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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Accounting Policies [Line Items] |  |  |
Assets | $ 28,297 |  | $ 24,985
Liabilities | 18,715 |  | 15,727
Carrying value | 8,056 |  | 8,059
Fair value of long-term debt | 8,100 |  | 8,200
Cash held at consolidated affiliated partnerships and restricted cash | 1,134 |  | 1,612
Cash held at consolidated affiliated partnerships |  |  |
Accounting Policies [Line Items] |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 142 |  | 686
Restricted cash |  |  |
Accounting Policies [Line Items] |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 992 |  | 926
Energy Segment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 4,917 |  | 4,723
Liabilities | 3,141 |  | 2,880
Carrying value | 1,691 |  | 1,691
Cash held at consolidated affiliated partnerships and restricted cash | 7 |  | 7
Deferred revenue | 40 |  | 31
Recorded revenue | 8 | $ 6 |
Revenue, remaining performance obligation | 6 |  |
Revenue, current portion of remaining performance obligation | 3 |  |
Automotive Segment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 3,063 |  | 3,085
Liabilities | 1,505 |  | 1,531
Carrying value | 352 |  | 368
Cash held at consolidated affiliated partnerships and restricted cash | 18 |  | 20
Deferred revenue | 40 |  | 41
Recorded revenue | 6 | $ 6 |
Real Estate Segment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 494 |  | 486
Liabilities | 51 |  | 46
Carrying value | 1 |  | 1
Cash held at consolidated affiliated partnerships and restricted cash | 10 |  | 8
Food Packaging Segment |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 471 |  | 487
Liabilities | 319 |  | 333
Carrying value | 156 |  | 151
Icahn Enterprises Holdings |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 28,297 |  | 24,985
Liabilities | 18,717 |  | 15,729
Carrying value | 8,058 |  | 8,061
Cash held at consolidated affiliated partnerships and restricted cash | 1,134 |  | 1,612
Cash and cash equivalents | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 64 |  | 31
Cash held at consolidated affiliated partnerships and restricted cash | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 1,078 |  | 1,558
Investments. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 10,926 |  | 8,239
Due from brokers | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 4,234 |  | 3,437
Accounts receivable, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 15 |  | 37
Inventories, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 57 |  | 42
Property, plant and equipment, net. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 1,025 |  | 1,042
Unrealized gain on derivative contracts | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 849 |  | 785
Intangible assets, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 227 |  | 232
Other assets. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Assets | 124 |  | 107
Accounts payable. | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 22 |  | 25
Accrued expenses and other liabilities | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 151 |  | 70
Deferred tax liabilities | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 1 |  | 1
Unrealized loss on derivative contracts | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 521 |  | 622
Securities sold, not yet purchased, at fair value | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 4,863 |  | 2,521
Due to brokers | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | 1,509 |  | 1,618
Debt | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Liabilities | $ 637 |  | $ 636
Icahn Enterprises Holdings |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 99.00% |  |
Viskase | Variable Interest Entity, Primary Beneficiary |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 50.00% |  |

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