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Income Taxes Effective Income Tax Rate Reconciliation (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Contingency [Line Items]      
Federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign operations 6.70%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential 0.70%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Valuation allowance 21.50%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (15.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 14.80%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent 7.50%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense (2.30%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense
Effective in tax rate reconciliation, change in goodwill, percent (5.70%)iep_Effectiveintaxratereconciliationchangeingoodwillpercent 0.20%iep_Effectiveintaxratereconciliationchangeingoodwillpercent 0.50%iep_Effectiveintaxratereconciliationchangeingoodwillpercent
Gain on settlement of liabilities subject to compromise 4.90%iep_EffectiveIncomeTaxRateReconciliationGainOnLiabilitiesSubjectToCompromise 0.00%iep_EffectiveIncomeTaxRateReconciliationGainOnLiabilitiesSubjectToCompromise (51.70%)iep_EffectiveIncomeTaxRateReconciliationGainOnLiabilitiesSubjectToCompromise
Income not subject to taxation (47.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (25.40%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (12.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Other (6.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 2.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective Income Tax Rate, Continuing Operations 16.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations (5.10%)us-gaap_EffectiveIncomeTaxRateContinuingOperations (11.90%)us-gaap_EffectiveIncomeTaxRateContinuingOperations