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Income Taxes Narrative (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]
Book basis of net assets	$ 5,443iep_IncomeTaxDisclosureBookBasisOfNetAssets	$ 6,092iep_IncomeTaxDisclosureBookBasisOfNetAssets
Book/tax basis difference	(1,566)iep_IncomeTaxDisclosureDifferentBetweenBookBasisAndTaxBasisOfNetAssets	(2,248)iep_IncomeTaxDisclosureDifferentBetweenBookBasisAndTaxBasisOfNetAssets
Tax basis of net assets	3,877iep_IncomeTaxDisclosureTaxBasisOfNetAssets	3,844iep_IncomeTaxDisclosureTaxBasisOfNetAssets
Current Income Tax Expense (Benefit)	(80)us-gaap_CurrentIncomeTaxExpenseBenefit	(39)us-gaap_CurrentIncomeTaxExpenseBenefit	(157)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit)	183us-gaap_DeferredIncomeTaxExpenseBenefit	157us-gaap_DeferredIncomeTaxExpenseBenefit	238us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax benefit (expense)	103us-gaap_IncomeTaxExpenseBenefit	118us-gaap_IncomeTaxExpenseBenefit	81us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets, Property, pland and equipment	144us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment	141us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred tax asset, net operating loss	1,348us-gaap_DeferredTaxAssetsOperatingLossCarryforwards	1,137us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
deferred tax asset, Tax credits	149iep_DeferredTaxAssetTaxCredits	166iep_DeferredTaxAssetTaxCredits
Deferred tax asset, Post-employment benefits, including pensions	388us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	303us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Deferred tax asset, Reoganization costs	11iep_DeferredTaxAssetReoganizationCosts	27iep_DeferredTaxAssetReoganizationCosts
Deferred tax asset, Other	231us-gaap_DeferredTaxAssetsOther	242us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross	2,271us-gaap_DeferredTaxAssetsGross	2,016us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance	(1,059)us-gaap_DeferredTaxAssetsValuationAllowance	(1,216)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net of Valuation Allowance	1,212us-gaap_DeferredTaxAssetsNet	800us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Property, Plant and Equipment	(239)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment	(216)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liabilities, Intangible Assets	(177)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	(187)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred tax liability, Investment in partnerships	(1,349)iep_DeferredTaxLiabilityInvestmentInPartnerships	(1,242)iep_DeferredTaxLiabilityInvestmentInPartnerships
Deferred tax liabilities, Investment in subsidiaries	(307)iep_DeferredTaxLiabilitiesInvestmentInSubsidiaries	(307)iep_DeferredTaxLiabilitiesInvestmentInSubsidiaries
Deferred Tax Liabilities, Other	(6)us-gaap_DeferredTaxLiabilitiesOther	(13)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Gross	(2,078)us-gaap_DeferredIncomeTaxLiabilities	(1,965)us-gaap_DeferredIncomeTaxLiabilities
deferred tax liabilities, net of deferred tax assets	(866)iep_DeferedTaxLiabilitiesNetOfDeferredTaxAssets	(1,165)iep_DeferedTaxLiabilitiesNetOfDeferredTaxAssets
Deferred tax asset	389us-gaap_DeferredTaxAssetsLiabilitiesNet	229us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred tax liability	1,255us-gaap_DeferredTaxLiabilities	1,394us-gaap_DeferredTaxLiabilities
Changes in valuation allowance on deferred tax assets	157us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	334us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Cash and cash equivalents	2,912us-gaap_CashAndCashEquivalentsAtCarryingValue	3,262us-gaap_CashAndCashEquivalentsAtCarryingValue	3,108us-gaap_CashAndCashEquivalentsAtCarryingValue		2,328us-gaap_CashAndCashEquivalentsAtCarryingValue
Income tax expense related to interest and penalties related to unrecognized tax benefits	(11)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
ARI [Member]
Income Tax Contingency [Line Items]
Undistributed Earnings of Foreign Subsidiaries	3us-gaap_UndistributedEarningsOfForeignSubsidiaries / dei_LegalEntityAxis = iep_AriMember	3us-gaap_UndistributedEarningsOfForeignSubsidiaries / dei_LegalEntityAxis = iep_AriMember
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration	32us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / dei_LegalEntityAxis = iep_AriMember
American Entertainment Properties Corp. [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Valuation Allowance	(55)us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember
Changes in valuation allowance on deferred tax assets	(3)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember		221us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration	1,300us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember
Icahn Enterprises Holdings [Member]
Income Tax Contingency [Line Items]
Book basis of net assets	5,446iep_IncomeTaxDisclosureBookBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember	6,114iep_IncomeTaxDisclosureBookBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Book/tax basis difference	(1,545)iep_IncomeTaxDisclosureDifferentBetweenBookBasisAndTaxBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember	(2,248)iep_IncomeTaxDisclosureDifferentBetweenBookBasisAndTaxBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Tax basis of net assets	3,901iep_IncomeTaxDisclosureTaxBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember	3,866iep_IncomeTaxDisclosureTaxBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Income tax benefit (expense)	103us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember	118us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember	81us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Deferred tax liability	1,255us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember	1,394us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Cash and cash equivalents	2,912us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember	3,262us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember	3,108us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember		2,328us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Federal-Mogul [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Valuation Allowance	868us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = iep_FederalMogulMember
Undistributed Earnings of Foreign Subsidiaries	902us-gaap_UndistributedEarningsOfForeignSubsidiaries / dei_LegalEntityAxis = iep_FederalMogulMember
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration	893us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / dei_LegalEntityAxis = iep_FederalMogulMember
