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Debt Narrative - Senior Unsecured Notes - Icahn Enterprises (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jan. 29, 2014 | Aug. 01, 2013 | Jan. 15, 2010 | Jan. 21, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt | $ 2 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 126 us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |
Senior unsecured notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Additional indebtedness allowed per debt covenants | 792 iep_AdditionalIndebtednessAllowedPerDebtCovenants / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |  |  |
Senior unsecured notes [Member] | 2022 Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term Loan Facility |  |  | 1,350 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |
Proceeds from Issuance of Debt |  |  | 1,340 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |
Senior unsecured notes [Member] | 2020 Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term Loan Facility |  |  |  | 500 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |
Interest rate, long-term debt |  |  |  |  | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |
Proceeds from Issuance of Debt |  |  | 493 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |
Senior unsecured notes [Member] | Additional 2020 Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  | 1,200 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_Additional2020NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Interest rate, long-term debt |  |  | 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_Additional2020NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |
Proceeds from Issuance of Debt |  |  | 1,217 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_Additional2020NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |
Senior unsecured notes [Member] | 2019 Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  | 1,275 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Interest rate, long-term debt |  |  |  |  | 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |
Proceeds from Issuance of Debt |  |  | 1,269 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |
Senior unsecured notes [Member] | 2017 Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  | 1,175 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember
Interest rate, long-term debt |  |  |  |  | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |
Proceeds from Issuance of Debt |  |  | 1,169 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |
Senior unsecured notes [Member] | 2010-2012 Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Use of portion of debt proceeds |  | 3,500 iep_UseOfPortionOfDebtProceeds / us-gaap_DebtInstrumentAxis = iep_A20102012NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |  |
Loss on extinguishment of debt |  | 108 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = iep_A20102012NotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |  |
Icahn Enterprises Holdings [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt | $ 2 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | $ 126 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember |  |  |  |

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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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