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Operating Units (Details) (USD $) | 3 Months Ended | 6 Months Ended | 0 Months Ended |  |  | 0 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 1 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  |  | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 0 Months Ended |  | 6 Months Ended | 12 Months Ended | 60 Months Ended |  | 0 Months Ended | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2011 Investment Funds [Member] | Apr. 29, 2011 Investment Funds [Member] | Jun. 30, 2012 Investment Funds [Member] | Dec. 31, 2011 Investment Funds [Member] | Jun. 30, 2011 Investment Funds [Member] Exit Facility [Member] | Jun. 30, 2012 ARI [Member] | Apr. 30, 2012 Federal-Mogul [Member] | Feb. 29, 2012 Federal-Mogul [Member] | Jun. 30, 2012 Federal-Mogul [Member] | Jun. 30, 2011 Federal-Mogul [Member] | Jun. 30, 2012 Federal-Mogul [Member] | Jun. 30, 2011 Federal-Mogul [Member] | Dec. 31, 2011 Federal-Mogul [Member] | Jun. 30, 2012 CVR Energy, Inc. [Member] | Apr. 30, 2011 Tropicana [Member] | Nov. 30, 2010 Tropicana [Member] | Jun. 30, 2012 Tropicana [Member] casinos sqft slot_machines table_games hotel_rooms | Nov. 15, 2010 Tropicana [Member] | Dec. 29, 2009 Tropicana [Member] Exit Facility [Member] | Jun. 30, 2012 Viskase [Member] distribution_centers manufacturing_facilities | Jun. 30, 2012 Real Estate [Member] real_estate_properties | Dec. 31, 2011 Real Estate [Member] | Jun. 30, 2012 WestPoint Home [Member] Top five customers [Member] | Jun. 30, 2011 WestPoint Home [Member] Top five customers [Member] | Jun. 30, 2012 NEVADA Tropicana [Member] casinos | Jun. 30, 2012 MISSISSIPPI Tropicana [Member] casinos | Jun. 30, 2012 INDIANA Tropicana [Member] casinos | Jun. 30, 2012 LOUISIANA Tropicana [Member] casinos | Jun. 30, 2012 NEW JERSEY Tropicana [Member] casinos | Jun. 30, 2012 ARUBA Tropicana [Member] casinos | Jun. 30, 2012 MASSACHUSETTS Real Estate [Member] real_estate_property_units | Jun. 30, 2012 FLORIDA Real Estate [Member] real_estate_property_units | Jun. 30, 2012 Energy Segment [Member] | Jun. 30, 2012 Energy Segment [Member] | May 04, 2012 Energy Segment [Member] CVR Partners, LP [Member] | Jun. 30, 2012 Energy Segment [Member] Crude Oil Gathering [Member] | Jun. 30, 2012 Energy Segment [Member] Nitrogen Fertilizer [Member] T | Dec. 31, 2011 Energy Segment [Member] Nitrogen Fertilizer [Member] T | Jun. 30, 2012 Energy Segment [Member] Nitrogen Fertilizer [Member] T | Jun. 30, 2012 Coffeyville, Kansas [Member] Energy Segment [Member] Petroleum [Member] bbl | Jun. 30, 2012 Coffeyville, Kansas [Member] Energy Segment [Member] Pipeline Transportation of Crude Oil [Member] miles | Jun. 30, 2012 Wynnewood, Oklahoma [Member] Energy Segment [Member] Petroleum [Member] bbl | Jun. 30, 2012 Cushing, Oklahoma [Member] Energy Segment [Member] Petroleum [Member] bbl | Jul. 02, 2012 Pending Business Acquisition [Member] Federal-Mogul [Member] | Jun. 30, 2012 PHILIPPINES Viskase [Member] | Jun. 30, 2012 Employee Severance [Member] Federal-Mogul [Member] | Jun. 30, 2012 Facility Closing [Member] Federal-Mogul [Member]
Operting Unit Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special Profit Interest Allocation |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive Allocation |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment in Funds |  |  |  |  |  |  |  | 2,100,000,000 | 3,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in subsidiary |  |  |  |  |  |  |  |  |  |  | 55.60% |  |  |  |  | 77.20% |  |  | 76.80% |  | 51.50% | 65.10% |  |  | 71.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |
Gross accounts receivable factored |  |  |  |  |  |  |  |  |  |  |  |  |  | 207,000,000 |  | 207,000,000 |  | 203,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross accounts receivable factored, qualifying as sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 207,000,000 |  | 207,000,000 |  | 202,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding transferred receivables for which cash had not yet been drawn |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from factoring qualifying as sales |  |  |  |  |  |  |  |  |  |  |  |  |  | 363,000,000 | 510,000,000 | 776,000,000 | 923,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable discount expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 3,000,000 | 3,000,000 | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum exposures to accounts receivable factoring and securitization facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  | 23,000,000 |  | 23,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges | 9,000,000 | 1,000,000 |  | 16,000,000 | 4,000,000 |  |  |  |  |  |  |  |  | 8,000,000 | 0 | 14,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [1] | 0 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,000,000 | 11,000,000
Cash advances from insurance carrier |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance recoverables |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 21,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Expected Annualized Revenue Increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000,000 |  |  |
Barrels per day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000 |  |  |  | 115,000 | 145,000 | 70,000 |  |  |  |  |
Crude oil pipeline, length, miles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350 |  |  |  |  |  |
Storage capacity, barrels of oil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |  | 500,000 | 1,000,000 |  |  |  |
Production, Barrels of Oil, Leased Storage Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,300,000 |  |  |  |
