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Segment Reporting - Condensed Balance Sheets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 2,218 |  | $ 2,951 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 3,442 |  | 2,995 |  |  |
Investments | 2,306 |  | 3,012 |  |  |
Accounts receivable, net | 494 |  | 485 |  |  |
Inventories, net | 970 |  | 1,047 |  |  |
Related party notes receivable, net | 7 |  | 11 |  |  |
Property, plant and equipment, net | 3,909 |  | 3,969 |  |  |
Goodwill and intangible assets, net | 725 |  | 754 |  |  |
Other assets | 3,917 |  | 5,634 |  |  |
Total assets | 17,988 |  | 20,858 |  |  |
Accounts payable, accrued expenses and other liabilities | 3,849 |  | 4,105 |  |  |
Securities sold, not yet purchased, at fair value | 2,128 |  | 3,473 |  |  |
Debt | 6,625 |  | 7,207 |  |  |
Total liabilities | 12,602 |  | 14,785 |  |  |
Equity attributable to Icahn Enterprises | 2,727 |  | 3,208 |  |  |
Equity attributable to non-controlling interests | 2,659 |  | 2,865 |  |  |
Total equity | 5,386 | $ 5,625 | 6,073 | $ 7,187 | $ 8,496 | $ 9,558
Total Liabilities and Equity | 17,988 |  | 20,858 |  |  |
Investment Segment |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 8 |  | 23 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 3,256 |  | 2,799 |  |  |
Investments | 2,196 |  | 2,898 |  |  |
Other assets | 2,762 |  | 4,425 |  |  |
Total assets | 8,222 |  | 10,145 |  |  |
Accounts payable, accrued expenses and other liabilities | 1,225 |  | 1,312 |  |  |
Securities sold, not yet purchased, at fair value | 2,128 |  | 3,473 |  |  |
Total liabilities | 3,353 |  | 4,785 |  |  |
Equity attributable to Icahn Enterprises | 2,946 |  | 3,243 |  |  |
Equity attributable to non-controlling interests | 1,923 |  | 2,117 |  |  |
Total equity | 4,869 |  | 5,360 |  |  |
Total Liabilities and Equity | 8,222 |  | 10,145 |  |  |
Energy |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 586 |  | 1,179 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash |  |  | 7 |  |  |
Investments | 96 |  | 100 |  |  |
Accounts receivable, net | 298 |  | 286 |  |  |
Inventories, net | 543 |  | 604 |  |  |
Property, plant and equipment, net | 2,542 |  | 2,594 |  |  |
Goodwill and intangible assets, net | 169 |  | 179 |  |  |
Other assets | 288 |  | 310 |  |  |
Total assets | 4,522 |  | 5,259 |  |  |
Accounts payable, accrued expenses and other liabilities | 1,438 |  | 1,553 |  |  |
Debt | 1,584 |  | 2,185 |  |  |
Total liabilities | 3,022 |  | 3,738 |  |  |
Equity attributable to Icahn Enterprises | 785 |  | 795 |  |  |
Equity attributable to non-controlling interests | 715 |  | 726 |  |  |
Total equity | 1,500 |  | 1,521 |  |  |
Total Liabilities and Equity | 4,522 |  | 5,259 |  |  |
Automotive Segment |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 89 |  | 104 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 7 |  | 9 |  |  |
Accounts receivable, net | 34 |  | 41 |  |  |
Inventories, net | 198 |  | 228 |  |  |
Property, plant and equipment, net | 817 |  | 822 |  |  |
Goodwill and intangible assets, net | 331 |  | 335 |  |  |
Other assets | 488 |  | 480 |  |  |
Total assets | 1,964 |  | 2,019 |  |  |
Accounts payable, accrued expenses and other liabilities | 816 |  | 890 |  |  |
Debt | 27 |  | 33 |  |  |
Total liabilities | 843 |  | 923 |  |  |
Equity attributable to Icahn Enterprises | 1,121 |  | 1,096 |  |  |
Total equity | 1,121 |  | 1,096 |  |  |
Total Liabilities and Equity | 1,964 |  | 2,019 |  |  |
