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Income Taxes Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |  |  |
Book basis of net assets |  | $ 5,456 | $ 6,560 |  |
Book/tax basis difference |  | (1,397) | (1,940) |  |
Tax basis of net assets |  | 4,059 | 4,620 |  |
Domestic income (loss) from continuing operations before taxes |  | (1,765) | 235 | $ 1,836 |
Foreign income (loss) from continuing operations before taxes |  | 26 | (12) | 30 |
Income before income tax benefit (expense) |  | (1,739) | 223 | 1,866 |
Current income tax (expense) benefit |  | (109) | (15) | (28) |
Deferred income tax (expense) benefit |  | 89 | 29 | 560 |
Income tax (expense) benefit |  | (20) | 14 | 532 |
Deferred tax assets, Property, pland and equipment |  | 17 | 17 |  |
Deferred tax asset, net operating loss |  | 791 | 791 |  |
deferred tax asset, Tax credits |  | 29 | 46 |  |
Deferred Tax Assets, Capital Loss Carryforwards |  | 155 | 50 |  |
Deferred tax asset, Other |  | 71 | 82 |  |
Deferred tax assets, gross |  | 1,196 | 986 |  |
Deferred Tax Assets, Valuation Allowance |  | (619) | (518) |  |
Deferred Tax Assets, Net of Valuation Allowance |  | 577 | 468 |  |
Deferred tax liabilities, Property, plant and equipment |  | (125) | (129) |  |
Deferred tax liabilities, Intangible assets |  | (37) | (33) |  |
Deferred tax liability, Investment in partnerships |  | (652) | (699) |  |
Deferred tax liabilities, Investment in U.S. subsidiaries |  | (184) | (184) |  |
Deferred tax liabilities, Other |  | (61) | (79) |  |
Deferred Tax Liabilities, Gross |  | (1,184) | (1,124) |  |
defered tax liabilities, net of deferred tax assets |  | (607) | (656) |  |
Deferred Tax Assets, Net |  | 32 | 38 |  |
Deferred tax liability |  | 639 | 694 |  |
Increase (decrease) in deferred tax asset valuation amount |  | 101 |  |  |
Undistributed earnings of foreign subsidiaries |  | 61 |  |  |
Unrecognized tax benefits balance |  | 33 | 34 | 34 | $ 52
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  | 27 | 30 | 28 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued |  | 1 | 1 | 2 |
Income tax expense related to interest and penalties related to unrecognized tax benefits |  | 0 | (1) | (7) |
Deferred tax assets, lease arrangements |  | 133 | 0 |  |
Deferred Tax Liabilities, Leasing Arrangements |  | 125 | 0 |  |
Energy Segment |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Income before income tax benefit (expense) |  | 426 | 380 | (25) |
Income tax (expense) benefit |  | (112) | (46) | 341 |
Icahn Enterprises Holdings |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Book basis of net assets |  | 5,453 | 6,588 |  |
Book/tax basis difference |  | (1,397) | (1,940) |  |
Tax basis of net assets |  | 4,056 | 4,648 |  |
Income before income tax benefit (expense) |  | (1,738) | 224 | 1,868 |
Income tax (expense) benefit |  | (20) | 14 | 532 |
Deferred tax liability |  | 639 | 694 |  |
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] |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit |  | 3 |  |  |
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 |  | (106) | (11) | (15) |
Deferred income tax (expense) benefit |  | 87 | 30 | 547 |
Foreign tax authority |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Current income tax (expense) benefit |  | (3) | (4) | (13) |
Deferred income tax (expense) benefit |  | 2 | $ (1) | $ 13 |
Kansas | CVR Energy |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax credits |  | 16 |  |  |
United States | Viskase |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 58 |  |  |
Maximum | Other Foreign countries | Viskase |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 40 |  |  |
Minimum | Other Foreign countries | Viskase |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  | $ 5 |  |  |

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