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Commitments and Contingencies Energy Minimum Required Payments Table (Details) (Energy Segment [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 bbl
CVR Energy, Inc. [Member]
Loss Contingencies [Line Items]
2015	$ 126us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
2016	109us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
2017	107us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
2018	106us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFourthAnniversary / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
2019	105us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Thereafter	718us-gaap_UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember
Total future minimum payments for unconditional purhcase obligations	1,271us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount / dei_LegalEntityAxis = iep_CvrEnergyIncMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember	[1]
Petroleum Transportation [Member] | CRRM [Member]
Loss Contingencies [Line Items]
Unconditional purchase obligation for petroleum transportation, payable ratably over nine years	$ 800iep_UnrecordedUnconditionalPurchaseObligationsDueRatablyOverNineYears / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = iep_PetroleumTransportationMember
Term of unconditional purchase obligation for petroleum transportation	20 years
Number of barrels of petroleum to be transported pursuant to unconditional purchase obligation	25,000iep_UnrecordedUnconditionalPurchaseObligationsNumberOfBarrelsToBeTransported / dei_LegalEntityAxis = iep_CrrmMember / us-gaap_StatementBusinessSegmentsAxis = iep_EnergySegmentMember / us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis = iep_PetroleumTransportationMember
[1] This amount includes $800 million payable ratably over sixteen years pursuant to petroleum transportation service agreements between CRRM and each of TransCanada Keystone Limited Partnership and TransCanada Keystone Pipeline, LP (together, "TransCanada"). The purchase obligation reflects the exchange rate between the Canadian dollar and the U.S. dollar as of December 31, 2014, where applicable. Under the agreements, CRRM receives transportation of at least 25,000 barrels per day of crude oil with a delivery point at Cushing, Oklahoma for a term of 20 years on TransCanada's Keystone pipeline system. CRRM began receiving crude oil under the agreements in the first quarter of 2011.

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Unrecorded Unconditional Purchase Obligations, Due Ratably over Nine Years

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

-Paragraph 4

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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-Name Accounting Standards Codification

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Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

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-Publisher FASB

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Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 440

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-Section 50

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