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Debt Narrative - Senior Unsecured Notes - Icahn Enterprises and Icahn Enterprises Holdings (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 0 Months Ended |  |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 29, 2014 | Jan. 15, 2010 | Jan. 24, 2014 | Nov. 12, 2010 | Jan. 21, 2014 | Aug. 01, 2013 | Jul. 02, 2012
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | $ (162)us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 0 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ (10)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |  |
Icahn Enterprises Holdings [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt | (162)us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | 0 us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember | (10)us-gaap_GainsLossesOnExtinguishmentOfDebt / dei_LegalEntityAxis = iep_IcahnEnterprisesHoldingsMember |  |  |  |  |  |  |
Holding Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Additional indebtedness allowed per debt covenants | 930 iep_AdditionalIndebtednessAllowedPerDebtCovenants / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |  |  |  |
Holding Company [Member] | 5.875% senior unsecured notes due 2022 - Icahn Enterprises/Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  | 1,350 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | 1,340 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_A2022NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |
Holding Company [Member] | Additional 2020 Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  | 1,200 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_Additional2020NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |
Interest rate, long-term debt |  |  |  | 5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_Additional2020NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | 1,217 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_Additional2020NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |
Holding Company [Member] | 6% senior unsecured notes due 2020 - Icahn Enterprises/Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |  | 500 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |
Interest rate, long-term debt |  |  |  |  | 6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | 493 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_A2020NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |
Holding Company [Member] | Initial Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of senior unsecured notes |  |  |  |  | 1,987 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / us-gaap_DebtInstrumentAxis = iep_InitialNotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |
Holding Company [Member] | 2016 Additional Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  | 200 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2010AdditionalNotesDue2016Member / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |
Holding Company [Member] | 7.75% senior unsecured notes due 2016 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  | 850 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2016NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |
Interest rate, long-term debt |  |  |  |  | 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_A2016NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |
Holding Company [Member] | 8% senior unsecured notes due 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  | 1,150 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2018NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |
Interest rate, long-term debt |  |  |  |  | 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_A2018NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |
Holding Company [Member] | 2012 Additional Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |  |  | 1,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2012AdditionalNotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember
Holding Company [Member] | 4.875% senior unsecured notes due 2019 - Icahn Enterprises/Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  | 1,275 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |
Interest rate, long-term debt |  |  |  |  | 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | 1,269 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_A2019NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |
Holding Company [Member] | 3.50% senior unsecured notes due 2017 - Icahn Enterprises/Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  | 1,175 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |
Interest rate, long-term debt |  |  |  |  | 3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |
Proceeds from Issuance of Debt |  |  |  | 1,169 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = iep_A2017NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |
Holding Company [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_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |
Loss on extinguishment of debt | 108 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = iep_A20102012NotesMember / us-gaap_StatementBusinessSegmentsAxis = iep_HoldingCompanyMember |  |  |  |  |  |  |  |  |
Senior unsecured notes [Member] | 2018 Additional Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Term Loan Facility |  |  |  |  |  |  | 300 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = iep_A2010AdditionalNotesDue2018Member / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |
Senior unsecured notes [Member] | 2010 Additional Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from sale of senior unsecured notes |  |  |  |  |  |  | $ 512 us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt / us-gaap_DebtInstrumentAxis = iep_A2010AdditionalNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorDebtObligationsMember |  |  |

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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 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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