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Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounting policies [Line Items] |  |  |  |  |  |
Debt |  | $ 7,449 |  |  | $ 7,326 |
Fair value of long-term debt |  | 7,700 |  |  | 7,300 |
Cash held at consolidated affiliated partnerships and restricted cash |  | 613 |  |  | 2,682 |
Operating lease right-of-use asset |  | 635 |  |  |  |
Operating lease liability |  | 664 |  |  |  |
Financing lease liability |  | 93 |  |  |  |
Cash held at consolidated affiliated partnerships |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash |  | 286 |  |  | 2,648 |
Restricted cash |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Cash held at consolidated affiliated partnerships and restricted cash |  | 327 |  |  | 34 |
Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | $ (11) |  | $ (33) |  |  |
Debt |  | 1,195 |  |  | 1,170 |
Cash held at consolidated affiliated partnerships and restricted cash |  | 0 |  |  | 0 |
Deferred revenue |  | 16 |  |  | 69 |
Recognition of beginning deferred revenue |  | 68 | 34 |  |  |
Revenue, remaining performance obligation |  | 7 |  |  |  |
Revenue, current portion of remaining performance obligation |  | 1 |  |  |  |
Operating lease right-of-use asset |  | 48 |  | $ 56 |  |
Operating lease liability |  | 47 |  | 56 |  |
Financing lease right-of-use asset |  |  |  | 26 |  |
Financing lease liability |  |  |  | 23 |  |
Automotive Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Debt |  | 403 |  |  | 372 |
Cash held at consolidated affiliated partnerships and restricted cash |  | 0 |  |  | 0 |
Deferred revenue |  | 42 |  |  | 42 |
Recognition of beginning deferred revenue |  | $ 17 | 18 |  |  |
Number of leases |  | 2,300 |  |  |  |
Operating lease right-of-use asset |  | $ 521 |  | 589 |  |
Operating lease liability |  | 547 |  | 621 |  |
Financing lease right-of-use asset |  |  |  | 20 |  |
Financing lease liability |  |  |  | 22 |  |
Real Estate Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Debt |  | 2 |  |  | 2 |
Cash held at consolidated affiliated partnerships and restricted cash |  | 2 |  |  | 26 |
Food Packaging Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Debt |  | 269 |  |  | 273 |
Cash held at consolidated affiliated partnerships and restricted cash |  | 1 |  |  | 1 |
Operating lease right-of-use asset |  | 34 |  | 35 |  |
Operating lease liability |  | $ 38 |  | 39 |  |
Financing lease liability |  |  |  | 0 |  |
Other Segments |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Operating lease right-of-use asset |  |  |  | 28 |  |
Operating lease liability |  |  |  | $ 28 |  |
Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Percentage of equity ownership in operating subsidiary |  | 99.00% |  |  |  |
Debt |  | $ 7,452 |  |  | 7,330 |
Cash held at consolidated affiliated partnerships and restricted cash |  | 613 |  |  | 2,682 |
Cash and cash equivalents | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Assets of VIE's |  | 84 |  |  | 415 |
Cash held at consolidated affiliated partnerships and restricted cash | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Assets of VIE's |  | 600 |  |  | 2,648 |
Investments | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Assets of VIE's |  | 8,718 |  |  | 6,951 |
Due from brokers | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Assets of VIE's |  | 842 |  |  | 664 |
Inventories, net | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Assets of VIE's |  | 57 |  |  | 380 |
Property, plant and equipment, net |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Financing lease right-of-use asset |  | 80 |  |  | 41 |
Property, plant and equipment, net | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  | (15) |
Property, plant and equipment, net | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Assets of VIE's |  | 1,125 |  |  | 3,012 |
Deferred tax liability | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  | 18 |
Total equity | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  | 75 | $ 118
Intangible assets, net | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Assets of VIE's |  | 256 |  |  | 278 |
Other assets |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Operating lease right-of-use asset |  | 635 |  |  | 0 |
Other assets | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  | 108 |
Other assets | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Assets of VIE's |  | 345 |  |  | 930 |
Accounts payable, accrued expenses and other liabilities | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Liabilities of VIE's |  | 1,481 |  |  | 516 |
Securities sold, not yet purchased, at fair value | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Liabilities of VIE's |  | 223 |  |  | 468 |
Due to brokers | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Liabilities of VIE's |  | 114 |  |  | 141 |
Debt |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Financing lease liability |  | 93 |  |  | 52 |
Debt | Icahn Enterprises Holdings |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Liabilities of VIE's |  | $ 632 |  |  | 1,167 |
Attributable to Icahn Enterprises | Total equity | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  | $ 31 | $ 62
Attributable to Icahn Enterprises | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | (8) |  | (20) |  |  |
Income tax expense | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | (3) |  | (8) |  |  |
Cost of goods sold | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | 14 |  | 41 |  |  |
Prior period reclassification adjustment | 5 |  | 75 |  |  |
Other income, net | Energy Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Prior period reclassification adjustment | (5) |  | (75) |  |  |
Minimum | Real Estate Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Description of Lessor Leasing Arrangements, Operating Leases |  | 5 years |  |  |  |
Maximum | Real Estate Segment |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Description of Lessor Leasing Arrangements, Operating Leases |  | 39 years |  |  |  |
Discontinued operations, held for sale or disposed of by sale |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Income tax expense from discontinued operations | (37) |  | (100) |  |  |
Discontinued operations, held for sale or disposed of by sale | Federal-Mogul |  |  |  |  |  |
Accounting policies [Line Items] |  |  |  |  |  |
Income tax expense from discontinued operations | $ (28) | $ (24) | $ (69) |  |  |

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