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Goodwill and Intangible Assets, Net Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2014
Jun. 30, 2014
Sep. 30, 2014
Goodwill and Intangible Assets [Line Items]            
Payments to Acquire Businesses, Gross $ 558us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 6us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 1,361us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired      
Amortization expense associated with definite-lived intangible assets 83us-gaap_AmortizationOfIntangibleAssets 81us-gaap_AmortizationOfIntangibleAssets 77us-gaap_AmortizationOfIntangibleAssets      
2015 83us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths          
2016 81us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo          
2017 81us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree          
2018 72us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour          
2019 71us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive          
Thereafter 405us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive          
Total estimated future amortization expense for definite-lived intangible assets 793iep_TotalExpectedFutureAmortization          
Goodwill 2,000us-gaap_Goodwill 2,074us-gaap_Goodwill        
Impairment of goodwill 103us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss        
Goodwill, Gross 2,329us-gaap_GoodwillGross 2,300us-gaap_GoodwillGross 2,308us-gaap_GoodwillGross      
Impairment 135us-gaap_AssetImpairmentCharges 16us-gaap_AssetImpairmentCharges 129us-gaap_AssetImpairmentCharges      
Goodwill, Period Increase (Decrease)   8us-gaap_GoodwillPeriodIncreaseDecrease        
Automotive Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Goodwill 1,163us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
1,134us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Impairment of intangible assets, Indefinite-lived (Excluding goodwill)     46us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
     
Impairment of goodwill 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Goodwill, Gross 1,389us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
1,360us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
1,368us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
     
Impairment 24us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
8us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
98us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
     
Goodwill, Period Increase (Decrease)   8us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Energy Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Goodwill 827us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
930us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
       
Impairment of goodwill 103us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
       
Goodwill, Gross 930us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
930us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
930us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
     
Impairment 103us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
0us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
0us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
[1]      
Goodwill, Period Increase (Decrease)   0us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
       
Gaming Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Impairment 0us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
3us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
2us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
     
Food Packaging Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Goodwill 3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
3us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
       
Impairment of goodwill 0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
0us-gaap_GoodwillImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
       
Goodwill, Gross 3us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
3us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
3us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
     
Impairment 0us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
0us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
0us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
     
Goodwill, Period Increase (Decrease)   0us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_StatementBusinessSegmentsAxis
= iep_FoodPackagingSegmentMember
       
Metals Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Impairment 3us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
2us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
18us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= iep_MetalsSegmentMember
     
Affinia [Member] | Automotive Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
business combinations, recognized identifiable assets, net tangible assets 71iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
         
business combinations, recognized identifiable assets, net intangible assets 51iep_Businesscombinationsrecognizedidentifiableassetsnetintangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
         
BERU [Member] | Automotive Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Goodwill, purchase accounting adjustment   (8)us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= iep_BeruMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Definite-lived intangibles, purchase accounting adjustment   (3)us-gaap_FiniteLivedIntangibleAssetsPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= iep_BeruMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Lumiere [Member] | Gaming Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
business combinations, recognized identifiable assets, net tangible assets 252iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_LumiereMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
         
business combinations, recognized identifiable assets, net intangible assets 9iep_Businesscombinationsrecognizedidentifiableassetsnetintangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_LumiereMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
         
Powertrain [Member] | Dimitrovgradskiy Zavod Vkladishey [Member] | Automotive Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Payments to Acquire Businesses, Gross       15us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= iep_DimitrovgradskiyZavodVkladisheyMember
/ iep_ReportingUnitAxis
= iep_PowertrainMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Goodwill, Period Increase (Decrease)       6us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_BusinessAcquisitionAxis
= iep_DimitrovgradskiyZavodVkladisheyMember
/ iep_ReportingUnitAxis
= iep_PowertrainMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles           2us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= iep_DimitrovgradskiyZavodVkladisheyMember
/ iep_ReportingUnitAxis
= iep_PowertrainMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets           1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= iep_DimitrovgradskiyZavodVkladisheyMember
/ iep_ReportingUnitAxis
= iep_PowertrainMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Powertrain [Member] | Affinia [Member] | Automotive Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Goodwill, Period Increase (Decrease)         26us-gaap_GoodwillPeriodIncreaseDecrease
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ iep_ReportingUnitAxis
= iep_PowertrainMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles           51us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ iep_ReportingUnitAxis
= iep_PowertrainMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets           1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= iep_AffiniaMember
/ iep_ReportingUnitAxis
= iep_PowertrainMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
Fertilizer reporting unit [Member] | Energy Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Impairment of goodwill 103us-gaap_GoodwillImpairmentLoss
/ iep_ReportingUnitAxis
= iep_FertilizerreportingunitMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
         
Fuel Pump [Member] [Member] | Automotive Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Foreign exchange   16us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= iep_FuelPumpMemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Finite-Lived Intangible Assets, Period Increase (Decrease)   (2)us-gaap_FiniteLivedIntangibleAssetsPeriodIncreaseDecrease
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= iep_FuelPumpMemberMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Trademarks and brand names | Fuel Pump [Member] [Member] | Automotive Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit   6us-gaap_IndefiniteLivedIntangibleAssetsWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= iep_FuelPumpMemberMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
       
Gaming licenses | Lumiere [Member] | Gaming Segment [Member]            
Goodwill and Intangible Assets [Line Items]            
Fair Value Inputs, Long-term Revenue Growth Rate 2.00%us-gaap_FairValueInputsLongTermRevenueGrowthRate
/ us-gaap_BusinessAcquisitionAxis
= iep_LumiereMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= iep_GamingLicenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
         
Fair Value Inputs, Assumed Effective Tax Rate 38.10%iep_FairValueInputsAssumedEffectiveTaxRate
/ us-gaap_BusinessAcquisitionAxis
= iep_LumiereMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= iep_GamingLicenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
         
Fair Value Inputs, Discount Rate 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_BusinessAcquisitionAxis
= iep_LumiereMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= iep_GamingLicenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
         
business combinations, recognized identifiable assets, net intangible assets $ 9iep_Businesscombinationsrecognizedidentifiableassetsnetintangibleassets
/ us-gaap_BusinessAcquisitionAxis
= iep_LumiereMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= iep_GamingLicenseMember
/ us-gaap_StatementBusinessSegmentsAxis
= iep_GamingSegmentMember
         
[1] We consolidated CVR effective May 4, 2012.