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Summary of Significant Accounting Policies Narrative (Details) (USD $) | 12 Months Ended | 8 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2012
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | $ 1,435,000,000 us-gaap_RestrictedCashAndCashEquivalents | $ 396,000,000 us-gaap_RestrictedCashAndCashEquivalents |  |
Debt | 11,588,000,000 us-gaap_DebtAndCapitalLeaseObligations | 9,295,000,000 us-gaap_DebtAndCapitalLeaseObligations |  |
Fair value of long-term debt | 11,600,000,000 us-gaap_LongTermDebtFairValue | 9,400,000,000 us-gaap_LongTermDebtFairValue |  |
Restricted cash [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 1,300,000,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = iep_RestrictedCashMember | 330,000,000 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = iep_RestrictedCashMember |  |
Automotive Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 0 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 0 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Debt | 2,690,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 2,586,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |  |
Research and development expense | 192,000,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 177,000,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember | 179,000,000 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = iep_AutomotiveSegmentMember |
Energy Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Inventory Adjustments | 37,000,000 us-gaap_InventoryAdjustments / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 0 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 0 us-gaap_RestrictedCashAndCashEquivalents / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |
Debt | 675,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember | 676,000,000 us-gaap_DebtAndCapitalLeaseObligations / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |
Maximum [Member] | Refineries [Member] | Energy Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Planned major maintenance, frequency (in years) | 5 years |  |  |
Maximum [Member] | Nitrogen Fertilizer [Member] | Energy Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Planned major maintenance, frequency (in years) | 3 years |  |  |
Minimum [Member] | Refineries [Member] | Energy Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Planned major maintenance, frequency (in years) | 4 years |  |  |
Minimum [Member] | Nitrogen Fertilizer [Member] | Energy Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Planned major maintenance, frequency (in years) | 2 years |  |  |
Machinery, Equipment, and Furniture [Member] | Maximum [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) | 40 years |  |  |
Machinery, Equipment, and Furniture [Member] | Minimum [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) | 1 year |  |  |
Assets Leased to Others [Member] | Maximum [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) | 30 years |  |  |
Assets Leased to Others [Member] | Minimum [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) | 25 years |  |  |
Building and Improvements [Member] | Maximum [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) | 40 years |  |  |
Building and Improvements [Member] | Minimum [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, useful life (in years) | 4 years |  |  |
Refineries [Member] | Coffeyville refinery [Member] | Energy Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Planned major maintenance | 6,000,000 iep_Plannedmajormaintenance / iep_PropertyLocationAxis = iep_CoffeyvillerefineryMember / iep_ReportingUnitAxis = naics_ZZ324110 / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  |
Refineries [Member] | Wynnewood refinery [Member] | Energy Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Planned major maintenance | 1,000,000 iep_Plannedmajormaintenance / iep_PropertyLocationAxis = iep_WynnewoodrefineryMember / iep_ReportingUnitAxis = naics_ZZ324110 / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember |  |  | 102,000,000 iep_Plannedmajormaintenance / iep_PropertyLocationAxis = iep_WynnewoodrefineryMember / iep_ReportingUnitAxis = naics_ZZ324110 / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Nitrogen Fertilizer [Member] | Energy Segment [Member] |  |  |  |
Schedule of Significant Accounting Policies [Line Items] |  |  |  |
Planned major maintenance |  |  |  | $ 5,000,000 iep_Plannedmajormaintenance / iep_ReportingUnitAxis = naics_ZZ325311 / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember

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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Certain changes made in the current period to the value and amount of inventory reported. + 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 210.5-02.6(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 6 -Subparagraph b -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360613&loc=d3e4492-108314 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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