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Basis of Presentation and Summary of Significant Accounting Policies Variable Interest Entities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Line Items] |  |  |
Assets | $ 24,987 | $ 24,639 |
Liabilities | 15,730 | 13,697 |
Post-retirement benefit liability | 81 | 73 |
Debt | 8,059 | 8,192 |
Fair value of long-term debt | 8,200 | 7,600 |
Portion of inventory under LIFO method | 555 | 869 |
Accumulated other comprehensive loss | (83) | (82) |
Restricted cash | $ 1,592 | 1,151 |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.99% |  |
Icahn Enterprises G.P. |  |  |
Accounting Policies [Line Items] |  |  |
Affiliate ownership interest | 98.01% |  |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.99% |  |
Icahn Enterprises Holdings |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 99.00% |  |
Affiliate ownership interest | 99.00% |  |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.00% |  |
Icahn Enterprises Holdings LP |  |  |
Accounting Policies [Line Items] |  |  |
Affiliate ownership interest | 98.01% |  |
Cash held at consolidated affiliated partnerships [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Restricted cash | $ 686 | 86 |
Restricted cash |  |  |
Accounting Policies [Line Items] |  |  |
Restricted cash | $ 906 | 1,065 |
Variable Interest Entity, Primary Beneficiary | Viskase |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 50.00% |  |
Real Estate Segment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | $ 486 | 514 |
Liabilities | 46 | 40 |
Debt | 1 | 2 |
Restricted cash | $ 8 | 2 |
Real Estate Segment | Minimum |  |  |
Accounting Policies [Line Items] |  |  |
Lessee term | 5 years |  |
Real Estate Segment | Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Lessee term | 39 years |  |
Food Packaging Segment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | $ 485 | 517 |
Liabilities | 332 | 464 |
Debt | $ 151 | 268 |
Restricted cash |  | $ 1 |
Lessee term | 11 years 1 month 6 days | 11 years 8 months 12 days |
Food Packaging Segment | Viskase |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 79.00% | 75.00% |
Energy Segment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | $ 4,723 | $ 4,673 |
Liabilities | 2,880 | 2,375 |
Deferred revenue | 31 | 28 |
Recorded revenue | 27 | 68 | $ 34
Debt | 1,691 | $ 1,195 |
Restricted cash | $ 7 |  |
Lessee term | 3 years 1 month 6 days | 3 years 8 months 12 days |
Remaining performance obligation expected to be recognized as revenue within one year | $ 3 |  |
Remaining performance obligation for contracts with an original expected duration of more than one year | $ 6 |  |
Energy Segment | Minimum | Refineries |  |  |
Accounting Policies [Line Items] |  |  |
Turnaround Term of Plants | 4 years |  |
Energy Segment | Minimum | Nitrogen Fertilizer Plants |  |  |
Accounting Policies [Line Items] |  |  |
Turnaround Term of Plants | 2 years |  |
Energy Segment | Maximum | Refineries |  |  |
Accounting Policies [Line Items] |  |  |
Turnaround Term of Plants | 5 years |  |
Energy Segment | Maximum | Nitrogen Fertilizer Plants |  |  |
Accounting Policies [Line Items] |  |  |
Turnaround Term of Plants | 3 years |  |
Automotive Segment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | $ 3,089 | $ 3,495 |
Liabilities | 1,535 | 1,745 |
Deferred revenue | 41 | 42 |
Recorded revenue | 25 | 21 | $ 18
Debt | $ 368 | $ 405 |
Lessee term | 4 years 7 months 6 days | 5 years 2 months 12 days |
Icahn Enterprises Holdings |  |  |
Accounting Policies [Line Items] |  |  |
Assets | $ 24,987 | $ 24,639 |
Liabilities | 15,732 | 13,700 |
Debt | 8,061 | 8,195 |
Restricted cash | 1,592 | 1,151 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Cash and cash equivalents |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 31 | 42 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Cash held at consolidated affiliated partnerships and restricted cash |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 1,558 | 989 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Investments [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 8,239 | 9,207 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Due from brokers |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 3,437 | 858 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Accounts receivable, net |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 37 | 35 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Inventories, net |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 42 | 48 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Property, plant and equipment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 1,042 | 1,110 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Unrealized gain on derivative contracts |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 785 | 182 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Intangible assets, net |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 232 | 251 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Other assets [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 107 | 49 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Accounts payable |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 25 | 25 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Accrued expenses and other liabilities |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 70 | 97 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Deferred tax liability [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 1 | 1 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Unrealized loss on derivative contracts |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 622 | 1,215 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Securities sold, not yet purchased |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 2,521 | 1,190 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Due to brokers |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 1,618 | 54 |
Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary | Debt |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | $ 636 | $ 633 |

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