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Income Taxes Accounting for Uncertainty in Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Unrecognized tax benefits balance	$ 113us-gaap_UnrecognizedTaxBenefits	$ 132us-gaap_UnrecognizedTaxBenefits	$ 113us-gaap_UnrecognizedTaxBenefits	$ 388us-gaap_UnrecognizedTaxBenefits
Addition based on tax positions related to the current year	18us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	23us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	23us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Acquisition of CVR	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition	18us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition
Increase for tax positions of prior years	10us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	6us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	15us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Decrease for tax positions of prior years	(14)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	(9)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	(15)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Decrease for statute of limitation expiration	(3)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	(1)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	(14)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Settlements	(25)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	(301)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Impact of currency translation and other	(5)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	(1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	(1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation
Unrecognized tax benefits that if recognized, would affect the effective tax rate	76us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	54us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	71us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Liabilities recognized for tax related net interest and penalties	19us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	27us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	17us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Income tax expense related to interest and penalties related to unrecognized tax benefits	(11)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Federal-Mogul [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits that if recognized, would affect the effective tax rate	2us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate / dei_LegalEntityAxis = iep_FederalMogulMember
Possibility that unrecognized tax benefits may drecrease in the next year	$ 3us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit / dei_LegalEntityAxis = iep_FederalMogulMember

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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