XML 102 R60.htm IDEA: XBRL DOCUMENT
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Fair Value Measurements Investment Fair Value (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Investments [Abstract] |  |  |  |
Investments | $ 14,500 us-gaap_Investments |  | $ 12,261 us-gaap_Investments |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 337 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue |  | 884 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue |
Investment Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 13,961 us-gaap_Investments / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11,826 us-gaap_Investments / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 337 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 884 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 13,961 us-gaap_Investments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11,826 us-gaap_Investments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Derivative contracts, Assets at fair value | 3 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [1] | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [1]
Fair value of investment and derivative assets | 13,964 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11,826 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Derivative contracts, Liabilities at fair value | 614 us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [2] | 639 us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [2]
Fair value of investment and derivative liabilities | 951 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 1,523 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 13,659 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11,314 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 334 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 884 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,846 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_CommunicationsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 820 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_CommunicationsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Consumer, non-cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,308 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 3,522 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 44 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 436 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 414 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 334 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 787 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Diversified [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 23 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_DiversifiedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 29 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_DiversifiedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 1,895 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 3,050 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 417 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 300 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 45 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Funds [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 6 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 8 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Industrial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 99 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_IndustrialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_IndustrialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Equity securities | Technology [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 5,635 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_TechnologyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 3,173 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_TechnologyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Corporate debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 129 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 332 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Corporate debt [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 75 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 287 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Corporate debt [Member] | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 19 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Corporate debt [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 7 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Corporate debt [Member] | Sovereign debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = us-gaap_SovereignDebtMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 5 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = us-gaap_SovereignDebtMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Corporate debt [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 28 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_UtilitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 29 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_UtilitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Mortgage-backed securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 173 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 180 us-gaap_TradingSecurities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Debt Securities [Member] | Consumer, non-cyclical [Member] |  |  |  |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 337 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 884 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Recurring measurement [Member] | Debt Securities [Member] | Energy Segment [Member] |  |  |  |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 3 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 13,639 us-gaap_Investments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11,130 us-gaap_Investments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Derivative contracts, Assets at fair value | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [1] | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [1]
Fair value of investment and derivative assets | 13,639 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11,130 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Derivative contracts, Liabilities at fair value | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [2] | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [2]
Fair value of investment and derivative liabilities | 334 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 876 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 13,639 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11,130 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 334 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 876 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,846 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_CommunicationsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 820 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_CommunicationsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Consumer, non-cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 2,308 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 3,344 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 44 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 436 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 414 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 334 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 787 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Diversified [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 23 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_DiversifiedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 29 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_DiversifiedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 1,895 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 3,050 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 417 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 300 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 45 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Funds [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Industrial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 79 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_IndustrialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_IndustrialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Equity securities | Technology [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 5,635 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_TechnologyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 3,173 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_TechnologyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Sovereign debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = us-gaap_SovereignDebtMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = us-gaap_SovereignDebtMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_UtilitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_UtilitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Mortgage-backed securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Debt Securities [Member] | Consumer, non-cyclical [Member] |  |  |  |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 334 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 876 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 1 [Member] | Recurring measurement [Member] | Debt Securities [Member] | Energy Segment [Member] |  |  |  |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 247 us-gaap_Investments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 409 us-gaap_Investments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Derivative contracts, Assets at fair value | 3 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [1] | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [1]
Fair value of investment and derivative assets | 250 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 409 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Derivative contracts, Liabilities at fair value | 614 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [2] | 639 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [2]
Fair value of investment and derivative liabilities | 617 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 647 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 20 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 184 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 8 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_CommunicationsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_CommunicationsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Consumer, non-cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 178 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Diversified [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_DiversifiedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_DiversifiedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Funds [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 6 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 8 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Industrial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 20 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_IndustrialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_IndustrialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Equity securities | Technology [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_TechnologyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_TechnologyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 54 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 45 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 19 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 7 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 11 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Sovereign debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = us-gaap_SovereignDebtMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 5 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = us-gaap_SovereignDebtMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Utilities [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 28 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_UtilitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 29 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_UtilitiesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Mortgage-backed securities [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 173 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 180 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Debt Securities [Member] | Consumer, non-cyclical [Member] |  |  |  |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 3 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 8 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 2 [Member] | Recurring measurement [Member] | Debt Securities [Member] | Energy Segment [Member] |  |  |  |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 3 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Investments | 75 us-gaap_Investments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 287 us-gaap_Investments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Derivative contracts, Assets at fair value | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [1] | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [1]
Fair value of investment and derivative assets | 75 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 287 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Derivative contracts, Liabilities at fair value | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [2] | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember | [2]
Fair value of investment and derivative liabilities | 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Communications [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_CommunicationsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_CommunicationsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Consumer, non-cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerNonCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Diversified [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_DiversifiedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_DiversifiedMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Funds [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Securities sold, not yet purchased, at fair value: [Abstract] |  |  |  |
Securities sold, not yet purchased, at fair value | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_FinancialInstrumentsSoldNotYetPurchasedAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FundsMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Industrial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_IndustrialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_IndustrialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Equity securities | Technology [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_TechnologyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_TechnologyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 75 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 287 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Consumer, cyclical [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 75 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 287 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_ConsumerCyclicalMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Energy Segment [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_EnergySectorMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Financial [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Trading securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember / invest_InvestmentSectorAxis = iep_FinancialMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_InvestmentSegmentMember |
Investment Segment [Member] | Level 3 [Member] | Recurring measurement [Member] | Corporate debt [Member] | Sovereign debt [Member] |  |  |  |
Investments [Abstract] |  |  |  |
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[1] | Included in other assets in our consolidated balance sheets.
[2] | Included in accrued expenses and other liabilities in our consolidated balance sheets.

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