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Related Party Transactions (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 29, 2004 | Jun. 30, 2014 | May 07, 2012 | Oct. 02, 2013 | Jan. 31, 2014 | Oct. 02, 2013 | Dec. 06, 2013 | Aug. 24, 2012 | Oct. 31, 2013 | Oct. 24, 2004
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash investment segment contribution | $ 0 iep_Noncashinvestmentsegmentcontribution | $ 185,000,000 iep_Noncashinvestmentsegmentcontribution | $ 0 iep_Noncashinvestmentsegmentcontribution |  |  |  |  |  |  |  |  |  |
Payments to Acquire Interest in Joint Venture | 0 us-gaap_PaymentsToAcquireInterestInJointVenture | 279,000,000 us-gaap_PaymentsToAcquireInterestInJointVenture | 0 us-gaap_PaymentsToAcquireInterestInJointVenture |  |  |  |  |  |  |  |  |  |
Insight Portfolio Group LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | 2,000,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_InsightPortfolioGroupLLCMember | 2,000,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_InsightPortfolioGroupLLCMember |  |  |  |  |  |  |  |  |  |  |
Icahn Capital [Member] | Investment Funds [Member] | Expense Sharing Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses charged by related party | 155,000,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / dei_LegalEntityAxis = iep_IcahnCapitalMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_InvestmentFundsMember / iep_RelatedPartyTransactionsByTransactionTypeAxis = iep_ExpenseSharingAgreementMember | 113,000,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / dei_LegalEntityAxis = iep_IcahnCapitalMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_InvestmentFundsMember / iep_RelatedPartyTransactionsByTransactionTypeAxis = iep_ExpenseSharingAgreementMember | 23,000,000 us-gaap_RelatedPartyTransactionAmountsOfTransaction / dei_LegalEntityAxis = iep_IcahnCapitalMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_InvestmentFundsMember / iep_RelatedPartyTransactionsByTransactionTypeAxis = iep_ExpenseSharingAgreementMember |  |  |  |  |  |  |  |  |  |
Federal-Mogul [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in subsidiary | 80.70%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / dei_LegalEntityAxis = iep_FederalMogulMember |  |  |  |  |  |  |  |  |  |  |  |
Federal-Mogul [Member] | Principal Owners and Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Funding Commitment, Total Amount |  |  |  |  |  |  |  |  |  | 1,600,000,000 iep_FundingCommitmentTotalAmount / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |
IEP Energy [Member] | Principal Owners and Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions by non-controlling interests in subsidiary (Shares) |  |  |  |  |  | 4,566,546 iep_Otherownershipinterestsshares / dei_LegalEntityAxis = iep_IepEnergyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  | 3,288,371 iep_Otherownershipinterestsshares / dei_LegalEntityAxis = iep_IepEnergyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |
Capital contributions by non-controlling interests in subsidiary |  |  |  |  |  | 137,000,000 iep_OtherOwnershipInterestValue / dei_LegalEntityAxis = iep_IepEnergyMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  |  |  |
ARL [Member] | Principal Owners and Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and Leases Receivable, Related Parties |  |  |  |  |  |  |  |  |  |  |  | 171,000,000 us-gaap_LoansAndLeasesReceivableRelatedParties / dei_LegalEntityAxis = iep_ArlMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember | 165,000,000 us-gaap_LoansAndLeasesReceivableRelatedParties / dei_LegalEntityAxis = iep_ArlMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember
Interest Income, Related Party |  | 6,000,000 us-gaap_InterestIncomeRelatedParty / dei_LegalEntityAxis = iep_ArlMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember | 8,000,000 us-gaap_InterestIncomeRelatedParty / dei_LegalEntityAxis = iep_ArlMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Rate |  |  |  | 1.75%us-gaap_RelatedPartyTransactionRate / dei_LegalEntityAxis = iep_ArlMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  |  |  |  |  |
Investment Funds [Member] | Principal Owners and Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in funds | 500,000,000 iep_InvestmentInFunds / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember | 45,000,000 iep_InvestmentInFunds / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  |  |  |  |  |  |  |
Investments, fair value | 4,800,000,000 us-gaap_InvestmentsFairValueDisclosure / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember | 4,700,000,000 us-gaap_InvestmentsFairValueDisclosure / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  |  |  |  |  |  |  |
Percentage fair value of investments in Funds that is attributable to Mr. Icahn | 53.00%iep_PercentagefairvalueofinvestmentsinFundsthatisattributabletoMr.Icahn / dei_LegalEntityAxis = iep_InvestmentFundsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_PrincipalOwnersAndAffiliatesMember | 56.00%iep_PercentagefairvalueofinvestmentsinFundsthatisattributabletoMr.Icahn / dei_LegalEntityAxis = iep_InvestmentFundsMember / 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 |  |  |  |  |  |  |  |  |  |  |  |
