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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 | $ 558 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 6 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 1,361 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |
Amortization expense associated with definite-lived intangible assets | 83 us-gaap_AmortizationOfIntangibleAssets | 81 us-gaap_AmortizationOfIntangibleAssets | 77 us-gaap_AmortizationOfIntangibleAssets |  |  |  |
2015 | 83 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |  |  |
2016 | 81 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |  |  |
2017 | 81 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |  |  |
2018 | 72 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |  |  |
2019 | 71 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |  |  |
Thereafter | 405 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |  |  |  |  |
Total estimated future amortization expense for definite-lived intangible assets | 793 iep_TotalExpectedFutureAmortization |  |  |  |  |  |
Goodwill | 2,000 us-gaap_Goodwill | 2,074 us-gaap_Goodwill |  |  |  |  |
Impairment of goodwill | 103 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |  |  |  |  |
Goodwill, Gross | 2,329 us-gaap_GoodwillGross | 2,300 us-gaap_GoodwillGross | 2,308 us-gaap_GoodwillGross |  |  |  |
Impairment | 135 us-gaap_AssetImpairmentCharges | 16 us-gaap_AssetImpairmentCharges | 129 us-gaap_AssetImpairmentCharges |  |  |  |
Goodwill, Period Increase (Decrease) |  | 8 us-gaap_GoodwillPeriodIncreaseDecrease |  |  |  |  |
Automotive Segment [Member] |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 1,163 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,134 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |
Impairment of intangible assets, Indefinite-lived (Excluding goodwill) |  |  | 46 us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |
Goodwill, Gross | 1,389 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,360 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 1,368 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Impairment | 24 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 8 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 98 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Goodwill, Period Increase (Decrease) |  | 8 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |
Energy Segment [Member] |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 827 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 930 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |
Impairment of goodwill | 103 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |
Goodwill, Gross | 930 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 930 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 930 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |
Impairment | 103 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | [1] |  |  |
Goodwill, Period Increase (Decrease) |  | 0 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |
Gaming Segment [Member] |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | 3 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | 2 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |  |  |
Food Packaging Segment [Member] |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | 3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |  |  |  |
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |  |  |  |
Goodwill, Gross | 3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 3 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |  |  |
Impairment | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 0 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |  |  |
Goodwill, Period Increase (Decrease) |  | 0 us-gaap_GoodwillPeriodIncreaseDecrease / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |  |  |  |
Metals Segment [Member] |  |  |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment | 3 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_MetalsSegmentMember | 2 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = iep_MetalsSegmentMember | 18 us-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 | 71 iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets / us-gaap_BusinessAcquisitionAxis = iep_AffiniaMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |  |  |
business combinations, recognized identifiable assets, net intangible assets | 51 iep_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 | 252 iep_Businesscombinationsrecognizedidentifiableassetsnettangibleassets / us-gaap_BusinessAcquisitionAxis = iep_LumiereMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |  |  |  |  |
business combinations, recognized identifiable assets, net intangible assets | 9 iep_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 |  |  |  |  | 15 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = iep_DimitrovgradskiyZavodVkladisheyMember / iep_ReportingUnitAxis = iep_PowertrainMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Goodwill, Period Increase (Decrease) |  |  |  |  | 6 us-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 |  |  |  |  |  |  | 2 us-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 |  |  |  |  |  |  | 1 us-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) |  |  |  |  |  | 26 us-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 |  |  |  |  |  |  | 51 us-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 |  |  |  |  |  |  | 1 us-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 | 103 us-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 |  | 16 us-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 |  | 6 us-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 | $ 9 iep_Businesscombinationsrecognizedidentifiableassetsnetintangibleassets / us-gaap_BusinessAcquisitionAxis = iep_LumiereMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = iep_GamingLicenseMember / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |  |  |  |  |
[1] | We consolidated CVR effective May 4, 2012.

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