Tons of ammonia per day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,225 |  | 1,225 |  |  |  |  |  |  |  |
Tons of UAN per day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,025 |  | 2,025 |  |  |  |  |  |  |  |
Cubic feet of hydrogen per day |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,000,000 |  | 84,000,000 |  |  |  |  |  |  |  |
Tons of ammonia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 411,189 |  |  |  |  |  |  |  |  |
Ammonia upgraded into UAN, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72.00% |  |  |  |  |  |  |  |  |
Tons of UAN |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 714,130 |  |  |  |  |  |  |  |  |
Plant expansion program, term, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Planned annual increase in UAN production, next two years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  | 400,000 |  |  |  |  |  |  |  |
Planned annual increase in UAN production, next two years, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  | 50.00% |  |  |  |  |  |  |  |
Percentage of pet coke utilized by nitrogen fertlizer plant produced and supplied by subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |
Number of casinos operated by subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  | 3 | 1 | 1 | 1 | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Square feet of gaming space |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 381,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of slot machines |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,128 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of table games |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of hotel rooms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,045 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of stock acquired in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 668,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of subsidiary stock owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,538,446 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution-in-kind received, shares |  |  |  |  |  |  | 13,538,446 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution-in-kind received, value |  |  |  |  |  |  | 216,000,000 |  |  | 71,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption value of limited and general partnership interest in subsidiary |  |  |  |  |  | 71,000,000 | 216,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Additional Interest Issued to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Non-controlling Interest, Changes, Due to additional interests acquired by controlling enity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loans held by related entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing facilities operated by subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution centers operated by subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net sales from customers located outside the United States |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital investment, including machinery | 232,000,000 | 103,000,000 |  | 429,000,000 | 218,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,000,000 | [1] | 31,000,000 | [1] |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Total capital investment to date on project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,000,000 |  |
Anticipated additional equipment expenditures for remainder of 2012 through December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Number of rental real estate properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units of Residential Housing in Future Development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 324 | 870 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pledged net investment in financing leases and net rental real estate leasted to others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 | $ 77,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of subsidiary net sales attributable to top customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 61.00% | 52.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | We consolidated CVR effective May 4, 2012.

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- Definition Advance on Insurance Recoverable received during period + References No definition available. + Details
Name: | iep_AdvanceOnInsuranceRecoverable
Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Business Acquisition, Expected Annualized Revenue Increase + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Casino space, square footage + References No definition available. + Details
Name: | iep_CasinoSpaceSquareFootage
Namespace Prefix: | iep_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents reduction of non-controlling interest due to a (noncash) issuance of additional equity interests to the parent by a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent and non-controlling interest. The additional equity interest represented by this element increases the parent's controlling interest in the subsidiary and decreases non-controlling interests. + References No definition available. + Details
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Namespace Prefix: | iep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Crude Oil Pipeline, Length, Miles + References No definition available. + Details
Name: | iep_CrudeOilPipelineLengthMiles
Namespace Prefix: | iep_
Data Type: | xbrli:integerItemType
Balance Type: | na
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