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Description of Business (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) product item company | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Description Of Business [Line Items] |  |  |
Number of operating companies | company | 2 |  |
Proceeds from disposition of businesses and assets | $ 34 | $ 8 |
Icahn Enterprises Holdings |  |  |
Description Of Business [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 99.00% |  |
CVR Refining |  |  |
Description Of Business [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 36.00% |  |
Viskase | Private Placement |  |  |
Description Of Business [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 89.00% |  |
Icahn Enterprises Holdings |  |  |
Description Of Business [Line Items] |  |  |
Proceeds from disposition of businesses and assets | $ 34 | $ 8 |
Investment Funds |  |  |
Description Of Business [Line Items] |  |  |
Fair value of interest in subsidiary | $ 4,700 |  | $ 4,300
Icahn Enterprises G.P. |  |  |
Description Of Business [Line Items] |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.99% |  |
Icahn Enterprises G.P. | Icahn Enterprises Holdings |  |  |
Description Of Business [Line Items] |  |  |
General partner ownership percentage in Icahn Enterprises | 1.00% |  |
Mr. Icahn and affiliates | Icahn Enterprises Holdings |  |  |
Description Of Business [Line Items] |  |  |
Affiliate ownership interest in Icahn Enterprises | 90.00% |  |
Energy Segment | CVR Energy |  |  |
Description Of Business [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 71.00% |  |
Pharma Segment | Vivus |  |  |
Description Of Business [Line Items] |  |  |
Number of approved therapies | item | 2 |  |
Number of product candidate in active clinical development | product | 1 |  |

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