Domestic deferred tax asst for tax loss carryforwards and credits, subject to expiration	498us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic / dei_LegalEntityAxis = iep_FederalMogulMember
Tropicana [Member]
Income Tax Contingency [Line Items]
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration	161us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / dei_LegalEntityAxis = iep_TropicanaMember
Viskase [Member]
Income Tax Contingency [Line Items]
Changes in valuation allowance on deferred tax assets	55us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / dei_LegalEntityAxis = iep_ViskaseMember
Undistributed Earnings of Foreign Subsidiaries	68us-gaap_UndistributedEarningsOfForeignSubsidiaries / dei_LegalEntityAxis = iep_ViskaseMember
Domestic deferred tax asst for tax loss carryforwards and credits, subject to expiration	100us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic / dei_LegalEntityAxis = iep_ViskaseMember
United Kingdom | Federal-Mogul [Member]
Income Tax Contingency [Line Items]
Foreign deferred tax asst for tax loss carryforwards and credits, subject to expiration	181us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementGeographicalAxis = country_GB
Other foreign jurisdictions [Member] | Federal-Mogul [Member]
Income Tax Contingency [Line Items]
Foreign deferred tax asst for tax loss carryforwards and credits, subject to expiration	214us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / dei_LegalEntityAxis = iep_FederalMogulMember / us-gaap_StatementGeographicalAxis = iep_OtherForeignCountriesMember
Foreign Tax Authority [Member] | Viskase [Member]
Income Tax Contingency [Line Items]
Foreign deferred tax asst for tax loss carryforwards and credits, subject to expiration	15us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign / dei_LegalEntityAxis = iep_ViskaseMember / us-gaap_StatementGeographicalAxis = us-gaap_ForeignCountryMember
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Current Income Tax Expense (Benefit)	(35)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	(61)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	(53)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Deferred Income Tax Expense (Benefit)	(18)us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	11us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember	47us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Current Income Tax Expense (Benefit)	(45)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	22us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	(104)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Deferred Income Tax Expense (Benefit)	201us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	146us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember	191us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember
Gaming Segment [Member]
Income Tax Contingency [Line Items]
Income tax benefit (expense)	(147)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember	(3)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember	(4)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Changes in valuation allowance on deferred tax assets	193us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Cash and cash equivalents	196us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember	359us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Valuation allowance, deferred tax asset, change in balance	196iep_Valuationallowancedeferredtaxassetchangeinbalance / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember
Energy Segment [Member]
Income Tax Contingency [Line Items]
Income tax benefit (expense)	73us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	195us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	182us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	[1]
Cash and cash equivalents	754us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	842us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Energy Segment [Member] | Kansas | American Entertainment Properties Corp. [Member]
Income Tax Contingency [Line Items]
Domestic tax credits	2iep_DomesticTaxCredits / us-gaap_IncomeTaxAuthorityAxis = stpr_KS / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Energy Segment [Member] | Oklahoma | American Entertainment Properties Corp. [Member]
Income Tax Contingency [Line Items]
Domestic tax credits	18iep_DomesticTaxCredits / us-gaap_IncomeTaxAuthorityAxis = stpr_OK / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Food Packaging Segment [Member]
Income Tax Contingency [Line Items]
Income tax benefit (expense)	3us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	51us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	(5)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Changes in valuation allowance on deferred tax assets		55us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Cash and cash equivalents	39us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember	19us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember
Automotive Segment [Member]
Income Tax Contingency [Line Items]
Income tax benefit (expense)	91us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	180us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	29us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Changes in valuation allowance on deferred tax assets	(33)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	279us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Cash and cash equivalents	332us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	761us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Cash and cash equivalents held by foreign subsidiaries	138iep_CashAndCashEquivalentsHeldByForeignSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Release of deferred tax allowance	$ 18iep_Releaseofdeferredtaxallowance / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember	$ 287iep_Releaseofdeferredtaxallowance / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Minimum [Member] | American Entertainment Properties Corp. [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2026
Minimum [Member] | Tropicana [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2028
Minimum [Member] | United States | Federal-Mogul [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2015
Minimum [Member] | United States | Viskase [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2024
Maximum [Member] | American Entertainment Properties Corp. [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2034
Maximum [Member] | United States | Federal-Mogul [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Dates	2034
[1] We consolidated CVR effective May 4, 2012.

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