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Segment Reporting - Condensed Balance Sheets By Reporting Segment (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
ASSETS |  |  |  |  |  |
Cash and cash equivalents | $ 2,194 |  | $ 1,679 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 1,269 |  | 1,612 |  |  |
Investments | 10,903 |  | 8,913 |  |  |
Accounts receivable, net | 596 |  | 501 |  |  |
Inventories, net | 1,568 |  | 1,580 |  |  |
Property, plant and equipment, net | 4,235 |  | 4,228 |  |  |
Goodwill and intangible assets, net | 924 |  | 954 |  |  |
Other assets | 6,212 |  | 5,522 |  |  |
Assets | 27,901 |  | 24,989 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 5,580 |  | 5,151 |  |  |
Securities sold, not yet purchased, at fair value | 4,231 |  | 2,521 |  |  |
Debt | 8,065 |  | 8,059 |  |  |
Total liabilities | 17,876 |  | 15,731 |  |  |
Equity attributable to Icahn Enterprises | 3,735 |  | 3,383 |  |  |
Equity attributable to non-controlling interests | 6,290 |  | 5,875 |  |  |
Total equity | 10,025 | $ 9,582 | 9,258 | $ 10,265 | $ 9,417 | $ 10,942
Total liabilities and equity | 27,901 |  | 24,989 |  |  |
Investment Segment |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 16 |  | 14 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 1,218 |  | 1,558 |  |  |
Investments | 10,603 |  | 8,239 |  |  |
Other assets | 5,078 |  | 4,308 |  |  |
Assets | 16,915 |  | 14,119 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 2,288 |  | 2,256 |  |  |
Securities sold, not yet purchased, at fair value | 4,231 |  | 2,521 |  |  |
Total liabilities | 6,519 |  | 4,777 |  |  |
Equity attributable to Icahn Enterprises | 4,743 |  | 4,283 |  |  |
Equity attributable to non-controlling interests | 5,653 |  | 5,059 |  |  |
Total equity | 10,396 |  | 9,342 |  |  |
Total liabilities and equity | 16,915 |  | 14,119 |  |  |
Energy Segment |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 519 |  | 667 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 7 |  | 7 |  |  |
Investments | 85 |  | 253 |  |  |
Accounts receivable, net | 234 |  | 178 |  |  |
Inventories, net | 404 |  | 298 |  |  |
Property, plant and equipment, net | 2,789 |  | 2,747 |  |  |
Goodwill and intangible assets, net | 231 |  | 238 |  |  |
Other assets | 242 |  | 335 |  |  |
Assets | 4,511 |  | 4,723 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 1,548 |  | 1,189 |  |  |
Debt | 1,693 |  | 1,691 |  |  |
Total liabilities | 3,241 |  | 2,880 |  |  |
Equity attributable to Icahn Enterprises | 647 |  | 1,039 |  |  |
Equity attributable to non-controlling interests | 623 |  | 804 |  |  |
Total equity | 1,270 |  | 1,843 |  |  |
Total liabilities and equity | 4,511 |  | 4,723 |  |  |
Automotive Segment |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 53 |  | 25 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 18 |  | 20 |  |  |
Investments | 19 |  | 40 |  |  |
Accounts receivable, net | 105 |  | 109 |  |  |
Inventories, net | 939 |  | 1,080 |  |  |
Property, plant and equipment, net | 837 |  | 857 |  |  |
Goodwill and intangible assets, net | 367 |  | 372 |  |  |
Other assets | 595 |  | 582 |  |  |
Assets | 2,933 |  | 3,085 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 1,075 |  | 1,163 |  |  |
Debt | 342 |  | 368 |  |  |
Total liabilities | 1,417 |  | 1,531 |  |  |
Equity attributable to Icahn Enterprises | 1,516 |  | 1,554 |  |  |
Total equity | 1,516 |  | 1,554 |  |  |
Total liabilities and equity | 2,933 |  | 3,085 |  |  |
Food Packaging Segment |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 9 |  | 16 |  |  |
Accounts receivable, net | 93 |  | 88 |  |  |
Inventories, net | 93 |  | 89 |  |  |
Property, plant and equipment, net | 151 |  | 160 |  |  |
Goodwill and intangible assets, net | 29 |  | 31 |  |  |
Other assets | 103 |  | 103 |  |  |
