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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 | $ 5,443 iep_IncomeTaxDisclosureBookBasisOfNetAssets | $ 6,092 iep_IncomeTaxDisclosureBookBasisOfNetAssets |  |  |
Book/tax basis difference | (1,566)iep_IncomeTaxDisclosureDifferentBetweenBookBasisAndTaxBasisOfNetAssets | (2,248)iep_IncomeTaxDisclosureDifferentBetweenBookBasisAndTaxBasisOfNetAssets |  |  |
Tax basis of net assets | 3,877 iep_IncomeTaxDisclosureTaxBasisOfNetAssets | 3,844 iep_IncomeTaxDisclosureTaxBasisOfNetAssets |  |  |
Current Income Tax Expense (Benefit) | (80)us-gaap_CurrentIncomeTaxExpenseBenefit | (39)us-gaap_CurrentIncomeTaxExpenseBenefit | (157)us-gaap_CurrentIncomeTaxExpenseBenefit |  |
Deferred Income Tax Expense (Benefit) | 183 us-gaap_DeferredIncomeTaxExpenseBenefit | 157 us-gaap_DeferredIncomeTaxExpenseBenefit | 238 us-gaap_DeferredIncomeTaxExpenseBenefit |  |
Income tax benefit (expense) | 103 us-gaap_IncomeTaxExpenseBenefit | 118 us-gaap_IncomeTaxExpenseBenefit | 81 us-gaap_IncomeTaxExpenseBenefit |  |
Deferred tax assets, Property, pland and equipment | 144 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 141 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |  |  |
Deferred tax asset, net operating loss | 1,348 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 1,137 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |  |
deferred tax asset, Tax credits | 149 iep_DeferredTaxAssetTaxCredits | 166 iep_DeferredTaxAssetTaxCredits |  |  |
Deferred tax asset, Post-employment benefits, including pensions | 388 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 303 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits |  |  |
Deferred tax asset, Reoganization costs | 11 iep_DeferredTaxAssetReoganizationCosts | 27 iep_DeferredTaxAssetReoganizationCosts |  |  |
Deferred tax asset, Other | 231 us-gaap_DeferredTaxAssetsOther | 242 us-gaap_DeferredTaxAssetsOther |  |  |
Deferred Tax Assets, Gross | 2,271 us-gaap_DeferredTaxAssetsGross | 2,016 us-gaap_DeferredTaxAssetsGross |  |  |
Deferred Tax Assets, Valuation Allowance | (1,059)us-gaap_DeferredTaxAssetsValuationAllowance | (1,216)us-gaap_DeferredTaxAssetsValuationAllowance |  |  |
Deferred Tax Assets, Net of Valuation Allowance | 1,212 us-gaap_DeferredTaxAssetsNet | 800 us-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 | 389 us-gaap_DeferredTaxAssetsLiabilitiesNet | 229 us-gaap_DeferredTaxAssetsLiabilitiesNet |  |  |
Deferred tax liability | 1,255 us-gaap_DeferredTaxLiabilities | 1,394 us-gaap_DeferredTaxLiabilities |  |  |
Changes in valuation allowance on deferred tax assets | 157 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 334 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |  |
Cash and cash equivalents | 2,912 us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,262 us-gaap_CashAndCashEquivalentsAtCarryingValue | 3,108 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 2,328 us-gaap_CashAndCashEquivalentsAtCarryingValue
Income tax expense related to interest and penalties related to unrecognized tax benefits | (11)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 8 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 3 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |  |
ARI [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries | 3 us-gaap_UndistributedEarningsOfForeignSubsidiaries / dei_LegalEntityAxis = iep_AriMember | 3 us-gaap_UndistributedEarningsOfForeignSubsidiaries / dei_LegalEntityAxis = iep_AriMember |  |  |
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration | 32 us-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 |  | 221 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember |  |
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration | 1,300 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / dei_LegalEntityAxis = iep_AmericanEntertainmentPropertiesCorpMember |  |  |  |
Icahn Enterprises Holdings [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Book basis of net assets | 5,446 iep_IncomeTaxDisclosureBookBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 6,114 iep_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 | 3,901 iep_IncomeTaxDisclosureTaxBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 3,866 iep_IncomeTaxDisclosureTaxBasisOfNetAssets / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember |  |  |
Income tax benefit (expense) | 103 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 118 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 81 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember |  |
Deferred tax liability | 1,255 us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 1,394 us-gaap_DeferredTaxLiabilities / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember |  |  |
Cash and cash equivalents | 2,912 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 3,262 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 3,108 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember |  | 2,328 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember
Federal-Mogul [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | 868 us-gaap_DeferredTaxAssetsValuationAllowance / dei_LegalEntityAxis = iep_FederalMogulMember |  |  |  |
Undistributed Earnings of Foreign Subsidiaries | 902 us-gaap_UndistributedEarningsOfForeignSubsidiaries / dei_LegalEntityAxis = iep_FederalMogulMember |  |  |  |
Deferred tax asst for tax loss carryforwrds and credits, subject to expiration | 893 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / dei_LegalEntityAxis = iep_FederalMogulMember |  |  |  |
Domestic deferred tax asst for tax loss carryforwards and credits, subject to expiration | 498 us-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 | 161 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / dei_LegalEntityAxis = iep_TropicanaMember |  |  |  |
Viskase [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Changes in valuation allowance on deferred tax assets | 55 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / dei_LegalEntityAxis = iep_ViskaseMember |  |  |  |
Undistributed Earnings of Foreign Subsidiaries | 68 us-gaap_UndistributedEarningsOfForeignSubsidiaries / dei_LegalEntityAxis = iep_ViskaseMember |  |  |  |
Domestic deferred tax asst for tax loss carryforwards and credits, subject to expiration | 100 us-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 | 181 us-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 | 214 us-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 | 15 us-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 | 11 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | 47 us-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 | 22 us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | (104)us-gaap_CurrentIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |
Deferred Income Tax Expense (Benefit) | 201 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | 146 us-gaap_DeferredIncomeTaxExpenseBenefit / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember | 191 us-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 | 193 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |  |  |
Cash and cash equivalents | 196 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember | 359 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |  |
Valuation allowance, deferred tax asset, change in balance | 196 iep_Valuationallowancedeferredtaxassetchangeinbalance / us-gaap_StatementBusinessSegmentsAxis = iep_GamingSegmentMember |  |  |  |
Energy Segment [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax benefit (expense) | 73 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 195 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 182 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | [1] |
Cash and cash equivalents | 754 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 842 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |
Energy Segment [Member] | Kansas | American Entertainment Properties Corp. [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Domestic tax credits | 2 iep_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 | 18 iep_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) | 3 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 51 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | (5)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |
Changes in valuation allowance on deferred tax assets |  | 55 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |  |
Cash and cash equivalents | 39 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember | 19 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_FoodPackagingSegmentMember |  |  |
Automotive Segment [Member] |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax benefit (expense) | 91 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 180 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 29 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Changes in valuation allowance on deferred tax assets | (33)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 279 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |
Cash and cash equivalents | 332 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 761 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |
Cash and cash equivalents held by foreign subsidiaries | 138 iep_CashAndCashEquivalentsHeldByForeignSubsidiaries / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Release of deferred tax allowance | $ 18 iep_Releaseofdeferredtaxallowance / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | $ 287 iep_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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