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Commitments and Contingencies Energy Narrative (Details) (Energy Segment [Member], USD $) | 8 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 13, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008 | Aug. 31, 2011 | May 31, 2008 plaintiffs | Jun. 30, 2010 plaintiffs | Oct. 25, 2010
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Costs Recognized, Capitalized in Period | $ 21,000,000 us-gaap_EnvironmentalCostsRecognizedCapitalizedInPeriod | $ 101,000,000 us-gaap_EnvironmentalCostsRecognizedCapitalizedInPeriod | $ 111,000,000 us-gaap_EnvironmentalCostsRecognizedCapitalizedInPeriod |  |  |  |  |  |  |  |  |  |
Cost of RINs | 14,000,000 iep_CostofRINs | 127,000,000 iep_CostofRINs | 181,000,000 iep_CostofRINs |  |  |  |  |  |  |  |  |  |
Civil penalty [Member] | CWA violations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Payments |  |  |  | 600,000 us-gaap_AccrualForEnvironmentalLossContingenciesPayments / us-gaap_LitigationCaseAxis = iep_CwaViolationsMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = iep_CivilPenaltyMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |
Civil penalty [Member] | Oversight cost reimbursement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Payments |  |  |  | 1,700,000 us-gaap_AccrualForEnvironmentalLossContingenciesPayments / us-gaap_LitigationCaseAxis = iep_OversightCostReimbursementMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = iep_CivilPenaltyMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |
Wynnewood Consent Order [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Estimate of Possible Loss |  |  | 3,000,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = iep_WynnewoodConsentOrderMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |
CVR Energy, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Leases, Rent Expense | 6,000,000 us-gaap_LeaseAndRentalExpense / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 9,000,000 us-gaap_LeaseAndRentalExpense / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 9,000,000 us-gaap_LeaseAndRentalExpense / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |
CRNF [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Related to Litigation Settlement |  |  |  |  |  |  |  | 11,000,000 us-gaap_GainLossRelatedToLitigationSettlement / dei_LegalEntityAxis = iep_CrnfMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |
Average Increase in Annual Property Tax Expense |  |  |  |  | 11,000,000 iep_AverageIncreaseInAnnualPropertyTaxExpense / dei_LegalEntityAxis = iep_CrnfMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 11,000,000 iep_AverageIncreaseInAnnualPropertyTaxExpense / dei_LegalEntityAxis = iep_CrnfMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 12,000,000 iep_AverageIncreaseInAnnualPropertyTaxExpense / dei_LegalEntityAxis = iep_CrnfMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 11,000,000 iep_AverageIncreaseInAnnualPropertyTaxExpense / dei_LegalEntityAxis = iep_CrnfMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 11,000,000 iep_AverageIncreaseInAnnualPropertyTaxExpense / dei_LegalEntityAxis = iep_CrnfMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |
CRRM [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic Refineries Entered into Environmental Regulatory Concent Decree, Minimum Percentage of Domestic Refining Capacity |  |  | 90.00%iep_DomesticRefineriesEnteredIntoEnvironmentalRegulatoryConcentDecreeMinimumPercentageOfDomesticRefiningCapacity / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |
Environmental Compliance Costs, Anticipated Cost |  |  | 48,000,000 iep_EnvironmentalComplianceCostsAnticipatedCost / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |
CRRM [Member] | EPA, Second Consent Decree, Clean Air Act [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Range of Possible Loss, Maximum |  |  | 1,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_LitigationCaseAxis = iep_EpaSecondConsentDecreeCleanAirActMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |
Environmental Compliance Costs, Anticipated Cost |  |  | 44,000,000 iep_EnvironmentalComplianceCostsAnticipatedCost / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_LitigationCaseAxis = iep_EpaSecondConsentDecreeCleanAirActMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |
CRRM [Member] | Pending Litigation [Member] | Crude Oil Discharge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation receivable |  | 4,000,000 iep_Litigationreceivable / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_LitigationCaseAxis = iep_CrudeOilDischargeMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |  |
Proceeds from Insurance Settlement, Operating Activities |  | 25,000,000 us-gaap_ProceedsFromInsuranceSettlementOperatingActivities / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_LitigationCaseAxis = iep_CrudeOilDischargeMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  | 27,000,000 us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_LitigationCaseAxis = iep_CrudeOilDischargeMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |  |
WRC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Compliance Costs, Anticipated Cost |  |  | 88,000,000 iep_EnvironmentalComplianceCostsAnticipatedCost / dei_LegalEntityAxis = iep_WrcMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |
