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Debt Narrative - Debt and Credit Facilities - Energy (Details) (USD $) | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 19, 2014 | Apr. 13, 2011 | Oct. 23, 2012 | Jan. 29, 2014 | Dec. 01, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain on extinguishment of debt | $ (2,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt | $ (126,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |
Citizen Bank Revolver [Member] | Railcar Segment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility |  |  | 350,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |
Senior credit facility, maximum borrowing availability |  |  | 250,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |
Line of credit facility, outstanding borowings | 100,000,000 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember |  |  |  |  |  |
CRNF Term Loan [Member] | Energy Segment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Term Loan Facility |  |  |  | 125,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_CRNFTermLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |
Revolving Credit Facility [Member] | Energy Segment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility |  |  |  | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |
Line of credit facility, incremental borrowing increase |  |  |  | 50,000,000 iep_LineOfCreditFacilityIncrementalBorrowingIncrease / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |
Line of credit facility, outstanding borowings | 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |
CVR 2022 Notes [Member] | Energy Segment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_CVR2022NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |
Interest rate, long-term debt |  |  |  |  | 6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_CVR2022NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |
2022 Notes [Member] | Senior unsecured notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  | 1,350,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |
ABL Credit Facility [Member] | Energy Segment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior credit facility, maximum borrowing availability | 339,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_AblCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  | 400,000,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_DebtInstrumentAxis = iep_AblCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Line of credit facility, incremental borrowing increase |  |  |  |  |  |  | 200,000,000 iep_LineOfCreditFacilityIncrementalBorrowingIncrease / us-gaap_DebtInstrumentAxis = iep_AblCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Letters of Credit Outstanding, Amount | 28,000,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = iep_AblCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |
Line of credit facility, outstanding borowings | $ 0 us-gaap_LineOfCredit / us-gaap_DebtInstrumentAxis = iep_AblCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |  |  |  |
Base Rate [Member] | Energy Segment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage spread on debt | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / iep_VariableRateOptionAxis = us-gaap_BaseRateMember |  |  |  |  |  |
EuroDollar [Member] | Energy Segment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage spread on debt | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / iep_VariableRateOptionAxis = us-gaap_EurodollarMember |  |  |  |  |  |
LIBOR [Member] | Citizen Bank Revolver [Member] | Railcar Segment [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Percentage spread on debt | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = iep_CitizenBankRevolverMember / us-gaap_StatementBusinessSegmentsAxis = iep_RailcarSegmentMember / iep_VariableRateOptionAxis = iep_LiborMember |  |  |  |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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