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Income Taxes Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |  |
Book basis of net assets |  | $ 6,529 | $ 5,106 |  |
Book/tax basis difference |  | (1,940) | (450) |  |
Tax basis of net assets |  | 4,589 | 4,656 |  |
Domestic income (loss) from continuing operations before taxes |  | 290 | 1,798 | $ (2,370) |
Foreign income (loss) from continuing operations before taxes |  | (12) | 30 | (3) |
Income before income tax benefit (expense) |  | 278 | 1,828 | (2,373) |
Current income tax (expense) benefit |  | (15) | (28) | (46) |
Deferred income tax (expense) benefit |  | 19 | 557 | 134 |
Income tax benefit (expense) |  | 4 | 529 | 88 |
Deferred tax assets, Property, pland and equipment |  | 17 | 61 |  |
Deferred tax asset, net operating loss |  | 791 | 711 |  |
deferred tax asset, Tax credits |  | 46 | 71 |  |
Deferred Tax Assets, Capital Loss Carryforwards |  | 50 | 0 |  |
Deferred tax asset, Post-employment benefits, including pensions |  | 0 | 162 |  |
Deferred tax asset, Other |  | 82 | 248 |  |
Deferred tax assets, gross |  | 986 | 1,253 |  |
Deferred Tax Assets, Valuation Allowance |  | 518 | 483 |  |
Deferred Tax Assets, Net of Valuation Allowance |  | 468 | 770 |  |
Deferred tax liabilities, Property, plant and equipment |  | (129) | (235) |  |
Deferred tax liabilities, Intangible assets |  | (33) | (115) |  |
Deferred tax liability, Investment in partnerships |  | (681) | (774) |  |
Deferred tax liabilities, Investment in U.S. subsidiaries |  | (184) | (184) |  |
Deferred tax liabilities, Other |  | (80) | (119) |  |
Deferred Tax Liabilities, Gross |  | (1,107) | (1,427) |  |
Deferred tax liabilities, net of deferred tax assets |  | 639 | 657 |  |
Deferred Tax Assets, Net |  | 37 | 75 |  |
Deferred tax liability |  | 676 | $ 732 |  |
Increase (decrease) in deferred tax asset valuation amount |  | 35 |  |  |
Undistributed earnings of foreign subsidiaries |  | $ 54 |  |  |
U.S. Federal statutory corporate income tax rate |  | 21.00% | 35.00% |  |
Unrecognized tax benefits balance |  | $ 34 | $ 34 | 52 | $ 56
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 30 | 28 | 37 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 1 | 2 | 9 |
Income tax expense related to interest and penalties related to unrecognized tax benefits |  | (1) | (7) | 1 |
Icahn Enterprises Holdings |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Book basis of net assets |  | 6,557 | 5,133 |  |
Book/tax basis difference |  | (1,940) | (450) |  |
Tax basis of net assets |  | 4,617 | 4,683 |  |
Income before income tax benefit (expense) |  | 279 | 1,830 | (2,372) |
Income tax benefit (expense) |  | 4 | 529 | 88 |
Deferred tax liability |  | 676 | 732 |  |
American Entertainment Properties Corp. |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Deferred tax assets, Operating loss carryforwards, Subject to expiration |  | 2,000 |  |  |
CVR Energy |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Equity issued to acquire additional interest in consolidated subsidiary (number of units) | 13,699,549 |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  | 3 |  |  |
CVR Refining |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Common units validly tendered and not properly withdrawn | 21,625,106 |  |  |  |
Domestic tax authority |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Current income tax (expense) benefit |  | (11) | (15) | (28) |
Deferred income tax (expense) benefit |  | 20 | 544 | 131 |
Foreign tax authority |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Current income tax (expense) benefit |  | (4) | (13) | (18) |
Deferred income tax (expense) benefit |  | (1) | $ 13 | $ 3 |
Kansas | CVR Energy |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credits |  | 35 |  |  |
United States | Viskase |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 68 |  |  |
Maximum | United States | American Entertainment Properties Corp. |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2037 |  |  |
Maximum | Other Foreign countries | Viskase |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 19 |  |  |
Minimum | Kansas | CVR Energy |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2033 |  |  |
Minimum | United States | American Entertainment Properties Corp. |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2029 |  |  |
Minimum | United States | Viskase |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Dec. 31, 2024 |  |  |
Minimum | Other Foreign countries | Viskase |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 5 |  |  |

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