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Financial Instruments Derivative Activities Table (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Credit swaps(1) |  |  |  |
Derivative [Line Items] |  |  |  |
Long Notional Exposure | $ 311 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapSellingProtectionMember | [1] | $ 389 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapSellingProtectionMember | [1]
Short Notional Exposure | 1,738 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapSellingProtectionMember | [1] | 1,493 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapSellingProtectionMember | [1]
Equity swaps |  |  |  |
Derivative [Line Items] |  |  |  |
Long Notional Exposure | 1 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquitySwapMember |  | 1 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquitySwapMember |
Short Notional Exposure | 13,113 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquitySwapMember |  | 11,312 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_EquitySwapMember |
Foreign currency forwards |  |  |  |
Derivative [Line Items] |  |  |  |
Long Notional Exposure | 0 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |  | 0 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |
Short Notional Exposure | 1,088 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |  | 1,578 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember |
Interest rate swap contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value of interest rate swap agreements | 16,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 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 |  | 74 iep_NotionalExposureofDerivativesShortPositionlessthanthreemonths / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Long Notional Exposure | 0 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [2] | 0 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [2]
Short Notional Exposure | 137 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [2] | 137 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | [2]
Credit Default Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value of interest rate swap agreements | 10,900 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember |  | 9,300 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember |
Short Notional Exposure | 1,700 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember |  | 1,500 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CreditDefaultSwapMember |
Commodity contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Long Notional Exposure | 42 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | 36 iep_NotionalExposureOfDerivativesLongPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
Short Notional Exposure | $ 749 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |  | $ 234 iep_NotionalExposureOfDerivativesShortPosition / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember |
[1] | The short notional amount on our credit default swap positions is approximately $10.9 billion and $9.3 billion as of March 31, 2015 and December 31, 2014, respectively. However, because credit spreads cannot compress below zero, our downside short notional exposure to loss is approximately $1.7 billion and $1.5 billion as of March 31, 2015 and December 31, 2014, respectively.
[2] | The short notional amount on certain of our interest rate contracts with a three month duration is approximately $16.0 billion as of both March 31, 2015 and 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) as of both March 31, 2015 and December 31, 2014.

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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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