [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Unrecorded unconditional purchase obligation, minimum quantity required | 1,050 us-gaap_UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired / dei_LegalEntityAxis = iep_AEPLeasingMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_PurchaseofrailcarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |
Unrecorded unconditional purchase obligation | 150,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = iep_AEPLeasingMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_PurchaseofrailcarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |
Option to purchase additinal railcars, number of cars | 500 iep_Optiontopurchaseadditinalrailcarsnumberofcars / dei_LegalEntityAxis = iep_AEPLeasingMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_PurchaseofrailcarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |
Option to purchase additional railcars | 70,000,000 iep_Optiontopurchaseadditionalrailcars / dei_LegalEntityAxis = iep_AEPLeasingMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_PurchaseofrailcarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |
Option exercised to purchase additinal railcars, number of cars | 296 iep_Optionexercisedtopurchaseadditinalrailcarsnumberofcars / dei_LegalEntityAxis = iep_AEPLeasingMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_PurchaseofrailcarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |
Option exercised to purchase additional railcars | 42,000,000 iep_Optionexercisedtopurchaseadditionalrailcars / dei_LegalEntityAxis = iep_AEPLeasingMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_PurchaseofrailcarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |
Agreements with ACF [Member] | ARL [Member] | ACF [Member] | Railcar Sales [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Expenses from transactions with related party | $ 9,000,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_ArlMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember | $ 28,000,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_ArlMember / iep_RelatedpartyagreementAxis = iep_AgreementswithACFMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |

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