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Description of Business (Details) $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2019 | Jan. 29, 2019 USD ($) | Dec. 05, 2018 USD ($) | Oct. 01, 2018 USD ($) shares | Aug. 01, 2018 USD ($) shares | Oct. 31, 2020 USD ($) shares | Aug. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 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) | $ (5)
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  | $ (17) | 253 | 84
Proceeds from disposition of businesses and assets |  |  |  |  |  |  |  |  |  | 25 | 505 | 3,370
Energy Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  | (7) | 4 | (6)
Automotive Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  | (6) | (4) | (1)
Food Packaging Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  | 0 |  |
Real Estate Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  | $ 89 |  |  | (5) |  | 89
Proceeds from disposition of businesses and assets |  |  |  |  |  |  | $ 179 |  |  |  |  |
Railcar Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  | 0 |  | 5
Mining Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  | 0 | $ 252 | (3)
Pharma Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  | $ 0 |  |
Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  | 99.00% |  |
General partner ownership percentage in Icahn Enterprises |  |  |  |  |  |  |  |  |  | 1.00% |  |
Aggregate general partner ownership interest of parent and operating subsidiary |  |  |  |  |  |  |  |  |  | 1.00% |  |
Affiliate ownership interest |  |  |  |  |  |  |  |  |  | 99.00% |  |
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 |  |  |  |  |  |
Viskase | Food Packaging Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  |  | 79.00% | 75.00% |
Investment Funds |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fair value of investment in subsidiary |  |  |  |  |  |  |  |  |  | $ 4,300 | $ 4,300 |
Mr. Icahn and affiliates |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Affiliate ownership interest |  |  |  |  |  |  |  |  |  | 92.00% |  |
CVR Refining | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase of additional interests in consolidated subsidiaries |  | $ 241 |  |  |  |  |  |  |  |  |  |
Common units validly tendered and not properly withdrawn | shares |  |  |  |  | 21,625,106 |  |  |  |  |  |  |
CVR Energy | Energy Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity issued to acquire additional interest in consolidated subsidiary (number of units) | shares |  |  |  |  | 13,699,549 |  |  |  |  |  |  |
Change in equity as a result of acquisition of additional interest in consolidated subsidiary |  |  |  |  | $ 99 |  |  |  |  |  |  |
Viskase | Food Packaging Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from rights offering |  |  |  |  |  |  |  | $ 50 |  |  |  |
Contribution to subsidiary |  |  |  |  |  |  |  | $ 44 |  |  |  |
ARL | Railcar Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  |  | 5
aggregate consideration for business disposed of |  |  |  |  |  |  |  |  | $ 17 |  |  | $ 17
Ferrous Resources | Mining Segment |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  |  |  | $ 252 |
Proceeds from disposition of businesses and assets |  |  |  |  |  |  |  |  |  | $ 463 |  |
Aggregate consideration for business to be disposed of |  |  | $ 550 |  |  |  |  |  |  |  |  |
Federal-Mogul |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  | 251 |  |  |
Proceeds from disposition of businesses and assets |  |  |  | $ 800 |  |  |  |  |  |  |  |
consideration in shares for business disposed of | shares |  |  |  | 29,500,000 |  |  |  |  |  |  |  |
consideration in non-voting shares for business disposed of | shares |  |  |  | 23,800,000 |  |  |  |  |  |  |  |
consideration in voting shares for business disposed of | shares |  |  |  | 5,700,000 |  |  |  |  |  |  |  |
fair market value of shares obtained as consideration for business disposed of |  |  |  | $ 1,200 |  |  |  |  |  |  |  |
Tropicana |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  | 779 |  |  |
Proceeds from disposition of businesses and assets |  |  |  | 1,500 |  |  |  |  |  |  |  |
aggregate consideration for business disposed of |  |  |  | $ 1,800 |  |  |  |  |  |  |  |
ARI |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
(Loss) gain on disposition of assets, net |  |  |  |  |  |  |  |  | $ 400 |  |  |
Proceeds from disposition of businesses and assets |  |  | $ 831 |  |  |  |  |  |  |  |  |
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 |  |
Contingent Liability |  |  |  |  |  |  |  |  |  | 3 |  |
Consideration Including Exit policy |  |  |  |  |  |  |  |  |  | 81 |  |
Repayments of Debt |  |  |  |  |  |  |  |  |  | $ 63 |  |

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