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Financial Instruments Derivative Activities Table (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Credit default swaps(1) |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 9,300 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember |  |
Primary underlying risk: |  |  |
Long Notional Exposure | 389 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember |  | 0 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember
Short Notional Exposure | 1,493 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember | [1] | 0 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember
Equity swaps |  |  |
Primary underlying risk: |  |  |
Long Notional Exposure | 1 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquitySwapMember |  | 1 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquitySwapMember
Short Notional Exposure | 11,312 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquitySwapMember |  | 10,508 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquitySwapMember
Foreign currency forwards |  |  |
Primary underlying risk: |  |  |
Long Notional Exposure | 0 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |  | 12 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember
Short Notional Exposure | 1,578 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |  | 1,676 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember
Interest rate contracts(2) |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 16,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |
Notional Exposure of Derivatives, Short Position, less than three months | 74 iep_NotionalExposureofDerivativesShortPositionlessthanthreemonths / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [1] |
Primary underlying risk: |  |  |
Long Notional Exposure | 0 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 0 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Short Notional Exposure | 137 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [2] | 63 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Commodity contracts |  |  |
Primary underlying risk: |  |  |
Long Notional Exposure | 36 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 60 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Short Notional Exposure | $ 234 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | $ 669 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
[1] | The short notional amount on our credit default swap positions is approximately $9.3 billion as of December 31, 2014. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is approximately $1.5 billion.
[2] | The short notional amount on certain of our interest rate contracts with a three month duration is $16.0 billion as of December 31, 2014. We assume that interest rates will not fall below zero and therefore our downside short notional exposure to loss on these contracts is $74 million (of the total $137 million disclosed in the above table).

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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