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Debt Narrative - Debt Facilities - Automotive (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 15, 2014 | Dec. 06, 2013
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt | $ (162)us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ (10)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |
Automotive Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, Weighted Average Interest Rate | 4.70%us-gaap_DebtWeightedAverageInterestRate / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 2.30%us-gaap_DebtWeightedAverageInterestRate / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |
Loss on extinguishment of debt | 36 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Tranche B Loan [Member] | Automotive Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term Debt, Gross |  |  |  | 700 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = iep_TrancheBLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Tranche C Loan [Member] | Automotive Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount deposited in term letter of credit account under credit facility | 50 iep_AmountDepositedInTermLetterOfCreditAccountUnderCreditFacility / us-gaap_DebtInstrumentAxis = iep_TrancheCLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Long-term Debt, Gross |  |  |  | 1,900 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = iep_TrancheCLoanMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Revolving Credit Facility [Member] | Automotive Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility, unused borrowing availability |  | 550 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  | 540 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember
Line of Credit Facility Aggregate Principal Amount Upon Acceleration | 700 iep_LineofCreditFacilityAggregatePrincipalAmountUponAcceleration / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |  |
Letter of Credit [Member] | Automotive Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Letters of credit outstanding | 34 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 39 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |
Revolving Credit Facility [Member] | Automotive Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility, unused borrowing availability | $ 516 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | $ 550 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |  |
Revolving Credit Facility [Member] | Debt Facility [Member] | Automotive Segment [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit, refinancing indebtedness due, period | 91 days |  |  |  |

X
- Definition Amount deposited in term letter of credit account under credit facility + References No definition available. + Details
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Balance Type: | debit
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X
- Definition Line of Credit Facility Aggregate Principal Amount Upon Acceleration + References No definition available. + Details
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- Definition Line of credit, refinancing indebtedness due, period + References No definition available. + Details
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X
- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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X
- Details
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Balance Type: | na
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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 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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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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Balance Type: | credit
Period Type: | instant

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Balance Type: |
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