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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Accounting policies [Line Items] |  |  |  |  |
Assets | $ 24,706 |  | $ 24,706 |  | $ 24,639
Total liabilities | 14,441 |  | 14,441 |  | 13,697
Debt | 8,162 |  | 8,162 |  | 8,192
Fair value of long-term debt | 7,900 |  | 7,900 |  | 7,600
Cash held at consolidated affiliated partnerships and restricted cash | 916 |  | 916 |  | 1,151
Operating lease right-of-use asset | 595 |  | 595 |  | 624
Operating lease liability | 616 |  | 616 |  | 647
Cash held at consolidated affiliated partnerships |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 540 |  | 540 |  | 86
Restricted cash |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash | 376 |  | 376 |  | 1,065
Energy Segment |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 4,705 |  | 4,705 |  | 4,673
Total liabilities | 2,644 |  | 2,644 |  | 2,375
Debt | 1,690 |  | 1,690 |  | 1,195
Cash held at consolidated affiliated partnerships and restricted cash | 0 |  | 0 |  | 0
Deferred revenue | 3 |  | 3 |  | 28
Recorded revenue | 21 | $ 56 | 27 | $ 68 |
Revenue, remaining performance obligation | 8 |  | 8 |  |
Revenue, current portion of remaining performance obligation | 1 |  | 1 |  |
Operating lease right-of-use asset | 42 |  | 42 |  | 48
Operating lease liability | 42 |  | 42 |  | 48
Automotive Segment |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 3,284 |  | 3,284 |  | 3,495
Total liabilities | 1,547 |  | 1,547 |  | 1,745
Debt | 366 |  | 366 |  | 405
Cash held at consolidated affiliated partnerships and restricted cash | 0 |  | 0 |  | 0
Deferred revenue | 40 |  | 40 |  | 42
Recorded revenue | 7 | $ 6 | 13 | $ 12 |
Operating lease right-of-use asset | 474 |  | 474 |  | 501
Operating lease liability | 498 |  | 498 |  | 527
Real Estate Segment |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 517 |  | 517 |  | 514
Total liabilities | 59 |  | 59 |  | 40
Debt | 2 |  | 2 |  | 2
Cash held at consolidated affiliated partnerships and restricted cash | 4 |  | 4 |  | 2
Food Packaging Segment |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 508 |  | 508 |  | 517
Total liabilities | 448 |  | 448 |  | 464
Debt | 259 |  | 259 |  | 268
Cash held at consolidated affiliated partnerships and restricted cash | 1 |  | 1 |  | 1
Operating lease right-of-use asset | 32 |  | 32 |  | 34
Operating lease liability | 36 |  | 36 |  | 38
Icahn Enterprises Holdings |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 24,706 |  | 24,706 |  | 24,639
Total liabilities | 14,444 |  | 14,444 |  | 13,700
Debt | 8,165 |  | 8,165 |  | 8,195
Cash held at consolidated affiliated partnerships and restricted cash | 916 |  | 916 |  | 1,151
Cash and cash equivalents | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 35 |  | 35 |  | 42
Cash held at consolidated affiliated partnerships and restricted cash | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 889 |  | 889 |  | 989
Investments [Member] | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 8,681 |  | 8,681 |  | 9,207
Due from brokers | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 2,152 |  | 2,152 |  | 858
Accounts receivable, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 16 |  | 16 |  | 35
Inventories, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 47 |  | 47 |  | 48
Property, plant and equipment, net [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Financing lease right-of-use asset | 71 |  | 71 |  | 77
Property, plant and equipment, net [Member] | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 1,090 |  | 1,090 |  | 1,123
Unrealized gain on derivative contracts | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 1,921 |  | 1,921 |  | 182
Intangible assets, net | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 241 |  | 241 |  | 251
Other assets [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Operating lease right-of-use asset | 595 |  | 595 |  | 624
Other assets [Member] | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Assets | 33 |  | 33 |  | 49
Accounts Payable [Member] | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Total liabilities | 24 |  | 24 |  | 25
Accrued expenses and other liabilities |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Operating lease liability | 616 |  | 616 |  | 647
Accrued expenses and other liabilities | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Total liabilities | 43 |  | 43 |  | 98
Unrealized loss on derivative contracts | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Total liabilities | 81 |  | 81 |  | 1,215
Securities sold, not yet purchased, at fair value | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Total liabilities | 459 |  | 459 |  | 1,190
Due to brokers | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Total liabilities | 2,938 |  | 2,938 |  | 54
Debt |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Financing lease liability | 86 |  | 86 |  | 93
Debt | Icahn Enterprises Holdings | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Total liabilities | $ 633 |  | $ 633 |  | $ 633
Icahn Enterprises Holdings |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 99.00% |  |
Viskase |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 78.60% |  |
Viskase | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  |  | 50.00% |  |

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