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Description of Business (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | Dec. 19, 2016 USD ($)
Description of Business [Line Items] |  |  |  |  |  |
Proceeds from disposition of assets |  |  | $ 1,282,000,000 | $ 11,000,000 |  |
Gain on disposition of assets, net | $ 1,525,000,000 | $ 1,000,000 | $ 1,520,000,000 | 11,000,000 |  |
Icahn Enterprises Holdings |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 99.00% |  |  |
Proceeds from disposition of assets |  |  | $ 1,282,000,000 | 11,000,000 |  |
Gain on disposition of assets, net | 1,525,000,000 | 1,000,000 | 1,520,000,000 | 11,000,000 |  |
Investment Funds |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Fair value of interest in subsidiary | 2,700,000,000 |  | $ 2,700,000,000 |  | $ 1,700,000,000 |
CVR Refining |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 3.90% |  |  |
CVR Energy |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 82.00% |  |  |
ARI |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 62.20% |  |  |
Ferrous Resources |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 77.20% |  |  |
Viskase |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 74.60% |  |  |
Icahn Enterprises G.P. |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  | 1.00% |  |  |
General partner ownership interest in Icahn Enterprises Holdings |  |  | 1.00% |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  |  | 1.99% |  |  |
Mr. Icahn and affiliates |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Affiliate ownership interest in Icahn Enterprises |  |  | 90.60% |  |  |
Gaming Segment |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Gain on disposition of assets, net | 0 | 0 | $ (3,000,000) | 0 |  |
Gaming Segment | Tropicana |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 72.50% |  |  |
Automotive Segment |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Gain on disposition of assets, net | 5,000,000 | 0 | $ 3,000,000 | 9,000,000 |  |
Automotive Segment | Federal-Mogul |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 100.00% |  |  |
Payments to acquire additional interest in subsidiaries |  |  | $ 305,000,000 |  |  |
Energy Segment |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Gain on disposition of assets, net | (1,000,000) | 0 | $ (1,000,000) | 0 |  |
Energy Segment | CVR Refining |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 66.00% |  |  |
Energy Segment | CVR Partners |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 34.00% |  |  |
Railcar Segment |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Value of business to be disposed of |  |  |  |  |  | $ 2,800,000,000
Estimated number of railcars to be disposed of (number of railcars) |  |  |  |  |  | 29,000
Estimated number of additional railcars with option to sell (number of railcars) |  |  |  |  |  | 4,600
Expected future proceeds from sale of assets held for sale |  |  | $ 559,000,000 |  |  |
Gain on disposition of assets, net | 1,521,000,000 | 0 | 1,521,000,000 | 0 |  |
Holding Company |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |
Proceeds from disposition of assets |  |  | 1,300,000,000 |  |  |
Gain on disposition of assets, net | $ 0 | $ 0 | $ 0 | $ 0 |  |

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