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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
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 $ 1,025us-gaap_IncomeLossFromContinuingOperations $ 396us-gaap_IncomeLossFromContinuingOperations            
Less: Net income attributable to Icahn Enterprises allocable to general partner(1)                 0iep_NetIncomeFromContinuingOperationsAttributableToParentAllocatedToGeneralPartnerBeforeTraditionalParntershipAllocation 0iep_NetIncomeFromContinuingOperationsAttributableToParentAllocatedToGeneralPartnerBeforeTraditionalParntershipAllocation [1] (9)iep_NetIncomeFromContinuingOperationsAttributableToParentAllocatedToGeneralPartnerBeforeTraditionalParntershipAllocation            
Net (loss) income attributable to Icahn Enterprises net of portion allocable 100% to general partner                 (373)iep_NetIncomeFromContinuingOperationsAttributableToParentSubjectToAllocationAmongstPartners 1,025iep_NetIncomeFromContinuingOperationsAttributableToParentSubjectToAllocationAmongstPartners 387iep_NetIncomeFromContinuingOperationsAttributableToParentSubjectToAllocationAmongstPartners            
Limited partners                 (366)us-gaap_NetIncomeLossAllocatedToLimitedPartners 1,005us-gaap_NetIncomeLossAllocatedToLimitedPartners 379us-gaap_NetIncomeLossAllocatedToLimitedPartners            
Basic (loss) income per LP unit $ (3.84)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2] $ (2.90)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2] $ 4.06us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2] $ (0.24)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2] $ 1.91us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2] $ 4.13us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2] $ 0.48us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2] $ 2.56us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax [2] $ (3.08)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 9.14us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax $ 3.72us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax            
Basic weighted average LP units outstanding                 119,000,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 110,000,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 102,000,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic            
Dilutive securities, effect on earnings per unit from converison of debt securities                   2iep_DilutiveSecuritiesEffectOnEarningsPerUnitFromConverisonOfDebtSecurities 0iep_DilutiveSecuritiesEffectOnEarningsPerUnitFromConverisonOfDebtSecurities            
Dilutive effect of variable rate convertible notes, Units                   1,000,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities            
Diluted (loss) income per LP unit $ (3.84)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [2] $ (2.90)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [2] $ 4.06us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [2] $ (0.24)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [2] $ 1.90us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [2] $ 4.10us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [2] $ 0.48us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [2] $ 2.50us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted [2] $ (3.08)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted $ 9.07us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted $ 3.72us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted            
Diluted weighted average LP units outstanding                 119,000,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 111,000,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 102,000,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding            
Antidilutive securities excluded from computation of earnings per unit                     5,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount            
Unit distribution liability 0us-gaap_DividendsPayableCurrentAndNoncurrent       142us-gaap_DividendsPayableCurrentAndNoncurrent       0us-gaap_DividendsPayableCurrentAndNoncurrent 142us-gaap_DividendsPayableCurrentAndNoncurrent              
Partnership contributions                 0us-gaap_ProceedsFromPartnershipContribution 593us-gaap_ProceedsFromPartnershipContribution 513us-gaap_ProceedsFromPartnershipContribution            
Common Stock [Member]                                  
Earnings Per LP Unit [Line Items]                                  
Unit distribution declared per share                 $ 6.00us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember		     $ 1.50us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember		          
Units distributed to LP unitholders                 7,203,105us-gaap_DistributionMadeToLimitedPartnerUnitDistribution
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember		                
Depositary Units [Member]                                  
Earnings Per LP Unit [Line Items]                                  
Rights received per depositary unit held                                 0.15881iep_RatioOfRightsPerDepositaryUnit
/ us-gaap_CapitalUnitsByClassAxis
= iep_DepositaryUnitsMember
Rights' subscription price per depositary unit                                 $ 36.7933iep_RightSubscriptionPricePerDepositaryUnit
/ us-gaap_CapitalUnitsByClassAxis
= iep_DepositaryUnitsMember
Aggregate depositary units distributed in connection with rights offering                         13,590,238iep_AggregateDepositaryUnitsDistributedInConnectionWithRightsOffering
/ us-gaap_CapitalUnitsByClassAxis
= iep_DepositaryUnitsMember		        
Proceeds from rights offering                         500iep_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                         12,995,584iep_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                           2,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		 1,600,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		 3,174,604us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		  
Equity issuance, per unit amount                           $ 135.00iep_Equityissuanceperunitamount
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		 $ 75.54iep_Equityissuanceperunitamount
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		 $ 63.00iep_Equityissuanceperunitamount
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		  
Underwriter option to purchase additional depositary units                           300,000iep_UnderwriterOptionToPurchaseAdditionalDepositaryUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		 240,000iep_UnderwriterOptionToPurchaseAdditionalDepositaryUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		 476,191iep_UnderwriterOptionToPurchaseAdditionalDepositaryUnits
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		  
Proceeds from Issuance or Sale of Equity                   581us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_CapitalUnitsByClassAxis
= us-gaap_CommonStockMember
/ us-gaap_ShareholdersEquityClassAxis
= us-gaap_LimitedPartnerMember		              
General partner                                  
Earnings Per LP Unit [Line Items]                                  
Partnership contributions                   $ 12us-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.