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Fair Value Measurements Other Segments Fair Value (Details) (Other Segments and Holding Company [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Assets [Abstract] |  |  |  |
Derivative contracts, at fair value (asset) | $ 22 us-gaap_DerivativeAssets | [1] | $ 47 us-gaap_DerivativeAssets | [1]
Assets, Fair Value Disclosure | 211 us-gaap_AssetsFairValueDisclosure |  | 288 us-gaap_AssetsFairValueDisclosure |
Liabilities [Abstract] |  |  |  |
Other Liabilities, Fair Value Disclosure | 42 us-gaap_OtherLiabilitiesFairValueDisclosure |  | 50 us-gaap_OtherLiabilitiesFairValueDisclosure |
Derivative contracts at fair value (liability) | 21 us-gaap_DerivativeLiabilities | [2] | 2 us-gaap_DerivativeLiabilities | [2]
Available-for-sale Securities | 111 us-gaap_AvailableForSaleSecurities |  | 186 us-gaap_AvailableForSaleSecurities |
Trading Securities | 78 us-gaap_TradingSecurities |  | 55 us-gaap_TradingSecurities |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 63 us-gaap_LiabilitiesFairValueDisclosure |  | 52 us-gaap_LiabilitiesFairValueDisclosure |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Derivative contracts, at fair value (asset) | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [1] | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [1]
Assets, Fair Value Disclosure | 39 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 75 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Liabilities [Abstract] |  |  |  |
Other Liabilities, Fair Value Disclosure | 0 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 0 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Derivative contracts at fair value (liability) | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [2] | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [2]
Available-for-sale Securities | 1 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 75 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Trading Securities | 38 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Derivative contracts, at fair value (asset) | 22 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [1] | 47 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [1]
Assets, Fair Value Disclosure | 22 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 50 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Liabilities [Abstract] |  |  |  |
Other Liabilities, Fair Value Disclosure | 42 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 50 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Derivative contracts at fair value (liability) | 21 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [2] | 2 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [2]
Available-for-sale Securities | 0 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 3 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Trading Securities | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 0 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | 63 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 52 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets [Abstract] |  |  |  |
Derivative contracts, at fair value (asset) | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [1] | 0 us-gaap_DerivativeAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [1]
Assets, Fair Value Disclosure | 150 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 163 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Liabilities [Abstract] |  |  |  |
Other Liabilities, Fair Value Disclosure | 0 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 0 us-gaap_OtherLiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Derivative contracts at fair value (liability) | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [2] | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember | [2]
Available-for-sale Securities | 110 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 108 us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Trading Securities | 40 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | 55 us-gaap_TradingSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |  | $ 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_StatementBusinessSegmentsAxis = iep_OtherSegmentsAndHoldingCompanyMember |
[1] | Amounts are classified within other assets in our condensed consolidated balance sheets.
[2] | Amounts are classified within accrued expenses and other liabilities in our condensed consolidated balance sheets.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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