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Basis of Presentation and Summary of Significant Accounting Policies (Details) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Operating lease right-of-use asset | $ 678 |  |  |  |
Operating lease liability | 708 |  |  |  |
Financing lease liability | 95 |  |  |  |
Fair value of long-term debt | 7,500 |  |  | $ 7,300 |
Restricted cash | 2,299 |  |  | 2,682 |
Debt | 7,392 |  |  | 7,326 |
Cash held at consolidated affiliated partnerships |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Restricted cash | 1,673 |  |  | 2,648 |
Restricted cash |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Restricted cash | 626 |  |  | 34 |
Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Operating lease right-of-use asset | 51 |  | $ 56 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  | $ (11) |  |  |
Prior period reclassification adjustment |  | (59) |  |  |
Operating lease liability | 50 |  | 56 |  |
Financing lease right-of-use asset |  |  | 26 |  |
Financing lease liability |  |  | 23 |  |
Restricted cash | 0 |  |  | 0 |
Deferred revenue | 65 |  |  | 69 |
Recognition of Deferred Revenue | 12 | 12 |  |  |
Revenue, remaining performance obligation | 10 |  |  |  |
Revenue, current portion of remaining performance obligation | 4 |  |  |  |
Debt | 1,196 |  |  | 1,170 |
Real Estate Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Restricted cash | 2 |  |  | 26 |
Debt | $ 2 |  |  | 2 |
Automotive Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Number of leases | 2,300 |  |  |  |
Operating lease right-of-use asset | $ 560 |  | 589 |  |
Operating lease liability | 591 |  | 621 |  |
Financing lease right-of-use asset |  |  | 24 |  |
Financing lease liability |  |  | 27 |  |
Restricted cash | 0 |  |  | 0 |
Deferred revenue | 41 |  |  | 42 |
Recognition of Deferred Revenue | 6 | 4 |  |  |
Debt | 405 |  |  | 372 |
Food Packaging Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Operating lease right-of-use asset | 41 |  | 42 |  |
Operating lease liability | 41 |  | 42 |  |
Financing lease right-of-use asset |  |  | 1 |  |
Financing lease liability |  |  | 1 |  |
Restricted cash | 1 |  |  | 1 |
Debt | $ 271 |  |  | 273 |
Other Segments |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Operating lease right-of-use asset |  |  | 28 |  |
Operating lease liability |  |  | $ 28 |  |
Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Percentage of equity ownership in operating subsidiary | 99.00% |  |  |  |
Restricted cash | $ 2,299 |  |  | 2,682 |
Debt | 7,396 |  |  | 7,330 |
Cash and cash equivalents | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 97 |  |  | 415 |
Cash held at consolidated affiliated partnerships and restricted cash | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 2,286 |  |  | 2,648 |
Investments | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 7,130 |  |  | 6,951 |
Due from brokers | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 1,224 |  |  | 664 |
Property, plant and equipment, net |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Financing lease right-of-use asset | 81 |  |  | 51 |
Property, plant and equipment, net | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | (15) |
Property, plant and equipment, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 1,164 |  |  | 3,012 |
Deferred tax liability | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | 18 |
Total equity | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | 75 | $ 118
Inventories, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 72 |  |  | 380 |
Intangible assets, net | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 266 |  |  | 278 |
Other assets |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Operating lease right-of-use asset | 678 |  |  | 0 |
Other assets | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | 108 |
Other assets | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Assets of VIE's | 55 |  |  | 971 |
Accounts payable, accrued expenses and other liabilities | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 851 |  |  | 534 |
Securities sold, not yet purchased, at fair value | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 447 |  |  | 468 |
Due to brokers | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | 0 |  |  | 141 |
Debt |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Financing lease liability | 95 |  |  | 54 |
Debt | Icahn Enterprises Holdings |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Liabilities of VIE's | $ 630 |  |  | 1,170 |
Attributable to Icahn Enterprises | Total equity | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | $ 31 | $ 62
Attributable to Icahn Enterprises | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  | (5) |  |  |
Cost of goods sold | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  | 14 |  |  |
Income tax expense | Energy Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income |  | $ (3) |  |  |
Minimum | Real Estate Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Description of Lessor Leasing Arrangements, Operating Leases | 5 years |  |  |  |
Maximum | Real Estate Segment |  |  |  |  |
Organization, Consolidation and Presentation of Financial Statements [Line Items] |  |  |  |  |
Description of Lessor Leasing Arrangements, Operating Leases | 39 years |  |  |  |

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