Food Packaging Segment |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 5 |  | 8 |  |  |
Accounts receivable, net | 87 |  | 89 |  |  |
Inventories, net | 115 |  | 111 |  |  |
Property, plant and equipment, net | 126 |  | 134 |  |  |
Goodwill and intangible assets, net | 22 |  | 23 |  |  |
Other assets | 94 |  | 101 |  |  |
Total assets | 449 |  | 466 |  |  |
Accounts payable, accrued expenses and other liabilities | 126 |  | 148 |  |  |
Debt | 139 |  | 133 |  |  |
Total liabilities | 265 |  | 281 |  |  |
Equity attributable to Icahn Enterprises | 168 |  | 168 |  |  |
Equity attributable to non-controlling interests | 16 |  | 17 |  |  |
Total equity | 184 |  | 185 |  |  |
Total Liabilities and Equity | 449 |  | 466 |  |  |
Real Estate Segment |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 26 |  | 22 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 3 |  | 4 |  |  |
Investments | 14 |  | 14 |  |  |
Accounts receivable, net | 17 |  | 16 |  |  |
Property, plant and equipment, net | 367 |  | 363 |  |  |
Other assets | 67 |  | 69 |  |  |
Total assets | 494 |  | 488 |  |  |
Accounts payable, accrued expenses and other liabilities | 54 |  | 43 |  |  |
Debt | 1 |  | 1 |  |  |
Total liabilities | 55 |  | 44 |  |  |
Equity attributable to Icahn Enterprises | 434 |  | 439 |  |  |
Equity attributable to non-controlling interests | 5 |  | 5 |  |  |
Total equity | 439 |  | 444 |  |  |
Total Liabilities and Equity | 494 |  | 488 |  |  |
Home Fashion Segment |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 4 |  | 5 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 3 |  | 3 |  |  |
Accounts receivable, net | 28 |  | 26 |  |  |
Inventories, net | 92 |  | 81 |  |  |
Property, plant and equipment, net | 53 |  | 52 |  |  |
Goodwill and intangible assets, net | 19 |  | 19 |  |  |
Other assets | 18 |  | 17 |  |  |
Total assets | 217 |  | 203 |  |  |
Accounts payable, accrued expenses and other liabilities | 43 |  | 42 |  |  |
Debt | 14 |  | 8 |  |  |
Total liabilities | 57 |  | 50 |  |  |
Equity attributable to Icahn Enterprises | 160 |  | 153 |  |  |
Total equity | 160 |  | 153 |  |  |
Total Liabilities and Equity | 217 |  | 203 |  |  |
Pharma |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 30 |  | 26 |  |  |
Accounts receivable, net | 30 |  | 27 |  |  |
Inventories, net | 22 |  | 23 |  |  |
Goodwill and intangible assets, net | 184 |  | 198 |  |  |
Other assets | 6 |  | 8 |  |  |
Total assets | 272 |  | 282 |  |  |
Accounts payable, accrued expenses and other liabilities | 55 |  | 55 |  |  |
Total liabilities | 55 |  | 55 |  |  |
Equity attributable to Icahn Enterprises | 217 |  | 227 |  |  |
Total equity | 217 |  | 227 |  |  |
Total Liabilities and Equity | 272 |  | 282 |  |  |
Holding Company |  |  |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 1,470 |  | 1,584 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 173 |  | 173 |  |  |
Related party notes receivable, net | 7 |  | 11 |  |  |
Property, plant and equipment, net | 4 |  | 4 |  |  |
Other assets | 194 |  | 224 |  |  |
Total assets | 1,848 |  | 1,996 |  |  |
Accounts payable, accrued expenses and other liabilities | 92 |  | 62 |  |  |
Debt | 4,860 |  | 4,847 |  |  |
Total liabilities | 4,952 |  | 4,909 |  |  |
Equity attributable to Icahn Enterprises | (3,104) |  | (2,913) |  |  |
Total equity | (3,104) |  | (2,913) |  |  |
Total Liabilities and Equity | $ 1,848 |  | $ 1,996 |  |  |

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