Assets | 478 |  | 487 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 164 |  | 182 |  |  |
Debt | 158 |  | 151 |  |  |
Total liabilities | 322 |  | 333 |  |  |
Equity attributable to Icahn Enterprises | 142 |  | 142 |  |  |
Equity attributable to non-controlling interests | 14 |  | 12 |  |  |
Total equity | 156 |  | 154 |  |  |
Total liabilities and equity | 478 |  | 487 |  |  |
Metals Segment |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents |  |  | 1 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 2 |  | 2 |  |  |
Accounts receivable, net | 89 |  | 63 |  |  |
Inventories, net | 32 |  | 22 |  |  |
Property, plant and equipment, net | 79 |  | 82 |  |  |
Goodwill and intangible assets, net | 8 |  | 9 |  |  |
Other assets | 31 |  | 38 |  |  |
Assets | 241 |  | 217 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 74 |  | 73 |  |  |
Debt | 26 |  | 16 |  |  |
Total liabilities | 100 |  | 89 |  |  |
Equity attributable to Icahn Enterprises | 141 |  | 128 |  |  |
Total equity | 141 |  | 128 |  |  |
Total liabilities and equity | 241 |  | 217 |  |  |
Real Estate Segment |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 35 |  | 21 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 11 |  | 8 |  |  |
Investments | 15 |  | 15 |  |  |
Accounts receivable, net | 10 |  | 10 |  |  |
Property, plant and equipment, net | 310 |  | 310 |  |  |
Goodwill and intangible assets, net |  |  | 1 |  |  |
Other assets | 114 |  | 121 |  |  |
Assets | 495 |  | 486 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 52 |  | 45 |  |  |
Debt | 2 |  | 1 |  |  |
Total liabilities | 54 |  | 46 |  |  |
Equity attributable to Icahn Enterprises | 441 |  | 440 |  |  |
Total equity | 441 |  | 440 |  |  |
Total liabilities and equity | 495 |  | 486 |  |  |
Home Fashion Segment |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 4 |  | 2 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash |  |  | 6 |  |  |
Accounts receivable, net | 40 |  | 33 |  |  |
Inventories, net | 89 |  | 81 |  |  |
Property, plant and equipment, net | 62 |  | 65 |  |  |
Goodwill and intangible assets, net | 21 |  | 21 |  |  |
Other assets | 20 |  | 19 |  |  |
Assets | 236 |  | 227 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 67 |  | 65 |  |  |
Debt | 33 |  | 21 |  |  |
Total liabilities | 100 |  | 86 |  |  |
Equity attributable to Icahn Enterprises | 136 |  | 141 |  |  |
Total equity | 136 |  | 141 |  |  |
Total liabilities and equity | 236 |  | 227 |  |  |
Pharma Segment |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 9 |  | 8 |  |  |
Accounts receivable, net | 25 |  | 20 |  |  |
Inventories, net | 11 |  | 10 |  |  |
Goodwill and intangible assets, net | 268 |  | 282 |  |  |
Other assets | 4 |  | 6 |  |  |
Assets | 317 |  | 326 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 50 |  | 64 |  |  |
Total liabilities | 50 |  | 64 |  |  |
Equity attributable to Icahn Enterprises | 267 |  | 262 |  |  |
Total equity | 267 |  | 262 |  |  |
Total liabilities and equity | 317 |  | 326 |  |  |
Holding Company |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Cash and cash equivalents | 1,549 |  | 925 |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 13 |  | 11 |  |  |
Investments | 181 |  | 366 |  |  |
Property, plant and equipment, net | 7 |  | 7 |  |  |
Other assets | 25 |  | 10 |  |  |
Assets | 1,775 |  | 1,319 |  |  |
LIABILITIES AND EQUITY |  |  |  |  |  |
Accounts payable, accrued expenses and other liabilities | 262 |  | 114 |  |  |
Debt | 5,811 |  | 5,811 |  |  |
Total liabilities | 6,073 |  | 5,925 |  |  |
Equity attributable to Icahn Enterprises | (4,298) |  | (4,606) |  |  |
Total equity | (4,298) |  | (4,606) |  |  |
Total liabilities and equity | $ 1,775 |  | $ 1,319 |  |  |

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