WRC [Member] | ODEQ [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Paid, Value |  |  |  |  |  |  |  |  |  | 950,000 us-gaap_LossContingencyDamagesPaidValue / dei_LegalEntityAxis = iep_WrcMember / us-gaap_LitigationCaseAxis = iep_OdeqMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |
Goldman [Member] | CVR Energy, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  | 22,600,000 us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = iep_CvrEnergyIncMember / iep_LitigationClaimantAxis = iep_GoldmanMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |  |
Deutsche Bank [Member] | CVR Energy, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Amount |  | 22,700,000 us-gaap_LitigationSettlementAmount / dei_LegalEntityAxis = iep_CvrEnergyIncMember / iep_LitigationClaimantAxis = iep_DeutscheBankMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |  |
Kansas | CVR Energy, Inc. [Member] | Settled [Member] | Crude Oil Discharge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Plaintiffs |  |  |  |  |  |  |  |  |  |  | 16 us-gaap_LossContingencyNumberOfPlaintiffs / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_LitigationCaseAxis = iep_CrudeOilDischargeMember / us-gaap_LitigationStatusAxis = iep_SettledMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  | 4,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_LitigationCaseAxis = iep_CrudeOilDischargeMember / us-gaap_LitigationStatusAxis = iep_SettledMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS |  |
Kansas | CVR Energy, Inc. [Member] | Pending Litigation and Settled, Aggregate [Member] | Crude Oil Discharge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Number of Plaintiffs |  |  |  |  |  |  |  |  |  |  |  | 3 us-gaap_LossContingencyNumberOfPlaintiffs / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_LitigationCaseAxis = iep_CrudeOilDischargeMember / us-gaap_LitigationStatusAxis = iep_PendingLitigationAndSettledAggregateMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_LitigationCaseAxis = iep_CrudeOilDischargeMember / us-gaap_LitigationStatusAxis = iep_PendingLitigationAndSettledAggregateMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS |
Kansas | U.S. Coast Guard / EPA [Member] | CVR Energy, Inc. [Member] | Pending Litigation [Member] | Crude Oil Discharge [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 us-gaap_LossContingencyDamagesSoughtValue / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_LitigationCaseAxis = iep_CrudeOilDischargeMember / iep_LitigationClaimantAxis = iep_USCoastGuardEpaMember / us-gaap_LitigationStatusAxis = us-gaap_PendingLitigationMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS
Coffeyville, Kansas [Member] | CRRM [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Paid, Value |  | 300,000 us-gaap_LossContingencyDamagesPaidValue / us-gaap_EnvironmentalRemediationSiteAxis = iep_CoffeyvilleKansasMember / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |  |
Coffeyville, Kansas Refinery and Phillipsburg, Kansas Terminal Facility [Member] | Kansas | CRRM and CRT [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental Exit Costs, Costs Accrued to Date |  | 1,000,000 us-gaap_EnvironmentalExitCostsCostsAccruedToDate / us-gaap_EnvironmentalRemediationSiteAxis = iep_CoffeyvilleKansasRefineryAndPhillipsburgKansasTerminalFacilityMember / dei_LegalEntityAxis = iep_CrrmAndCrtMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS | 1,000,000 us-gaap_EnvironmentalExitCostsCostsAccruedToDate / us-gaap_EnvironmentalRemediationSiteAxis = iep_CoffeyvilleKansasRefineryAndPhillipsburgKansasTerminalFacilityMember / dei_LegalEntityAxis = iep_CrrmAndCrtMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS |  |  |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies |  | 1,000,000 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_EnvironmentalRemediationSiteAxis = iep_CoffeyvilleKansasRefineryAndPhillipsburgKansasTerminalFacilityMember / dei_LegalEntityAxis = iep_CrrmAndCrtMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS | 2,000,000 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_EnvironmentalRemediationSiteAxis = iep_CoffeyvilleKansasRefineryAndPhillipsburgKansasTerminalFacilityMember / dei_LegalEntityAxis = iep_CrrmAndCrtMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_StatementGeographicalAxis = stpr_KS |  |  |  |  |  |  |  |  |  |
Accrued Expenses and Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Biofuel blending obligation |  | $ 52,000,000 iep_Biofuelblendingobligation / us-gaap_BalanceSheetLocationAxis = iep_AccruedExpensesAndOtherLiabilitiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | $ 17,000,000 iep_Biofuelblendingobligation / us-gaap_BalanceSheetLocationAxis = iep_AccruedExpensesAndOtherLiabilitiesMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |  |  |  |  |
Vitol agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of days for prior notice of nonrenewal |  | 180 days |  |  |  |  |  |  |  |  |  |  |
Renewal term of agreement |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Petroleum Transportation [Member] | CRRM [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Term of unconditional purchase obligation for petroleum transportation |  | 20 years |  |  |  |  |  |  |  |  |  |  |

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