AEP Leasing [Member] | ACF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Option to purchase additinal railcars, number of cars | 500 iep_Optiontopurchaseadditinalrailcarsnumberofcars / dei_LegalEntityAxis = iep_AEPLeasingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  |  |  |  |  |  |  |  |  |  |
Option to purchase additional railcars | 70,000,000 iep_Optiontopurchaseadditionalrailcars / dei_LegalEntityAxis = iep_AEPLeasingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  |  |  |  |  |  |  |  |  |  |
Railcars purchased |  |  |  |  | 296 iep_Railcarspurchased / dei_LegalEntityAxis = iep_AEPLeasingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  |  |  |  |  |  |
Purchase price of railcars |  |  |  |  | 43,000,000 iep_Purchasepriceofrailcars / dei_LegalEntityAxis = iep_AEPLeasingMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  |  |  |  |  |  |
Principal Owners and Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises | 88.40%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / iep_MembersOrPartnersAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  |  |  |  |  |  |  |  |
Principal Owners and Affiliates [Member] | IEP Energy [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises |  |  |  |  |  | 6.40%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / dei_LegalEntityAxis = iep_IepEnergyMember / iep_MembersOrPartnersAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  |  |  |
Railcar Sales [Member] | ARI [Member] | ACF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Other Revenues from Transactions with Related Party | 19,000,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_AriMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember | 12,000,000 us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_AriMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  |  |  |  |  |  |  |  |  |
Railcar Sales [Member] | AEP Leasing [Member] | ACF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party | 127,000,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_AEPLeasingMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember | 57,000,000 us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = iep_AEPLeasingMember / us-gaap_RelatedPartyTransactionAxis = iep_RailcarSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  |  |  |  |  |  |  |  |  |
Purchase of railcars [Member] | AEP Leasing [Member] | ACF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required | 1,050 us-gaap_UnrecordedUnconditionalPurchaseObligationMinimumQuantityRequired / dei_LegalEntityAxis = iep_AEPLeasingMember / us-gaap_RelatedPartyTransactionAxis = iep_PurchaseofrailcarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  |  |  |  |  |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation | 150,000,000 us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = iep_AEPLeasingMember / us-gaap_RelatedPartyTransactionAxis = iep_PurchaseofrailcarsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_AcfMember |  |  |  |  |  |  |  |  |  |  |  |
Investment Segment [Member] | Koala [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash Investment segment contribution (derivative liability shares transferred) |  | 7,700,000 iep_NoncashInvestmentsegmentcontributionderivativeliabilitysharestransferred / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_KoalaMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  |  |  |  |  |  |  |  |  |  |
Non-cash investment segment contribution |  | 185,000,000 iep_Noncashinvestmentsegmentcontribution / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = iep_KoalaMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  |  |  |  |  |  |  |  |  |  |
Railcar Segment [Member] | American Entertainment Properties Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid for management contract between related parties |  |  |  |  |  |  | 21,000,000 iep_Amountpaidformanagementcontractbetweenrelatedparties / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |
Payments to Acquire Interest in Joint Venture |  |  |  |  |  |  | 279,000,000 us-gaap_PaymentsToAcquireInterestInJointVenture / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |
Railcar Segment [Member] | ARL [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash contribution to newly capitalized entity |  |  |  |  |  |  | 71,000,000 iep_Cashcontributiontonewlycapitalizedentity / dei_LegalEntityAxis = iep_ArlMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |
Note receivable contribution to newly capitalized entity |  |  |  |  |  |  | 171,000,000 iep_Notereceivablecontributiontonewlycapitalizedentity / dei_LegalEntityAxis = iep_ArlMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |
Additional debt incurred by newly capitalized entity |  |  |  |  |  |  |  | 381,000,000 iep_Additionaldebtincurredbynewlycapitalizedentity / dei_LegalEntityAxis = iep_ArlMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |
Cash distributed by newly capitalized entity |  |  |  |  |  |  |  | $ 381,000,000 iep_Cashdistributedbynewlycapitalizedentity / dei_LegalEntityAxis = iep_ArlMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |
Railcar Segment [Member] | New ARL [Member] [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in subsidiary |  |  |  |  |  |  |  |  | 75.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest / dei_LegalEntityAxis = iep_NewARLMemberMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |

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