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Net Income Per LP Unit (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended |
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Nov. 30, 2013 | Jan. 20, 2012 | Dec. 09, 2013 | Jun. 12, 2013 | Feb. 28, 2013 | Dec. 27, 2011
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to Icahn Enterprises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (373)us-gaap_IncomeLossFromContinuingOperations | $ 1,025 us-gaap_IncomeLossFromContinuingOperations |  | $ 396 us-gaap_IncomeLossFromContinuingOperations |  |  |  |  |  |
Less: Net income attributable to Icahn Enterprises allocable to general partner(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 iep_NetIncomeFromContinuingOperationsAttributableToParentAllocatedToGeneralPartnerBeforeTraditionalParntershipAllocation | 0 iep_NetIncomeFromContinuingOperationsAttributableToParentAllocatedToGeneralPartnerBeforeTraditionalParntershipAllocation | [1] | (9)iep_NetIncomeFromContinuingOperationsAttributableToParentAllocatedToGeneralPartnerBeforeTraditionalParntershipAllocation |  |  |  |  |  |
Net (loss) income attributable to Icahn Enterprises net of portion allocable 100% to general partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (373)iep_NetIncomeFromContinuingOperationsAttributableToParentSubjectToAllocationAmongstPartners | 1,025 iep_NetIncomeFromContinuingOperationsAttributableToParentSubjectToAllocationAmongstPartners |  | 387 iep_NetIncomeFromContinuingOperationsAttributableToParentSubjectToAllocationAmongstPartners |  |  |  |  |  |
Limited partners |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (366)us-gaap_NetIncomeLossAllocatedToLimitedPartners | 1,005 us-gaap_NetIncomeLossAllocatedToLimitedPartners |  | 379 us-gaap_NetIncomeLossAllocatedToLimitedPartners |  |  |  |  |  |
Basic (loss) income per LP unit | $ (3.84)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [2] | $ (2.90)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [2] | $ 4.06 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [2] | $ (0.24)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [2] | $ 1.91 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [2] | $ 4.13 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [2] | $ 0.48 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [2] | $ 2.56 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | [2] | $ (3.08)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax | $ 9.14 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax |  | $ 3.72 us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax |  |  |  |  |  |
Basic weighted average LP units outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 110,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 102,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |  |  |  |  |
Dilutive securities, effect on earnings per unit from converison of debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 iep_DilutiveSecuritiesEffectOnEarningsPerUnitFromConverisonOfDebtSecurities |  | 0 iep_DilutiveSecuritiesEffectOnEarningsPerUnitFromConverisonOfDebtSecurities |  |  |  |  |  |
Dilutive effect of variable rate convertible notes, Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities |  | 0 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities |  |  |  |  |  |
Diluted (loss) income per LP unit | $ (3.84)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | [2] | $ (2.90)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | [2] | $ 4.06 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | [2] | $ (0.24)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | [2] | $ 1.90 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | [2] | $ 4.10 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | [2] | $ 0.48 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | [2] | $ 2.50 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | [2] | $ (3.08)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted | $ 9.07 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted |  | $ 3.72 us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted |  |  |  |  |  |
Diluted weighted average LP units outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 119,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 111,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 102,000,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |  |  |  |
Unit distribution liability | 0 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |  |  |  |  |  | 142 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |  |  |  |  |  | 0 us-gaap_DividendsPayableCurrentAndNoncurrent | 142 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |  |  |  |  |  |
Partnership contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ProceedsFromPartnershipContribution | 593 us-gaap_ProceedsFromPartnershipContribution |  | 513 us-gaap_ProceedsFromPartnershipContribution |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unit distribution declared per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.00 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember |  |  |  | $ 1.50 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember |  |  |  |  |
Units distributed to LP unitholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,203,105 us-gaap_DistributionMadeToLimitedPartnerUnitDistribution / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |
Depositary Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rights received per depositary unit held |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.15881 iep_RatioOfRightsPerDepositaryUnit / us-gaap_CapitalUnitsByClassAxis = iep_DepositaryUnitsMember
Rights' subscription price per depositary unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36.7933 iep_RightSubscriptionPricePerDepositaryUnit / us-gaap_CapitalUnitsByClassAxis = iep_DepositaryUnitsMember
Aggregate depositary units distributed in connection with rights offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,590,238 iep_AggregateDepositaryUnitsDistributedInConnectionWithRightsOffering / us-gaap_CapitalUnitsByClassAxis = iep_DepositaryUnitsMember |  |  |  |
Proceeds from rights offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 iep_ProceedsFromRightsOffering / us-gaap_CapitalUnitsByClassAxis = iep_DepositaryUnitsMember |  |  |  |
Icahn Enterprises G.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / iep_MembersOrPartnersAxis = iep_IcahnEnterprisesGPMember | 1.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / iep_MembersOrPartnersAxis = iep_IcahnEnterprisesGPMember |  |  |  |  |  |  |  |
Principal Owners and Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88.40%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest / iep_MembersOrPartnersAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |  |  |  |  |  |
Principal Owners and Affiliates [Member] | Depositary Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate depositary units distributed in connection with rights offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,995,584 iep_AggregateDepositaryUnitsDistributedInConnectionWithRightsOffering / us-gaap_CapitalUnitsByClassAxis = iep_DepositaryUnitsMember / iep_MembersOrPartnersAxis = iep_PrincipalOwnersAndAffiliatesMember |  |  |  |
Limited partners | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newly issued depositary units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember | 1,600,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember | 3,174,604 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember |
Equity issuance, per unit amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 135.00 iep_Equityissuanceperunitamount / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember | $ 75.54 iep_Equityissuanceperunitamount / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember | $ 63.00 iep_Equityissuanceperunitamount / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember |
Underwriter option to purchase additional depositary units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 iep_UnderwriterOptionToPurchaseAdditionalDepositaryUnits / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember | 240,000 iep_UnderwriterOptionToPurchaseAdditionalDepositaryUnits / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember | 476,191 iep_UnderwriterOptionToPurchaseAdditionalDepositaryUnits / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember |
Proceeds from Issuance or Sale of Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 581 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_CapitalUnitsByClassAxis = us-gaap_CommonStockMember / us-gaap_ShareholdersEquityClassAxis = us-gaap_LimitedPartnerMember |  |  |  |  |  |  |  |
General partner |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per LP Unit [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12 us-gaap_ProceedsFromPartnershipContribution / us-gaap_ShareholdersEquityClassAxis = us-gaap_GeneralPartnerMember |  |  |  |  |  |  |  |
[1] | Amount represents net income allocable to the general partner for the period May 5, 2012 through August 23, 2012, the period in which Mr. Icahn and his affiliates' ownership in IEP Energy, other than Icahn Enterprises' ownership, were considered under common control. On August 24, 2012, Mr. Icahn and his affiliates contributed this interest to us in exchange for our depositary units.
[2] | Basic and diluted (loss) income per LP unit is computed separately for each quarter and therefore, the sum of such quarterly per LP unit amounts may differ from the total for the year.

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