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Description of Business (Details) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 07, 2021 | Jul. 31, 2019 | Jan. 29, 2019 USD ($) | Oct. 31, 2020 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) item segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Description of Business [Line Items] |  |  |  |  |  |  |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  |  |  |  |  | 1.99% |  |
Purchase of additional interests in consolidated subsidiaries |  |  |  |  |  |  |  | $ (241)
Number of Operating Segments | segment |  |  |  |  |  | 2 |  |
Proceeds from disposition of businesses and assets |  |  |  |  |  | $ 414 | $ 25 | 505
Gain (loss) on disposition of assets, net |  |  |  |  |  | 141 | (17) | 253
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | PSC Metals |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Percentage of interest sold | 100.00% |  |  |  |  |  |  |
Proceeds from sale of equity interests |  |  |  |  | $ 163 |  |  |
Pretax gain on disposition of assets |  |  |  |  | 323 | 323 |  |
Energy Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  | (3) | (7) | 4
Automotive Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  | (22) | (6) | (4)
Food Packaging Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  | 0 |  |
Real Estate Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  | 3 | $ (5) |
Mining Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  | 0 |  | $ 252
Pharma Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  | $ 0 |  |
Icahn Enterprises Holdings |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  | 99.00% |  |
Affiliate ownership interest |  |  |  |  |  | 99.00% |  |
Icahn Enterprises Holdings | Icahn Enterprises G.P. |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  |  |  |  | 1.00% |  |
Icahn Enterprises Holdings | Mr. Icahn and affiliates |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Affiliate ownership interest |  |  |  |  |  | 88.00% |  |
Icahn Enterprises G.P. |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
General partner ownership percentage in Icahn Enterprises |  |  |  |  |  | 1.00% |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  |  |  |  |  | 1.99% |  |
Affiliate ownership interest |  |  |  |  |  | 98.01% |  |
Icahn Enterprises G.P. | Mining Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  | 77.00% |  |  |  |  |  |
CVR Refining |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  | 36.00% |  |
CVR Refining | Energy Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 4.00% |  |  |  |  |
CVR Energy | Energy Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 81.00% |  |  | 71.00% |  |
Viskase | Private Placement |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  | 89.00% | 79.00% |
Common stock shares acquired | shares |  |  |  | 50,000,000 |  |  |  |
Amount of common stock shares acquired |  |  |  | $ 100 |  |  |  |
Investment Funds |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Fair value of investment in subsidiary |  |  |  |  | 4,200 | $ 4,200 | $ 4,300 |
CVR Refining | Energy Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Purchase of additional interests in consolidated subsidiaries |  |  | $ 241 |  |  |  |  |
Ferrous Resources | Mining Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Proceeds from disposition of businesses and assets |  |  |  |  |  | $ 463 |  |
Gain (loss) on disposition of assets, net |  |  |  |  |  |  | $ 252 |
Vivus | Pharma Segment |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |
Number Of Approved Therapies | item |  |  |  |  |  | 2 |  |
Number Of Product Candidate In Active Clinical Development | item |  |  |  |  |  | 1 |  |
Fair value of debt securities |  |  |  |  | 183 | $ 183 |  |
Consideration Including Exit policy |  |  |  |  | 81 | 81 |  |
Contingent Liability |  |  |  |  | $ 3 | 3 |  |
Repayments of Debt |  |  |  |  |  | $ 63 |  |

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