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Related Party Transactions (Details) (USD $) | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended |  |  | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 0 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Icahn Capital [Member] Investment Funds [Member] Expense sharing agreement [Member] | Sep. 30, 2013 Icahn Capital [Member] Investment Funds [Member] Expense sharing agreement [Member] | Sep. 30, 2014 Icahn Capital [Member] Investment Funds [Member] Expense sharing agreement [Member] | Sep. 30, 2013 Icahn Capital [Member] Investment Funds [Member] Expense sharing agreement [Member] | Sep. 30, 2014 Federal-Mogul [Member] | Dec. 06, 2013 Federal-Mogul [Member] Principal Owners and Affiliates [Member] | Sep. 30, 2014 Investment Funds [Member] Principal Owners and Affiliates [Member] | Dec. 31, 2013 Investment Funds [Member] Principal Owners and Affiliates [Member] | Sep. 30, 2014 Investment Funds [Member] Principal Owners and Affiliates [Member] Investment in Funds [Member] | Dec. 31, 2013 Investment Funds [Member] Principal Owners and Affiliates [Member] Investment in Funds [Member] | Sep. 30, 2014 ARI [Member] | Sep. 30, 2014 ARI [Member] ACF [Member] Railcar Sales [Member] | Sep. 30, 2013 ARI [Member] ACF [Member] Railcar Sales [Member] | Sep. 30, 2014 ARI [Member] ACF [Member] Railcar Sales [Member] | Sep. 30, 2013 ARI [Member] ACF [Member] Railcar Sales [Member] | Sep. 30, 2014 AEP Leasing [Member] ACF [Member] | Sep. 30, 2014 AEP Leasing [Member] ACF [Member] Railcar Sales [Member] | Sep. 30, 2013 AEP Leasing [Member] ACF [Member] Railcar Sales [Member] | Sep. 30, 2014 AEP Leasing [Member] ACF [Member] Railcar Sales [Member] | Sep. 30, 2013 AEP Leasing [Member] ACF [Member] Railcar Sales [Member] | Sep. 30, 2014 AEP Leasing [Member] ACF [Member] Purchase of railcars [Member] | Sep. 30, 2014 Investment Segment [Member] Principal Owners and Affiliates [Member] | Oct. 02, 2013 Railcar Segment [Member] New ARL [Member] [Member]
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment segment contributions | $ 500,000,000 | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (500,000,000) |
Related party transaction, balance |  |  |  |  |  |  |  |  |  |  | 5,400,000,000 | 4,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage fair value of investments in Funds that is attributable to Mr. Icahn |  |  |  |  |  |  |  |  | 53.00% | 56.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses charged by related party |  |  | 36,000,000 | 40,000,000 | 138,000,000 | 79,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Funding Commitment, Total Amount |  |  |  |  |  |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Other Revenues from Transactions with Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 | 3,000,000 | 16,000,000 | 7,000,000 |  |  |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,050 |  |
Related Party Transaction, Expenses from Transactions with Related Party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 | 20,000,000 | 99,000,000 | 25,000,000 |  |  |
Unrecorded Unconditional Purchase Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |
Option to purchase additinal railcars, number of cars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |
Option to purchase additional railcars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |  |  |
Railcars purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 296 |  |  |  |  |  |  |
Purchase price of railcars |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,000,000 |  |  |  |  |  |  |
Percentage of equity ownership in subsidiary |  |  |  |  |  |  | 80.70% |  |  |  |  |  | 55.60% |  |  |  |  |  |  |  |  |  |  |  | 75.00%

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