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(Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 27, 2018 | Aug. 31, 2018 | Jan. 31, 2018 | Aug. 31, 2017 | Jan. 31, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 22, 2018 | Oct. 01, 2018
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  | $ 65 | $ 446 | $ 65 | $ 1,969 |  |  |  |
Proceeds from disposition of assets |  |  |  |  |  |  |  |  | 160 | 1,405 |  |  |  |
Seller financing secured mortgages resulting from disposition of assets |  |  |  |  |  |  |  |  | 0 | 375 |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  |  |  |  |  | $ 0 | 349 |  |  |  |
Icahn Enterprises Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  | 99.00% |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  | 65 | 446 | $ 65 | 1,969 |  |  |  |
Proceeds from disposition of assets |  |  |  |  |  |  |  |  | 160 | 1,405 |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  |  |  |  |  | 0 | $ 349 |  |  |  |
Investment Funds |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of interest in subsidiary |  |  |  |  |  |  | 3,000 |  | $ 3,000 |  | $ 3,000 |  |  |
Federal-Mogul |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  | 100.00% |  |  | 82.00% |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  | $ 305 |  |  |  |  |  |  |  |  |
CVR Refining |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  | 3.90% |  |  |  |  |
Common units validly tendered and not properly withdrawn (common units) | 21,625,106 |  |  |  |  |  |  |  |  |  |  |  |  |
CVR Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary | 70.80% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary common stock issued in exchange for additional interest in CVRR (shares) | 13,699,549 |  |  |  |  |  |  |  |  |  |  |  |  |
ARI |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  | 62.20% |  |  |  |  |
Tropicana |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  | 83.90% | 72.50% |  |  |  |
Subsidiary repurchase of treasury stock |  |  |  |  |  |  |  |  | $ 36 |  |  |  |  |
Payments to acquire additional interest in subsidiaries |  |  |  |  |  |  |  |  | $ 95 |  |  |  |  |
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 |  |  |  |  |  |  |  |  | 78.60% |  | 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 |  |  |  |  |  |  |  |  | 91.50% |  |  |  |  |
Energy Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  | 0 | (1) | $ (5) | $ (2) |  |  |  |
Energy Segment | CVR Refining |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  |  |  |  |  |  |  | 81.00% |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  | 0 | (10) | $ 5 | 1,511 |  |  |  |
Holding Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |
Proceeds from disposition of assets |  |  |  |  |  |  |  |  |  | 1,300 |  |  |  |
Food Packaging Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |
Food Packaging Segment | Viskase |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from subsidiary rights offering |  |  | $ 50 |  |  |  |  |  |  |  |  |  |  |
Payments for additional investment in subsidiary |  |  | $ 44 |  |  |  |  |  |  |  |  |  |  |
Real Estate Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration received from sale of asset |  | $ 139 |  | $ 600 |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  |  | $ 67 | $ 456 | $ 67 | $ 456 |  |  |  |
Proceeds from disposition of assets |  |  |  | 225 |  |  |  |  |  |  |  |  |  |
Seller financing secured mortgages resulting from disposition of assets |  |  |  | 375 |  |  |  |  |  |  |  |  |  |
Subsequent event | Federal-Mogul |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration to be received for business to be disposed of |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800
Total equity consideration to be received for business to be disposed of (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,500,000
fair market value of shares obtained as consideration for business to be disposed of |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200
Non-voting equity consideration to be received for business to be disposed of (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,800,000
consideration in voting shares for business to be disposed of |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,700,000
investment, ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00%
Subsequent event | Tropicana |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate consideration for business to be disposed of |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,800
Cash consideration to be received for business to be disposed of |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500
Subsequent event | Federal-Mogul and Tropicana |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Subsequent event | Railcar Segment | ARI |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration to be received for business to be disposed of |  |  |  |  |  |  |  |  |  |  |  |  | $ 831 |
termination clause |  |  |  |  |  |  |  |  |  |  |  |  | 65 |
Subsequent event | Railcar Segment | ITE Rail Fund L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
termination clause |  |  |  |  |  |  |  |  |  |  |  |  | $ 130 |
Dallas Property | Real Estate Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  | $ 67 |  |  |  |  |  |  |  |  |  |  |  |
Fountainebleu | Real Estate Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of assets, net |  |  |  | 456 |  |  |  |  |  |  |  |  |  |
First Mortgage | Real Estate Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller financing secured mortgages resulting from disposition of assets |  |  |  | 345 |  |  |  |  |  |  |  |  |  |
Second Mortgage | Real Estate Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller financing secured mortgages resulting from disposition of assets |  |  |  | $ 30 |  |  |  |  |  |  |  |  |  |

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