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Fair Value Measurements Assets Fair Value Nonrecurring Basis (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of property, plant, and equipment	$ 27us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	$ 16us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Impairment of equity method investments	5us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment	0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Impairment of goodwill	103us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of property, plant, and equipment impaired during the period	53iep_FairValueOfPropertyPlantAndEquipmentImpairedDuringPeriod / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	74iep_FairValueOfPropertyPlantAndEquipmentImpairedDuringPeriod / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair value of equity method investments measured on a non-recurring basis that was written down during the period	10iep_FairValueofInvestmentsImpairedDuringthePeriod / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	0iep_FairValueofInvestmentsImpairedDuringthePeriod / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value of Property, Goodwill Impaired During the Period	$ 827iep_FairValueOfPropertyGoodwillImpairedDuringPeriod / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember	$ 0iep_FairValueOfPropertyGoodwillImpairedDuringPeriod / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember

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- Definition

Fair Value of investments Impaired During the Period

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Fair Value of Property, Goodwill Impaired During the Period

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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