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Income Taxes Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 09, 2020 | Dec. 08, 2020 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Book basis of net assets |  | $ 3,382 | $ 5,456 |  |  |  |
Book/tax basis difference |  | (774) | (1,397) |  |  |  |
Tax basis of net assets |  | 2,608 | 4,059 |  |  |  |
Domestic income (loss) from continuing operations before taxes |  | (2,586) | (1,765) | $ 235 |  |  |
Foreign income (loss) from continuing operations before taxes |  | 2 | 26 | (12) |  |  |
Income before income tax benefit (expense) |  | (2,584) | (1,739) | 223 |  |  |
Current income tax (expense) benefit |  | 67 | (109) | (15) |  |  |
Deferred income tax (expense) benefit |  | 49 | 89 | 29 |  |  |
Income tax (expense) benefit |  | 116 | (20) | 14 |  |  |
Deferred tax assets, Property, plant and equipment |  | 17 | 17 |  |  |  |
Deferred tax asset, net operating loss |  | 996 | 791 |  |  |  |
deferred tax asset, Tax credits |  | 60 | 29 |  |  |  |
Deferred Tax Assets, Capital Loss Carryforwards |  | 358 | 155 |  |  |  |
Deferred tax assets, lease arrangements |  | 141 | 133 |  |  |  |
Deferred tax asset, Other |  | 119 | 71 |  |  |  |
Deferred tax assets, gross |  | 1,691 | 1,196 |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | (1,026) | (619) |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance |  | 665 | 577 |  |  |  |
Deferred tax liabilities, Property, plant and equipment |  | (121) | (125) |  |  |  |
Deferred tax liabilities, Intangible assets |  | (84) | (37) |  |  |  |
Deferred tax liability, Investment in partnerships |  | (657) | (652) |  |  |  |
Deferred tax liabilities, Investment in U.S. subsidiaries |  | (184) | (184) |  |  |  |
Deferred Tax Liabilities, Leases |  | (135) | (125) |  |  |  |
Deferred tax liabilities, Other |  | (46) | (61) |  |  |  |
Deferred Tax Liabilities, Gross |  | (1,227) | (1,184) |  |  |  |
Deferred tax liabilities, net of deferred tax assets |  | (562) | (607) |  |  |  |
Deferred Tax Assets, Net |  | 7 | 32 |  |  |  |
Deferred tax liability |  | 569 | 639 |  |  |  |
Increase (decrease) in deferred tax asset valuation amount |  | $ 407 |  |  |  |  |
Deferred Tax Carryforward Period |  | 5 years |  |  |  |  |
Undistributed earnings of foreign subsidiaries |  |  | 66 |  |  |  |
Additional tax due from GILTI |  | $ 1 |  |  |  |  |
Unrecognized tax benefits balance |  | 35 | 33 | 34 |  |  | $ 34
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 31 | 27 | 30 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 3 | 1 | 1 |  |  |
Income tax expense related to interest and penalties related to unrecognized tax benefits |  | 2 | 0 | (1) |  |  |
Deferred tax assets, lease arrangements |  | 141 | 133 |  |  |  |
Deferred Tax Liabilities, Leasing Arrangements |  | 135 | 125 |  |  |  |
Energy Segment |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income before income tax benefit (expense) |  | (439) | 426 | 380 |  |  |
Income tax (expense) benefit |  | 112 | (112) | (46) |  |  |
Icahn Enterprises Holdings |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Book basis of net assets |  | 3,380 | 5,453 |  |  |  |
Book/tax basis difference |  | (774) | (1,397) |  |  |  |
Tax basis of net assets |  | 2,606 | 4,056 |  |  |  |
Income before income tax benefit (expense) |  | (2,583) | (1,738) | 224 |  |  |
Income tax (expense) benefit |  | 116 | (20) | 14 |  |  |
Deferred tax liability |  | 569 | 639 |  |  |  |
American Entertainment Properties Corp. |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Deferred tax assets, Operating loss carryforwards, Subject to expiration |  |  | 2,100 |  |  |  |
American Entertainment Properties Corp. | Viskase Companies, Inc |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  | 89.00% | 79.00% |
CVR Energy |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  |  | 2 |  |  |  |
CVR Energy | Energy Segment |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Equity issued to acquire additional interest in consolidated subsidiary (number of units) | 13,699,549 |  |  |  |  |  |
CVR Refining | Energy Segment |  |  |  |  |  |  |
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 |  | 69 | (106) | (11) |  |  |
Deferred income tax (expense) benefit |  | 51 | 87 | 30 |  |  |
Foreign tax authority |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Current income tax (expense) benefit |  | (2) | (3) | (4) |  |  |
Deferred income tax (expense) benefit |  | (2) | 2 | $ (1) |  |  |
Foreign tax authority | American Entertainment Properties Corp. |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Deferred tax assets, Operating loss carryforwards, Subject to expiration |  | 11 |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration |  | 29 |  |  |  |  |
Kansas | CVR Energy |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Tax credits |  |  | $ 30 |  |  |  |
United States | Vivus |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Tax credits |  | 17 |  |  |  |  |
Operating loss carryforwards |  | $ 656 |  |  |  |  |

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