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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 $ 1,435,000,000us-gaap_RestrictedCashAndCashEquivalents $ 396,000,000us-gaap_RestrictedCashAndCashEquivalents    
Debt 11,588,000,000us-gaap_DebtAndCapitalLeaseObligations 9,295,000,000us-gaap_DebtAndCapitalLeaseObligations    
Fair value of long-term debt 11,600,000,000us-gaap_LongTermDebtFairValue 9,400,000,000us-gaap_LongTermDebtFairValue    
Restricted cash [Member]        
Schedule of Significant Accounting Policies [Line Items]        
Cash held at consolidated affiliated partnerships and restricted cash 1,300,000,000us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis
= iep_RestrictedCashMember
330,000,000us-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 0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Debt 2,690,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
2,586,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
   
Research and development expense 192,000,000us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
177,000,000us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
179,000,000us-gaap_ResearchAndDevelopmentExpense
/ us-gaap_StatementBusinessSegmentsAxis
= iep_AutomotiveSegmentMember
 
Energy Segment [Member]        
Schedule of Significant Accounting Policies [Line Items]        
Inventory Adjustments 37,000,000us-gaap_InventoryAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
     
Cash held at consolidated affiliated partnerships and restricted cash 0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
   
Debt 675,000,000us-gaap_DebtAndCapitalLeaseObligations
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
676,000,000us-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 6,000,000iep_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 1,000,000iep_Plannedmajormaintenance
/ iep_PropertyLocationAxis
= iep_WynnewoodrefineryMember
/ iep_ReportingUnitAxis
= naics_ZZ324110
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember
    102,000,000iep_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       $ 5,000,000iep_Plannedmajormaintenance
/ iep_ReportingUnitAxis
= naics_ZZ325311
/ us-gaap_StatementBusinessSegmentsAxis
= iep_EnergySegmentMember