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Related Party Transactions (Details) (USD $) |  |  |  |  | 12 Months Ended |  | 12 Months Ended | 8 Months Ended | 3 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended | 0 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member] | Dec. 31, 2011 Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member] | Dec. 31, 2012 Principal Owners and Affiliates [Member] Non-exclusive use of office space expense [Member] | Dec. 31, 2011 Principal Owners and Affiliates [Member] Non-exclusive use of office space expense [Member] | Dec. 31, 2010 Principal Owners and Affiliates [Member] Non-exclusive use of office space expense [Member] | Dec. 31, 2012 ARL [Member] | Dec. 31, 2012 XO Holdings [Member] Telecommunication Services [Member] | Dec. 31, 2011 XO Holdings [Member] Telecommunication Services [Member] | Dec. 31, 2010 XO Holdings [Member] Telecommunication Services [Member] | Dec. 31, 2012 Icahn Capital [Member] Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member] | Dec. 31, 2011 Icahn Capital [Member] Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member] | Dec. 31, 2010 Icahn Capital [Member] Principal Owners and Affiliates [Member] Expense Sharing Agreement [Member] | Dec. 31, 2012 Icahn Capital [Member] Principal Owners and Affiliates [Member] Investment-Related Expenses [Member] | Dec. 31, 2011 Icahn Capital [Member] Principal Owners and Affiliates [Member] Investment-Related Expenses [Member] | Dec. 31, 2010 Icahn Capital [Member] Principal Owners and Affiliates [Member] Investment-Related Expenses [Member] | Dec. 31, 2012 Icahn Capital [Member] Investment Funds [Member] Expense Sharing Agreement [Member] | Dec. 31, 2011 Icahn Capital [Member] Investment Funds [Member] Expense Sharing Agreement [Member] | May 07, 2012 IEP Energy [Member] Principal Owners and Affiliates [Member] | Dec. 31, 2012 CVR Energy, Inc. [Member] | Dec. 31, 2012 CVR Partners, LP [Member] ARL [Member] Railcar lease expense [Member] | Jun. 30, 2012 Investment Funds [Member] Principal Owners and Affiliates [Member] | Dec. 31, 2012 Investment Funds [Member] Principal Owners and Affiliates [Member] | Dec. 31, 2011 Investment Funds [Member] Principal Owners and Affiliates [Member] | Dec. 31, 2012 ARI [Member] | Dec. 31, 2012 ARI [Member] ARL [Member] | Dec. 31, 2011 ARI [Member] ARL [Member] | Dec. 31, 2012 ARI [Member] ARL [Member] Railcar Services [Member] | Dec. 31, 2011 ARI [Member] ARL [Member] Railcar Services [Member] | Dec. 31, 2010 ARI [Member] ARL [Member] Railcar Services [Member] | Dec. 31, 2012 ARI [Member] ARL [Member] Railcars Sales [Member] | Dec. 31, 2011 ARI [Member] ARL [Member] Railcars Sales [Member] | Dec. 31, 2010 ARI [Member] ARL [Member] Railcars Sales [Member] | Dec. 31, 2012 ARI and AEP Leasing [Member] ARL [Member] Railcar Managment Fees [Member] | Dec. 31, 2011 ARI and AEP Leasing [Member] ARL [Member] Railcar Managment Fees [Member] | Dec. 31, 2012 Icahn Enterprises Holdings [Member] | Dec. 31, 2011 Icahn Enterprises Holdings [Member] | Dec. 31, 2012 Icahn Enterprises Holdings [Member] Principal Owners and Affiliates [Member] Professional Fees [Member] | Dec. 31, 2011 Icahn Enterprises Holdings [Member] Principal Owners and Affiliates [Member] Professional Fees [Member] | Dec. 31, 2010 Icahn Enterprises Holdings [Member] Principal Owners and Affiliates [Member] Professional Fees [Member] | Dec. 31, 2012 Principal Owners and Affiliates [Member] | May 07, 2012 Principal Owners and Affiliates [Member] IEP Energy [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses charged by related party |  |  |  |  | $ 3,000,000 | $ 2,000,000 | $ 2,000,000 |  | $ 1,000,000 | $ 1,000,000 | $ 1,000,000 | $ 2,000,000 | $ 1,000,000 | $ 2,000,000 | $ 4,000,000 | $ 2,000,000 | $ 3,000,000 | $ 23,000,000 | $ 21,000,000 |  |  | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 | $ 3,000,000 | $ 2,000,000 |  |
Liability balances due to related party |  |  | 1,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000,000 | 3,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of deferred management fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 192,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred management fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 188,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions by non-controlling interests in subsidiary (Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,566,546 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital contributions by non-controlling interests in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93.20% | 6.40%
Percentage of equity ownership in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 82.00% |  |  |  |  | 55.60% |  |  |  |  |  |  |  |  |  |  | 99.00% |  |  |  |  |  |
Term of service agreement (in years) |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal period of service agreement (in years) |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Written notice requirment period to terminate services agreement (in days) |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Other Revenues from Transactions with Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,000,000 | 25,000,000 | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Revenue from Related Parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,000,000 | 1,000,000 | 82,000,000 |  |  |  |  |  |  |  |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 | 300,000 |  |  |  |  |  |  |
Accounts receivable due from related parties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other liabilities | $ 1,496,000,000 | $ 1,317,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,496,000,000 | $ 1,317,000,000 | $ 1,000,000 | $ 1,000,000 |  |  |

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