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Basis of Presentation and Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounting Policies [Line Items] |  |  |
Debt | $ 7,692 | $ 8,059 |
Fair value of long-term debt | 7,800 | 8,200 |
Restricted cash | 2,115 | 1,612 |
Portion of inventory under LIFO method | 264 | 555 |
Post-retirement benefit liability | 55 | 81 |
Accumulated other comprehensive loss | $ (74) | (80) |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.99% |  |
Icahn Enterprises G.P. |  |  |
Accounting Policies [Line Items] |  |  |
Affiliate ownership interest | 98.01% |  |
Aggregate general partner ownership interest of parent and operating subsidiary | 1.99% |  |
Icahn Enterprises Holdings |  |  |
Accounting Policies [Line Items] |  |  |
Percentage of equity ownership in operating subsidiary | 99.00% |  |
Affiliate ownership interest | 99.00% |  |
Icahn Enterprises Holdings LP |  |  |
Accounting Policies [Line Items] |  |  |
Affiliate ownership interest | 98.01% |  |
Cash held at consolidated affiliated partnerships [Member] |  |  |
Accounting Policies [Line Items] |  |  |
Restricted cash | $ 102 | 686 |
Restricted cash |  |  |
Accounting Policies [Line Items] |  |  |
Restricted cash | 2,013 | 926 |
Real Estate Segment |  |  |
Accounting Policies [Line Items] |  |  |
Debt | 1 | 1 |
Restricted cash | $ 11 | 8 |
Real Estate Segment | Minimum |  |  |
Accounting Policies [Line Items] |  |  |
Lessee term | 5 years |  |
Real Estate Segment | Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Lessee term | 39 years |  |
Food Packaging Segment |  |  |
Accounting Policies [Line Items] |  |  |
Debt | $ 155 | $ 151 |
Lessee term | 10 years 6 months | 11 years 1 month 6 days |
Energy Segment |  |  |
Accounting Policies [Line Items] |  |  |
Debt | $ 1,660 | $ 1,691 |
Restricted cash | $ 7 | $ 7 |
Lessee term | 4 years 1 month 6 days | 3 years 1 month 6 days |
Remaining performance obligation expected to be recognized as revenue within one year | $ 6 |  |
Remaining performance obligation for contracts with an original expected duration of more than one year | 10 |  |
Deferred revenue | 87 | $ 31 |
Recorded revenue | $ 30 | 27 | $ 68
Energy Segment | Minimum | Refineries |  |  |
Accounting Policies [Line Items] |  |  |
Turnaround Term of Plants | 4 years |  |
Energy Segment | Minimum | Nitrogen Fertilizer Plants |  |  |
Accounting Policies [Line Items] |  |  |
Turnaround Term of Plants | 2 years |  |
Energy Segment | Maximum | Refineries |  |  |
Accounting Policies [Line Items] |  |  |
Turnaround Term of Plants | 5 years |  |
Energy Segment | Maximum | Nitrogen Fertilizer Plants |  |  |
Accounting Policies [Line Items] |  |  |
Turnaround Term of Plants | 3 years |  |
Automotive Segment |  |  |
Accounting Policies [Line Items] |  |  |
Debt | $ 26 | 368 |
Restricted cash | $ 17 | $ 20 |
Lessee term | 4 years 10 months 24 days | 4 years 7 months 6 days |
Deferred revenue | $ 42 | $ 41 |
Recorded revenue | $ 24 | $ 25 | $ 21

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